Electric switch

摘要

An electric switch is disclosed, in particular an electric circuit breaker. In at least one example embodiment, the switch includes a measuring channel for measuring an electric measured variable and is switched off when the result of a measurement reaches or exceeds a limit value. To test the mode of operation of the measuring channel, the electric measured variable is switched to a reference channel and a reference signal source is switched to the measuring channel and the reference result obtained via the measuring channel is compared with a reference setpoint. The switch is also tripped if, to test the mode of operation of the measuring channel, the electric measured variable is switched to the reference channel and the result obtained via the reference channel reaches or exceeds the limit value.

主权项

1. An electric switch, comprising:
a multi-channel measuring device including a measuring channel configured to measure an electric measured variable; a tripping device, connected to the measuring device, configured to initiate tripping of the switch when a result of a measurement of the measuring device reaches or exceeds a limit value; a reference channel; and a reference signal source, wherein to test a mode of operation of the measuring channel upon a testing device being connected to the measuring device, the electric measured variable is switched to the reference channel and the reference signal source is switched to the measuring channel, wherein the result of the measurement obtained via the measuring channel is compared with a reference setpoint, and wherein the tripping device also initiates the tripping of the switch upon the result of a measurement, obtained via the reference channel, reaching or exceeding the limit value.