PROTACT Einschraubkontakte
Der innovative Klingeltaster von Grothe mit Edelmetall-Schaltkontakten und zeitsparender Verdrahtungstechnik ist zum Einbau in Türstationen oder für die industrielle Anwendungen geeignet.
PROTACT 510 AL Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 310 AL Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 380 KS Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 260 CR Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 102 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 3 !
PROTACT 110 AL Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 370 NI Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 140 GO Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 681 KS Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 360 CR Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 371 NI Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 105 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 3 !
PROTACT 381 KS Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 100 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 3 !
PROTACT 450 VA Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 680 KS Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 410 AL Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 150 VA Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 420 AL-KS Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 650 VA Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 550 VA Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 340 GO Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 210 AL Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 101 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 3 !
PROTACT 220 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for low currents in the mA range.
PROTACT 240 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for low currents in the mA range.
PROTACT 230 LED Quick installation without screwing! A bell button with LED lighting of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for low currents in the mA range.
PROTACT 150 V4A Quick Installation without Screws! A high-quality doorbell button equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-resistant and made of a silver alloy with a gold plating. The snap disk provides tactile feedback, and the contact bounce times are extremely short, making this button ideal for use in bus intercom systems. For quick installation, this button features screwless special terminals. These terminals are also excellent for looping through wiring and can be used for solid wires with a diameter of up to 0.8 mm. The installation is tool-free thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this button is extremely durable (min. 100,000 cycles). Note: At higher currents, the gold surface of the switching contacts dissolves due to physical reasons. This is not a quality defect but merely means that the doorbell button can no longer be used for small currents in the mA range afterwards. The product is only available in a pack of 5 (PU)!
PROTACT 710 AL Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !
PROTACT 750 V4A Quick Installation without Screws! A high-quality doorbell button equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-resistant and made of a silver alloy with a gold plating. The snap disk provides tactile feedback, and the contact bounce times are extremely short, making this button ideal for use in bus intercom systems. For quick installation, this button features screwless special terminals. These terminals are also excellent for looping through wiring and can be used for solid wires with a diameter of up to 0.8 mm. The installation is tool-free thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this button is extremely durable (min. 100,000 cycles). Note: At higher currents, the gold surface of the switching contacts may wear off due to physical reasons. This is not a quality defect but simply means that the doorbell button can no longer be used for small currents in the mA range afterwards. The product is only available in a pack of 5 (PU)!
PROTACT 750 VA Quick installation without screwing! A bell button of the highest quality, equipped with precious metal switching contacts and a modern design. The switching contacts are corrosion-free and consist of a silver alloy with a gold coating. The snap-action disc provides tactile feedback and the bounce times are extremely short, making this push-button ideal for use in bus intercom systems. This push-button has special screwless terminals for quick installation. These terminals are also ideal for through-wiring and can be used for rigid wires with a diameter of up to 0.8 mm. They can be assembled without tools thanks to a handy knurled nut. Due to the high-quality materials and surface coatings, this push-button is extremely durable. (min. 100,000 cycles) Note: At higher currents, the gold surface of the switching contacts dissolves for physical reasons. This is not a quality defect, but simply means that the bell button can no longer be used for small currents in the mA range. Product is only available in a pack of 5 !