The GMB series three-stage protection DC plastic case circuit breaker is a new type of circuit breaker developed by Beijing People's Electric Appliance Factory using international advanced design and manufacturing technology. Its rated working voltage is DC660V and below, and its rated working current is up to 1250A in circuits. Circuit breakers have short-circuit, overload, and undervoltage protection functions, which can protect the circuit and power equipment from damage.
[Compliant with standards]
IEC60947-1 GB14048.1 General Provisions
IEC60947-2 GB14048.2 Low Voltage Circuit Breakers
IEC60947-4 GB14048.4 Contactors and Motor Starters
IEC60947-5 GB14048.5 Electromechanical Control Circuit Electrical Appliances

[Features]
The G series fully selective three-stage protection DC circuit breaker adopts the internationally pioneering patented arc extinguishing technology CCV, which is the quadruple acceleration and narrow gap breaking free arc extinguishing technology, making the arcing distance shorter and the breaking capacity higher (DC250V) 20kA, (DC440) 15kA, and Ics=100% Icu.
Small size, accurate short circuit delay, complete specifications
Normally, according to standard specifications, for the differential coordination of battery pack power systems, the calculation of short-circuit current can be simplified without considering parameters such as resistance, cable cross-sectional area, copper content, current limiting coefficient, and cable thermal stability. The upper and lower level circuit breakers only need to be selected according to the rated current level to achieve fully selective three-stage protection, which meets international standards.
The GMB series three-stage protective plastic case circuit breaker adopts the most advanced international hardness and anti-corrosion surface treatment process of soft nitriding and matte electroplating in terms of anti-corrosion performance, which makes the product's anti-corrosion performance higher than nickel plating and suitable for high protection level use.

[Basic Parameters]
Rated current of shell level: 1002254008001250A
Polar number: 2P
Rated working voltage: DC250V
Ultimate short-circuit breaking capacity: M standard type, H high type, R advanced type
Operation mode: direct operation of the body, P electric operating mechanism, Z rotating handle operation;
Wiring methods: front board wiring, B-board rear wiring, C plug-in wiring

[Model meaning]
GMB 225 M/2 3 00R 125A
The GMB series shell level rated current is 225A, with a maximum short-circuit breaking capacity of M standard type two pole three-stage protection DC plastic shell circuit breaker. It adopts a compound release (overload long delay+short-circuit short delay), rated working current is 125A, and is wired in front of the board.

[Operating Environment]
Altitude of 2000m and below;
The temperature of the surrounding medium should not be lower than -5 ℃ and not higher than 40 ℃. If it is higher than 40 ℃, it can be used with reduced capacity;
Can withstand the influence of humid air;
Capable of withstanding the effects of salt spray and oil mist;
Can tolerate the influence of mold;
Can work reliably under normal ship vibration;
In a medium without explosive hazards, and where there is no gas or conductive dust that can corrode metals or damage insulation;
In a place without rain or snow invasion.