Safety relays, as the name implies, are relays that can make regular actions when a safety accident occurs. They are called safety relays, not relays that do not cause safety accidents. It is mainly composed of a combination of a relay and a circuit. It has a forced-guided contact structure and ensures safety in the event of a contact fusion. The following small series introduces the working principle of the safety relay and the role of the safety relay. Safety relay works Safety relays generally consist of iron cores, coils, armature, contact reeds, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil to generate an electromagnetic effect, and the armature will absorb the pulling force of the return Spring to the core under the action of the electromagnetic force to attract the armature. The movable contact and the stationary contact (normally open contact) are attracted. When the coil is de-energized, the electromagnetic suction also disappears, and the armature returns to its original position at the reaction force of the spring, causing the movable contact to pull in contact with the original stationary contact (normally closed contact). This sucks and releases so as to achieve the purpose of turning on and off in the circuit. For the relay's "normally open, normally closed" contacts, this can be distinguished by the fact that the relay coil is in the open state when the relay coil is not energized, and is called the "normally open contact"; the static contact in the on state is called It is a "normally closed contact". Relay main product technical parameters 1, rated operating voltage It refers to the voltage required by the coil when the relay is operating normally. Depending on the model of the relay, it can be AC ​​voltage or DC voltage. 2, DC resistance (coil impedance) Refers to the DC resistance of the coil in the relay, which can be measured by a universal meter. 3, suction current It is the minimum current that the relay can generate a pull-in action. In normal use, the given current must be slightly larger than the pull-in current so that the relay can work stably. The working voltage applied to the coil should not exceed 1.5 times the rated operating voltage, otherwise it will generate a large current and burn the coil. 4, release the current Refers to the maximum current generated by the relay to release the action. When the current in the relay pull-in state decreases to a certain degree, the relay will return to the unenergized release state. The current at this time is much less than the pull-in current. 5, contact switching voltage and current (contact capacity) Refers to the voltage and current that the relay allows to load. It determines that the relay can control the magnitude of the voltage and current and must not exceed this value during use, otherwise it is easy to damage the relay contacts. The role of the safety relay 1, to expand the scope of control. For example, when the multi-contact relay control signal reaches a certain value, the multi-circuit may be switched, disconnected, and connected at the same time according to the different forms of the contact group. 2, zoom in. For example, sensitive relays, intermediate relays, etc., can control very large power circuits with a very small amount of control. 3, integrated signal. For example, when a plurality of control signals are input to a multi-winding relay in a prescribed form, after a comparison and synthesis, a predetermined control effect is achieved. 4, automatic, remote control, monitoring. For example, relays on an automatic device, together with other electrical appliances, can form a program control circuit for automated operation. Editor's summary: The working principle of the safety relay and the role of the safety relay are introduced here, and we hope to help everyone. If you want to know more about yourself, you can follow the information on this site. Safety Relay Relay Switch Safety Relay Operating Principle
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