Type:Moulded Case Poles Number:3P,4P Rated Insulation voltage (V):660V Rated Operating Voltage(V):380V Rated current (A):32,40,50,63,100,125,160,180,200,225,250,315,350,400,500,630,800 Quality:GOOD
Molded case circuit breaker can automatically cut off the current when the current exceeds the trip setting. Moulded case refers to the use of plastic insulators as the outer shell of the device, used to isolate between conductors and ground metal parts. Molded case circuit breakers usually contain a thermal magnetic trip unit, while large models of molded case circuit breakers are equipped with solid state trip sensors. The trip unit is divided into: thermal magnetic trip and electronic trip.
1.Complete attachments
2.High breaking capacity
3.Pure copper conducting loop,slow temperature increase.little power consumption
4. Fire retardant
5.silver ornamental.snnall contact resistance
6.Imported double gold, steady overload property
7.Short arcing.reduce cabinet dimensions
8.Super electric terminal
9.Various operating methods
Molded case circuit breakers are also called device type circuit breakers. All parts are sealed in a plastic case. Auxiliary contacts, undervoltage releases and shunt releases are mostly modular. Due to the very compact structure, the molded case circuit breaker is basically unrepairable. Most of them use manual operation, and large-capacity optional electric switching. Due to the application of electronic overcurrent releases, molded case circuit breakers can also be divided into two types, A and B. Type B has good three-stage protection characteristics, but due to price factors, the use of thermal magnetic releases Class A products have a higher market share. Molded case circuit breakers are equipped with contacts, arc extinguishing chambers, trip units, and operating mechanisms in a plastic case. Maintenance is not generally considered. They are suitable for branch circuit breakers. Overcurrent trip units have thermal magnetism. There are two types of protection: electronic and plastic. General thermomagnetic molded case circuit breakers are non-selective circuit breakers. They only have two types of protection: overload long delay and short-circuit transient protection. Electronic molded case circuit breakers have overload long delay and short short circuit. Delay, short-circuit transient and ground fault protection. Some new products of electronic moulded case circuit breakers also have the function of regional selective interlocking. Most molded case circuit breakers are manually operated, and some also have motor operating mechanisms.
The main contacts of the low-voltage circuit breaker are closed manually or electrically. After the main contact is closed, the free trip mechanism locks the main contact in the closed position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release and the power supply are connected in parallel.
When the circuit is short-circuited or severely overloaded, the armature of the overcurrent tripper is engaged to make the free trip mechanism actuate, and the main contact opens the main circuit.
When the circuit is overloaded, the thermal element of the thermal release heats up and bends the bimetal, pushing the free trip mechanism to move, and the main contact opens the main circuit.
When the circuit is under voltage, the armature of the under voltage release is released, and the free trip mechanism is also activated, and the main contact opens the main circuit.
When the shunt release button is pressed, the shunt release armature engages, causing the free trip mechanism to operate, and the main contact opens the main circuit.
Low-voltage circuit breakers are classified according to different quenching media. Circuit breakers using air as the arc extinguishing medium are called air circuit breakers (air switches); circuit breakers using inert gas as the arc extinguishing medium are called inert gas circuit breakers. (Inert gas switch); circuit breakers that use oil as the arc extinguishing medium are called oil circuit breakers (oil switches).