Is controlled by the circuit breaker auxiliary circuitry. In the main control room shall be provided to the control panel sends a control switch or button closing, opening command, the actuator should execute a command on the circuit breaker (i.e. closing, opening coil). Between the control switches and the actuator are connected via a control cable.
Complete closing the circuit breaker, opening the electrical circuit referred to as a task control circuit. Power control circuit according to the kind of operation can be divided into two kinds of DC operation and AC operation; divided by wiring and equipment employed, the strong and weak control two electrically controlled.
A lot of circuit breaker, actuator (operation) mechanism is also varied, so that the control circuit, there are many types. However, their basic requirements are the same.
(1). Capable of manual closing, opening, can be achieved by a relay with automatic means for automatically closing, opening. After closing, the opening operation is completed, shall be automatically cut off, sub-gate circuit, so as not to burn out the coil.
(2). Can indicate breaker closing, opening position state. When the circuit breaker closing position, a red traffic light; in the OFF position, a bright green light. Flash represents automatically closing, opening state. The control circuit should have fuse protection.
(3). To monitor the integrity of the control and power circuits. Anticreep locking device
(4). Having a mechanical or electrical.
(5). Wiring to be simple and reliable.
(1): Manual, automatic control circuit. FIG 1 is a manual, automatic circuit breakers 1101 together, opening the circuit. FIG controls switch SA, since it has complex mechanism, i.e., the end of the circuit breaker operating handle is automatically returned to its original intermediate position.
(2): QF2 and QE, respectively opening and closing coil winding of the electromagnetic actuator, KM for the closing contact, QF1 and QF4 is an auxiliary contact of the circuit breaker QF, IKAU rl is normally open movable contact means, KPo outlet protective relay is normally open contact.