Conventional plastic-case circuit breakers can be classified

What is a moulded case Circuit Breaker? It is a circuit breaker that uses a plastic shell as protection, referred to as a plastic-case circuit breaker, also known as an air switch. Applicable to:

1. Altitude 2000m and below;

2. The ambient medium temperature is not higher than +40 ° C (+45 ° C for Marine products) and not lower than -5 ° C;

3. Can withstand the influence of humid air;

4. Resistant to the effects of salt spray and oil spray;

5. The maximum tilt is ±25.5°;

6. Can work reliably when subjected to normal vibration of the ship;

7. Can work reliably under earthquake conditions (4g);

8. In the medium without explosion danger, there is no place where there is enough to corrode the metal and destroy the insulation gas and conductive dust;

9. Where there is no rain or snow.
The role of the moulded case circuit breaker is to replace the fuse and the new products derived from the knife switch, no matter how the product is improved and changed, under normal circumstances, it has a six-link operating mechanism and no fly-arc function, which is the most mainstream air switch circuit breaker on the market. Because the knife switch does not have a protective function, the circuit breaker has become the preferred product.
Tessie Electrical plastic-case Circuit Breakers are divided into three types according to the number of product poles: single pole (below 63A), three poles, four poles. The type of neutral pole (N pole) in the quadrupole product can be divided into the following four types:
Type A: N is not installed overcurrent release and N pole is always connected, not combined with other three poles.
Type B: N is not installed overcurrent release and the N pole is combined with other three stages; N polar no combination after parting).
Type C: the N pole is installed with the overcurrent release device and the N stage is combined with the other three poles; N pole first combined and then divided).
Type D: the N pole is installed with the overcurrent release device and the N pole is always connected, not combined with other three poles;
Tessie electrical circuit breakers can be divided into (levels) according to rated current A:

-63 is 6, 10, 16, 20, 25, 32, 40, 50, 63A level 9 (6A specification without overload protection).
-100 is 10, 16, 20, 25, 32, 40, 50, 63, 80, 100A; S-3VI3-160 is a 100, 125, 140, 160A stage.
The -250 is a class of 100, 125, 140, 160, 180, 200, 225, and 250A.
The -400 is rated 225, 250, 315, 350, and 400A.
-630 is a class of 400, 500, and 630A.
The -800 is three levels 630, 700, and 800A.
-1250 is class 1000 and 1250A.
According to the wiring method, it can be divided into three types: front-board wiring, back-board wiring and plug-in.
According to the overcurrent release type can be divided into: thermodynamic-electromagnetic (compound) type, electromagnetic (instantaneous) type two.
The structure of the moulded case circuit breaker is composed of an operating mechanism, a contact, a protection device (various release devices), an arc extinguishing system, etc. The main contact of the moulded case circuit breaker is manually operated or electrically closed. After the main contact is closed, the free trip mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected to the main circuit in series, and the coil of the undervoltage release is connected to the power supply in parallel. When the circuit occurs short circuit or serious overload, the armature of the overcurrent trip device draws, making the free trip mechanism operate, and the main contact disconnects the main circuit. When the circuit is overloaded, the heat element of the thermal trip device heats up to bend the bimetal sheet and push the free trip mechanism to act. When the circuit is under voltage, the armature of the undervoltage releaser is released. Also allows the free trip mechanism to operate. Shunt trip is used as a remote control, in normal operation, the coil is powered off, in the need of distance control, press the start button, make the coil power, armature drive free trip mechanism action, make the main contact disconnected.