Signal relays are commonly-used devices in automatic control system. It is used to connect and disconnect the circuit, issue control commands and reflect the state of the equipment, so as to constitute the automatic control and remote control circuit. Signal relays have the advantages of fast operation, stable operation, long service life and small size. They are widely used in power protection, automation, motion, remote control, measurement and communication devices. Signal relay is mainly consisted of iron core, coil, armature, contact reed.
