Motor with the choice of circuit breaker

electric induction motor fan blade for ac motor 

Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality

3. Delivery Detail:within 10 days after receiving deposit
Low voltage circuit breaker is generally divided into plastic shell type (also known as the device type) and frame type (also called universal type) two kinds big. The motor under 380 v245kw and more choose molded case circuit lamination machine breaker. Circuit breaker can be divided into the distribution line protection www.dongfeng- motor.com according to the use and protection, lighting protection circuit of the motor and electric leakage protection use and so on. Motor protection circuit breaker selection principles: (1) the set values for the long time delay current is equal to the rated current of the motor. (2) the instantaneous current setting: for the protection of cage motor circuit breaker, the adjusting current instantaneous equal to 8 to 15 times the rated current of the motor, rotor and stator depending on single phase motor the protected cage motor model, capacity and starting conditions. 

Alibaba China Suppliers!!Export aluminum electric motor casing 
Specifications
1. a replace of Y motor 
2. larger output 
3. save energy 

4. Delivery Detail:within 30-35 days after receiving the deposit
For wound rotor motor protection circuit breaker, the adjusting current instantaneous is equal to (3 acmotor2.blogspot.com ~ 6) times the rated current magnetic generator of the motor, depending on the protected wound rotor motor model, capacity and starting conditions. (3) 6 times of long time delay current setting value can return time is greater than or equal to the ac motors starting time of the motor. According to the weight of the starting load, can choose to return time 1 s, 3 s, generator 5 s, one of an 8 s, 15 s. Circuit breaker tripping device setting ac synchronous generator current simplified formula: "instant-on, motor kw 20 times" "thermal trip, according to the rating of the above formula is to protect a 380 v control of three-phase cage type motor circuit breakers, instantaneous motion setting its electromagnetic tripping current, according to the number of" kw "20 times". For thermal trip, according to the rated current of the motor selection.