What is a plastic-case circuit breaker? Plastic case is called a protective circuit breaker, or plastic case circuit breaker for short, also known as an air switch. Application elephants.

1. up to 2000 m above sea level.

2. Ambient medium temperature not lower than +40 (+45 for marine products) and -5.

3. Can withstand the effects of humid air.

4. Able to withstand the effects of salt and oil mist.

5. Maximum slope of 25.5.

6. Able to work stably during normal vibration of the ship.

7. Can work stably when earthquakes occur (4g).

8. Where there is no danger of explosion in a medium free from insulating gases and conductive dust sufficient to corrode metals.

9. in areas free from rain and snow.

The role of the moulded case circuit breaker is a new product derived to replace fuses and brake switches, regardless of the improvements and variations of the product, which generally have a six-link operating mechanism and a flying arc function. These are the features required for the most mainstream air switch circuit breakers on the market today. Knife switches have no protection function, so circuit breakers are the product of choice.

Electric mode circuit breakers are divided into single pole (up to 63A), three pole and four pole depending on the number of poles in the product. Among the four-pole products, the neutral pole (n-pole) styles can be divided into four types as follows.

Type A: N-pole is not fitted with an overcurrent trip and the n-poles are always connected to each other and are not split with the other 3 poles.

Type b: N-pole is not fitted with an overcurrent trip, the N-pole is divided with the other 3 classes. n-drama has no back of the head).

Type C: N pole fitted with overcurrent tripper, N grade divided with the other 3 poles. n pole is first closed and then divided).

Type d: N-pole fitted with an overcurrent tripper. n-pole is always connected and will not be separated from the other 3 poles.

The structure of a moulded case circuit breaker consists of a working mechanism, contacts, protection devices (various tripping), arc extinguishing systems, etc. The main contacts of the moulded case circuit breaker are closed by manual operation or drive. After the main contact is closed, a free separation mechanism locks the main contact in the closed position. The coil of the overcurrent trip and the thermal component of the thermal tripper are connected to the main circuit and the coil of the low voltage trip is connected in parallel to the power supply. If a short circuit or severe overload occurs in the circuit, the armature of the overcurrent tripper will engage, the free tripping mechanism will operate and the main contacts will cut the main circuit. When the circuit is overloaded, the thermal element of the thermal tripper thermally bends the bimetal and pushes the free tripping mechanism into motion. When the circuit voltage is insufficient, the armature of the low voltage dehydrator is released. It also makes the movement of the free deduction mechanism possible. The actuator is used for remote control, the coil is disconnected during normal operation, the start button is pressed to power the coil when distance control is required and the armature drives the free tripping mechanism to separate the main contacts. (William Shakespeare, Northern Exposure (American TV series), Armature, Armature, Armature, Armature, Armature)