How to measure the quality of circuit board relays？Measure with a multimeter. You can measure the resistance of the relay coil with a multimeter r×10ω to determine whether there is an open circuit in the coil. The resistance of the relay coil is closely related to its working voltage and current, and its working voltage and current can be calculated from the resistance of the coil.
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Role of the relay:Relays use a small current to control a large current for automatic adjustment, safety protection, and conversion circuits. In order to allow more friends to understand the related problems of relays, here is a popular science by relay manufacturers.
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If the resistance of circuit board relay is large or unstable, it means that the contact is poor; the resistance of the normally open contact and the moving point is infinite.
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Thermal relays are protective electrical appliances used for overload protection of motors or other electrical equipment and electrical circuits.
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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 th...
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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...
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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 sma...
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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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