The purpose of selecting a motor protection device is to enable the motor to give full play to its overload capacity, avoid damage, and improve the reliability of the electric drive system and the continuity of production.
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In addition to the general protection function, it also has functions such as self-start, communication start and close, undercurrent, overvoltage, undervoltage, three-phase current imbalance, and self-start for users to choose.
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The working principle of relay and contactor is the same. The main difference is that the main contact of the contactor can withstand large current, while the relay contact can only withstand small current. Both relays and contactors are electromagnetic switching appliances, but the former belongs to switching appliances working in the control loop, and the latter belongs to switching appliances working in the main loop.
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Circuit breakers are generally composed of contact system, arc extinguishing system, operating mechanism, trip unit, shell and so on.
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There are many types of relays, mainly electromagnetic relays, thermal relays and time relays.
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The influence of various conditions on the reliability of the relay
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Usually, the same text symbols are marked next to the contacts and coils of the same relay, and the contact groups are numbered.
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In order to ensure the normal use of the relay, it is necessary to test the relay.
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The main product technical parameters of the relay are rated working voltage, DC resistance, pull-in current, release current, contact switching voltage and current.
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It plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.
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Three simple ways to judge the quality of various relays.
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The function of the motor protector is to provide comprehensive protection and control to the motor
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