The difference between solid state relay and ordinary relay
The comparison between traditional relays and solid-state relays is related to many types. The difference between electromagnetic relays and corresponding solid-state relays is explained below:

1. Structural difference: The electromagnetic relay works by virtue of the attraction force between the electromagnet core and the armature caused by the circuit in the input circuit; the solid state relay uses electronic components to perform its function without mechanical moving parts, and the input and output are isolated.
2. Difference in working mode: Electromagnetic relay uses the principle of electromagnetic induction to adjust the circuit on and off by the power of electromagnet. Therefore, when DC is connected to the coil, the contacts can pass AC and DC; solid state relays rely on semiconductor devices and electronic components The electrical, magnetic, and optical characteristics of this product can complete its isolation and relay switching functions. Therefore, it is divided into DC input-AC output, DC input-branch output, AC input-AC output, and AC input-DC output.
3. Differences in working conditions: electromagnetic relays turn on and off the circuit with the help of the suction force caused by the armature. Therefore, the response is slow, noisy, and life is limited; solid state relays have fast response, no noise in operation, and long life.
4. Operating environment: In the basic relationship of temperature, humidity, atmospheric pressure (altitude), sand and dust pollution, chemical gas and electromagnetic interference, electromagnetic relays are generally not comparable to solid state relays.
5. Electrical performance difference: Electromagnetic relay is equivalent to the corresponding solid-state relay. The former is simple to drive, but has large power consumption, good isolation, and good short-term overload tolerance. It is not as good as the latter when adjusting large current and high power. The adjustment response is on the verge of When the circuit is complicated, the life span is not as long as the latter.

Introduction to solid state relays
The solid state relay (hereinafter abbreviated as "SSR") is a new type of non-contact switching device composed of solid electronic components. It relies on the switching characteristics of electronic components (such as switching transistors, triacs and other semiconductor devices). But it is the purpose of making and breaking the circuit without contact and spark, so it is called "non-contact switch". A solid state relay is a four-terminal active device, two of which are input adjustment terminals, and the other two terminals are output controlled terminals. It has both amplifying drive response and isolation effects, which is very suitable for driving high power The switch-type actuator is more reliable than the electromagnetic relay, and has no contact, long life, fast speed, and less interference to the outside world. It has been widely used.
Introduction to traditional relays
The GRT508FA CQC CERTIFICATION SINGLE PHASE 80A LATCHING RELAY is an electrical regulating device, which is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the input quantity (excitation quantity) changes to the prescribed requirements. It has an interactive connection between the regulating system (also called the input loop) and the regulated system (also called the output loop). Generally used in automated regulation circuits, it is actually an "automatic switch" that uses a small current to adjust a large current operation. Therefore, it plays the role of automatic adjustment, safety guarantee, and conversion circuit in the circuit.

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1. The task of relay protection
In order to ensure the safe operation of the power supply and distribution system and avoid the impact of overcurrent caused by overload and short circuit on the system, different types of overcurrent protection devices should be installed in the power supply and distribution system. Commonly used over-current protection devices include fuse protection, low-voltage circuit breaker protection and latching relay protection. Among them, relay protection is widely used in high-voltage power supply and distribution systems. It has many protection functions and is the basis for realizing power supply and distribution automation.
The relay protection device refers to an automatic device that can reflect the fault or abnormal working state of the electrical equipment in the power supply and distribution system, and can act on the circuit breaker to trip or start the signal device to send out a forecast signal.

The main tasks of relay protection are as follows:
(1) Automatically, quickly and selectively remove faulty components from the power supply and distribution system, so that other non-faulty parts can quickly resume normal power supply;
(2) It can correctly reflect the abnormal operation status of electrical equipment and send out a forecast signal so that the operator can take measures to restore the normal operation of electrical equipment;
(3) Cooperate with automatic devices of the power supply and distribution system (such as automatic reclosing devices, automatic backup power input devices, etc.) to improve the operational reliability of the power supply system.
The relay protection of the building power supply and distribution system is simple, effective, reliable, and has strong anti-interference ability.

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