Circuit breaker with auxiliary contacts; role of auxiliary contacts
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The auxiliary contact works in tandem with the main contact to indicate the open state of the circuit breaker. In many cases, the current or voltage passing through the main contact is too high or too large to be directly used for monitoring purposes. Therefore, an auxiliary contact is required to transmit the signal instead.
Common applications include:
1. Connecting to an indicator circuit to show the open status of the circuit breaker.
2. Integrating into a blocking circuit for interlocking actions and safety protection between multiple electrical devices.
3. Connecting to a remote signal loop so that a control center can monitor the status of the local circuit breaker.
4. Being part of a fault discrimination loop to help identify the type of fault in certain situations.
There are several types of auxiliary contacts:
1. "A" contact: This contact operates in the same state as the main contact—when the main contact opens, the "A" contact also opens, and vice versa.
2. "B" contact: This contact operates in the opposite state of the main contact—when the main contact is open, the "B" contact closes, and vice versa.
3. Make-before-break contact: This type of auxiliary contact closes earlier than the main contact during closing operations, helping to suppress inrush current when the circuit breaks.
4. Alarm contact: This contact only activates when the circuit breaker fails to trip, not during normal opening. It helps determine if the trip was caused by a fault.
5. Delayed contact: This contact includes a delay mechanism and is used where a delayed signal is needed for specific applications.
The main function of an auxiliary contact is to transmit the switching signal of the circuit breaker, similar to the auxiliary contacts found in contactors.
Established in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in manufacturing a wide range of electrical components, including silver contacts, electrical contacts, double composite silver nails, riveted and soldered silver contacts, precision stampings, conductive copper posts, electrical screws, DC and AC pins, rivets, silver dots, binding posts, and more. We also produce various products made from materials like silver, copper, iron, aluminum, and non-ferrous metals. For inquiries, please contact Mr. Chen at 13728192869.
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