Thermal relays are protective elect...
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The purpose of selecting a motor pr...
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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, an...
19
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 sma...
16
Circuit breakers are generally composed of contact system, arc extinguishing system, operating mechanism, trip unit, shell and so on.
15
There are many types of relays, mainly electromagnetic relays, thermal relays and time relays.
14
The influence of various conditions on the reliability of the relay
13
Usually, the same text symbols are marked next to the contacts and coils of the same relay, and the contact groups are numbered.
12
In order to ensure the normal use of the relay, it is necessary to test the relay.
10
The main product technical parameters of the relay are rated working voltage, DC resistance, pull-in current, release current, contact switching voltage and current.
09
It plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.
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