Patent ID: 9088156
Filing Date: 2015-07-21
Classification: H02H

Abstract:
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.