POWER SUPPLY SWITCHING DEVICE FOR RELAY WITH ENERGY ACCUMULATING TRIP FUNCTION

摘要

PURPOSE:To provide a power supply switching device capable of performing the switching to a test power supply or the switching back to a normal power supply without removing a power source feed line or operating a change-over switch at test of a relay with energy accumulating trip function. CONSTITUTION:A power supply switching device has a normal power supply input part 11a and a test power supply input part 11b, and when an input is given to the test power supply input part 11b, a relay 11c is operated by the input to switch a power circuit to the test power supply input part 11b. When the input of the test power supply input part 11b is lost, the power circuit is switched back to the normal power supply input part 11a after the lapse of a fixed time by a delay circuit 11d connected to the relay 11c.