What is the signal relay, which differs from the general intermediate relay
General circuit is often divided into two parts of the main circuit and the control circuit, the relay is mainly used for the control circuit, the contactor is mainly used for the main circuit; through the relay can be used to control all the way to control the signal or another signal function, complete start, stop , Linkage and other control, the main control object is the contactor; contactor contact is relatively large, carrying capacity, through it to achieve weak to strong electric control, control object is the electrical.
Intermediate relay is to increase the line in the open and close contacts ~ and the principle of the signal relay is to receive the impact of the relay issued by the impact of current action, so that the light plate or buzzer or bell rang ~ ~ he has a variety of models. Signal relay is generally used for monitoring and protection, in the distribution of high voltage cabinet secondary protection circuit on the application of more. For example: transformer oil temperature exceeds 85 degrees, temperature monitoring indicator has a normally open contact closure, the contact The signal relay is actuated, the "light" is turned off, and the high voltage switch is disconnected and the load of the transformer is removed to protect the transformer, but the signal relay is connected to the signal relay. Signal relay is also divided into many kinds, some directly is the buzzer flash as the alarm signal. Intermediate relay is a relay, not because of the "middle" of the two words and feel strange, and its principle and AC contactor, are fixed by the core, moving core, spring, moving contact, static contact, coil, Wiring terminals and housing. The coil is energized and the movable iron is actuated under the action of electromagnetic force, and the movable contact is moved so that the normally closed contact is separated and the normally open contact is closed; the coil is de-energized and the movable iron core is moved under the action of the spring Reset.
With the timer on the relay coil control, is the time relay.
Common intermediate relays also have main contacts and auxiliary contacts, the main contact generally has four groups, auxiliary contact has two groups. Compared with the contactor, its main contact is small, low carrying capacity, mainly used to transfer control signals.
