ABB 1SNA166741R0400

Opened type contacts for measurement and calibration applications. Break before make principle: –– The connection is made thanks to the lid: the removing of the lid opens the circuit. So the device is isolated from power supply to be tested. –– The circuit is closed only when the lid is reinstalled. –– By convention, grey coding is for voltage circuits blue coding is for polarity circuits and orange coding is for trip circuits.