Trouble supervisory relay in twinkling of an eye

The utility model provides a trouble supervisory relay in twinkling of an eye, the model is equipped with light emitting diode lamp for MY4NJ-24V's supervisory relay is inside and the coil is parallelly connected, and the miniature button on the shell is parallelly connected with the self-insurance contact, and wire tip and the series connection of coil positive terminal are drawn forth to the self-insurance contact, and the wire tip is drawn forth to the other end has the test of red instrument to use the alligator clip, and coil negtive terminal draws forth the wire tip has the test of blue instrument to use the alligator clip, in keeping watch on control circuit, DC24V power input AC220V alternating current, output DC24V direct current, the test of red instrument is connected on the monitoring point with the alligator clip, the monitoring point be + 12V to between the DC24V power, the test of blue instrument is connected on power negtive terminal with the alligator clip, starts miniature button, the automatic actuation of inside self-insurance contact, the monitoring point to between the DC24V power + the 12V power is normal, relay release separately the monitoring point to the DC24V power within a definite time + existence of 12V power cuts off the power supply in the twinkling of an eye.