brief introduction： Relay communication: communication relay coil is shorter, and the wire diameter is coarse, mainly because the coil is connected to alternating current (ac), reactance is bigger, wire diameter thick can reduce the internal resistance, reduce the heat, the other coil electromagnetic force due to alternating current (ac) through zero will reduce, and not firm, produce vibration phenomenon, so in part on the surface of the magnet and short circuit loop, the magnetic field changes, when short circuit

Alternating Switching Relay

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