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I put together a simple demonstration circuit to clearly show how the contacts of a modular switch from Hager switch: SFT440 is a four-pole switch with a width of 4 modules and SFT240 is a two-pole switch with a width of 2 modules. Well, at the same time, I will tell you a little about the range and technical characteristics of such Hager switches, which are presented in the product catalog of 20/21. How do modular switches from Hager work and what can they be used for. View the Hager catalog: https://www.hagersystems.ru/upload/ha... https://vk.com/ehlektrik - I recommend the #1 community on electrical engineering in VKontakte! https://vk.com/electron.kolomna - GOST+ team Electrical installation services in Moscow and the region Forum: http://ceshka.ru/forum/ Subscribe to the video channel: http://www.youtube.com/user/ceshkaru?... Video channels of my colleagues and friends: Sergey Panagushin- / @pan1703 Electrician from the USA- / @gruntled2001