KS 3-2010
Page 18
7.2.3.2 Connect a test power supply to the terminals (or leads) of the shunt trip release device.
WARNING—High Voltage. Do not touch switch or test leads while voltage is applied.
7.2.3.3 Operate the switch to the ON position.
7.2.3.4 Set the power supply voltage to 75% of the rated voltage of the shunt trip and energize. The
switch should open. If the switch with shunt trip release is used in a ground fault relay system,
use 55% of the rated voltage instead of 75% of the rated voltage.
CAUTION—If the switch does not open within 1 to 2 seconds, turn off the test power supply to prevent
possible damage to the shunt trip release coil.
7.2.3.5 When the test is completed, turn off the test power supply, disconnect it from the shunt trip
release device terminals (or leads), and reconnect the control circuit wires to the shunt trip
release device terminals (or leads). If an under-voltage trip release device was connected
during the test, turn off the test power supply, disconnect the test power supply wires, and
reconnect the control circuit wires to the under-voltage release device.
7.2.4 Results
The switch should open when the power supply to the shunt trip release is turned on. If the switch does
not open, check the connections and repeat the test. If the switch still does not open, replace the shunt
trip release, if replaceable. If it is not possible to replace the shunt trip release, the switch should be
replaced.
7.2.5 Reinstallation Procedure
If the switch needs to be reinstalled or replaced, follow the safety installation procedures given in 2.3 and
the manufacturer’s instructions.
7.3 Electrical Operator Tests
Figure 8
Sample Electrical Operator / Switch Assembly
© Copyright 2010 by the National Electrical Manufacturers Association.
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