brief introduction： Relay is a common device in automatic control system, it is used to connect and disconnect the circuit, to issue control commands and reflect the state of equipment, to constitute automatic control and remote control circuit.Relays are used in all fields of automatic control.The relay widely used in railway signal technology, called signal relay (in the signal system, can be referred to as relay), is an important part of railway signal.It plays an important role no matter as the core component o

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