CFB3 Series Mini Circuit Breaker MCB

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Scope of application

The CFB3-63/125 series miniature circuit breaker is suitable for overload and short circuit protection in circuits with a rated voltage of 230V/400V and a rated current of 125A at a frequency of 50/60Hz per thousand AC and can also be used for infrequent on/off operations of the circuit under normal conditions.

The CFB3-63/125 series circuit breakers are equipped with accessories such as CFB3-F auxiliary contacts, CFB3-FB auxiliary alarm contacts, CFB3-FL shunt release, CFB3-QY Undervoltage release, CFB3-GY overvoltage release, CFB3-GQY overvoltage release, etc., providing convenience for intelligent control of smart buildings.

Overvoltage, undervoltage, and overvoltage/undervoltage are electronic release devices that are assembled and combined with circuit breakers or residual current circuit breakers. They are suitable for AC 50Hz/60Hz circuits with a rated voltage of 230V and are used to protect against overvoltage, Undervoltage, and overvoltage caused by line faults, avoiding damage to electrical equipment or inability to function properly due to fluctuations in grid voltage. The circuit breaker has an isolation function, symbolized by 

The product meets the following standards: GB/T10963.1,IEC60898-1、GB/T20645.

Structure characteristics

This circuit breaker has good current limiting characteristics, extremely short arc time, high breaking capacity, precise protection characteristics, long service life, and reliable performance.

The shell adopts a unique curved design, with a flowing ventilation groove on the side to improve heat dissipation and reduce product temperature rise.

Has clear indication of contact position status.

The terminal block has a dual-purpose connection method for both the busbar and wire.

The accessories are complete, including auxiliary contacts, alarm contacts, shunt release, undervoltage release, overvoltage release, overvoltage release, and other accessories.

Working condition

◇ The upper limit of the surrounding air temperature shall not exceed+40 ℃, the lower limit shall not be lower than -5 ℃, and the 24-hour average value shall not exceed+35 ℃;

◇ Altitude: The altitude of the installation site shall not exceed 2000m;

◇ Atmospheric conditions: At+40 ℃, the relative temperature of the air does not exceed 50%, and higher relative humidity is allowed at lower temperatures;

◇ The average minimum temperature of the wettest month shall not exceed+25 ℃, and the average maximum relative humidity of that month shall not exceed 90%, taking into account condensation on the surface of the product caused by temperature changes;

◇ Pollution level: Level 2;

◇ Installation category: Class III;

◇ Installation type: TH35-7.5 type installation rail is used for installation;

◇ Installation conditions: The inclination angle between the installation surface and the vertical surface shall not exceed 5 °.

Specifications and parameters

Appearance and dimensions

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