The electronically controlled pulse switches ISS 1 and ISS U1 can be used without any problems in places where conventional electromechanical impulse relays are perceived as annoyingly loud due to their very quiet switching behavior. The flush-mounted version ISS U1 (230V AC) is also suitable for easy retrofitting of existing systems or for renovating old buildings and can be used in switch or junction boxes due to its small dimensions. Relay contacts 1 NO contact potential-free 10A / 250V AC, dimensions: 43x43x18.5mm