what is a molded case circuit breaker?
what is a molded case circuit breaker?
1. what is a molded case circuit breaker:
1. the full name of plastic case circuit breaker is "plastic case switchgear", commonly known as "universal transfer switch".
2. plastic case switchgear, referred to as "plastic case circuit breaker".
3. ""plastic shell switchgear" refers to a closed metal or non-metallic shell whose structure is mainly composed of insulating materials, conductive materials and arc extinguishing materials, serving as primary and secondary circuit electrical appliances.
2. the main features of the "universal transfer switch" are as follows:
1. the structure is simple and easy to use. it uses a contact system to realize the control functions of turning on, carrying and cutting off the power supply;
2. has a variety of protection functions. it has various protection functions such as short circuit protection, overload protection and voltage loss protection;
3. flexible and reliable operation. its operation does not require human effort, just close or open the knife gate to work;
4. beautiful appearance. its appearance design is novel and reasonable, and meets the styling requirements of industrial products;
5. prices are low and reasonable.
（1）because it is assembled using discrete components, it is small in size;
（2）due to the use of new heat dissipation materials and sealing process technology, the temperature rise of the product is low;
（3）due to the use of new insulation materials and arc extinguishing devices, the residual voltage of the product is reduced;
（4）due to the use of electronic devices and microcomputer technology, the product is more intelligent;
（5）due to the extensive use of new materials and new components, costs have been greatly reduced.
3. "universal transfer switch"
the main technical parameters are as follows:
1、rated current: 10 ~400a。
2、voltage: 380 v、690v。
3、frequency: 50 hz。
4、dynamic thermal stability: 0.2%.
5、mechanical life: 30 years.
6、electrical life: 100 million times.
7、ambient temperature: -45 °C40°C。
8、relative humidity: 5% ~95%。
9、anti-pollution level: level 2.
10、corrosion resistance: 150 h。
11、creepage distance: 35 mm。
12、protection level: IP20。
13、installation method: fixed bracket.
14、grounding method: tn-s。
15、terminal blocks: 15 pcs.
16、auxiliary contacts: 12 pieces.
17、auxiliary contacts: 8 pairs.
18、rated leakage action time: 1 second.
19、electrical clearance: 4 kw。
20、24-wire system 31, control power supply voltage: 220 ±10%。
22、cooling medium: 25 °C clear water below.
23、applicable altitude: 2000 m above.
