The Role, Classification, Technical Parameters and Troubleshooting of Auxiliary Switches for Vacuum Circuit Breaker

The auxiliary switch is a part of the main switch, which is configured in high-voltage or medium-voltage circuit breakers, isolating switches and other power equipment as the opening, closing, signal control and interlock protection of the secondary control circuit. It can also be used as a combination switch and Changeover switch is used. The auxiliary switch has the word "auxiliary" in its name because it is not an independent switch. It is a carrier for the realization of auxiliary breaking, switching, and interlocking functions in the control system.

Auxiliary switch refers to a switch that contains one or several control (or) auxiliary contacts that are mechanically operated by a switch device. The circuit breaker relies on itself to drive the closing and breaking of auxiliary contacts (contacts) to change the opening and closing positions. To connect the circuit breaker mechanism closing and tripping control circuit and the audio signal circuit, to achieve the purpose of breaking or closing the circuit of the circuit breaker, and can correctly send out the audio signal, start the device and protect the locking circuit, etc. When the auxiliary contact of the circuit breaker is used in the same circuit for closing and tripping, there should be a delay.

Auxiliary switch is an accessory of operating mechanism used for remote automatic opening and closing of circuit breakers. The electric operating mechanism has two types: motor operating mechanism and electromagnet operating mechanism. The motor operating mechanism is of molded case circuit breaker shell level. Circuit breakers with rated currents of 400A and above, electromagnet operating mechanisms are suitable for circuit breakers with rated currents of 225A and below, ( contactors with electromagnet operating mechanisms with rated currents of 400A and above , whether it is electromagnets) Or electric motors, their pull-in and rotation directions are the same, only the position of the cam inside the electric operating mechanism to achieve the closing and opening, the circuit breaker is operated by the electric mechanism, at 85% -110% of the rated control voltage Under any voltage between the time, the circuit breaker should be able to ensure reliable closing.

The auxiliary switch is suitable for molded case circuit breakers . The cover of the circuit breaker is equipped with a mechanism to rotate the operating handle. The shaft of the handle is installed in its mechanism matching hole. The other end of the shaft passes through the door hole of the drawer cabinet. The handle of the rotary handle is installed the shaft head exposed above the door of the complete set of equipment, the round or square seat of the handle is fixed on the door with screws. This installation enables the operator to turn the handle clockwise or counterclockwise outside the door to ensure the open circuit the closing or opening of the device. Rotating the handle at the same time can ensure that the cabinet door cannot be opened when the circuit breaker is closed; the door of the switch board can only be opened when the handle is opened or re-buckled. In an emergency, when the circuit breaker is "closed" and the door needs to be opened, press the red release button on the side of the rotating handle seat.

There are many types of auxiliary switches.

According to the number of opening and closing groups of the contacts: five open (50), four open and one closed (41), three open and two closed (32), two open and three closed (23), one open and four closed (14) and five There are six kinds of closed (05);

According to the different terminal types, it is divided into two types: screw crimping type (Y) and plug-in type (C);

According to the structure of the push rod, it is divided into two types: buffer (H) and connection (L);

According to the specifications of the shell, it is divided into two types: high body (G) and low body (D). And other forms of classification.

technical parameter

Common malfunctions

If the auxiliary contact is not energized, it is often caused by the moving contact bridge being stuck or falling off, it should be reinstalled. If the drive rod of the auxiliary switch is broken or the roller falls off, the drive rod and roller should be replaced or the auxiliary switch should be replaced.

Joyelectric International is a professional China auxiliary switch distributor and agent among those well-known such manufacturers and suppliers, welcome to order auxiliary switch products from our factory and company. Auxiliary Switch F10-□II/W2 and FK10 series auxiliary switch Product code:ZB-400，ZB-400A，ZB-400B，ZB-500.

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