In response to the intelligent, secure and low carbon development trends of the low voltage power distribution industry, C&J has officially launched the CJMM6 series thermomagnetic moulded case circuit breaker. This high breaking capacity MCCB for industrial and commercial power distribution, together with our reliable Miniature Case Circuit Breaker for residential and light commercial wiring, adopts thermomagnetic release principle and covers frame current ratings from 125A up to 2000A. It achieves comprehensive improvements in safety protection, short circuit withstand performance, accessory expandability, as well as energy conservation. It is widely applicable to power distribution scenarios including industrial production, commercial buildings, municipal engineering and new energy projects, building a solid safeguard for the stable, safe and efficient operation of low voltage MCCB power distribution systems for industrial plants across various industries.
As a core protective component in low voltage power distribution systems, MCCBs and compact Miniature Case Circuit Breaker for small scale power distribution provide critical protection against circuit overload, short circuit and undervoltage faults, serving as essential equipment to secure electrical devices and personal safety while avoiding electrical failures. The CJMM6 series belongs to selective category Class A, with rated insulation voltage Ui up to 1000V and rated impulse withstand voltage Uimp of 8 kV. Its rated operating voltage supports AC 230V, AC 400V and AC 690V, available in 1P, 2P, 3P and 4P pole configurations to satisfy diverse wiring requirements. Based on years of in depth research in the low voltage electrical industry, C&J optimizes product structure and core components in a targeted manner, solving the pain points of traditional MCCBs such as single protection functions, poor adaptability to harsh environments, and inconvenient post operation maintenance for intelligent MCCB circuit breakers for solar and energy storage systems, as well as common defects of conventional Miniature Case Circuit Breaker for domestic electrical installations.
The upgraded CJMM6 MCCB boasts outstanding core advantages in breaking capacity grades including C, S, M and H types. For CJMM6-125 frame size, the ultimate short circuit breaking capacity Icu can reach up to 50 kA at AC 400V; larger frame sizes such as CJMM6-400 deliver maximum Icu up to 65 kA under AC 400V working condition. It can maintain stable operation within working temperature ranging from -5 °C to +40 °C, suitable for installation altitude below 2000 m, greatly reducing the risk of equipment failure and power supply accidents for heavy duty MCCB breakers for industrial power control. This series supports rich internal and external optional accessories: shunt release, undervoltage release, auxiliary contacts, alarm contacts, electric operating devices, rotary handles, plug in units and draw-out structures are all selectable. While for light duty branches, our compact Miniature Case Circuit Breaker with over current protection offers flexible space saving solutions inside distribution boards.
In terms of application flexibility, CJMM6 series thermomagnetic moulded case circuit breakers are mainly designed for general power distribution tasks; models below 630A can also realize motor protection function for infrequent motor starting. Multiple installation and wiring options are provided: fixed front panel wiring, back panel wiring, plug in split / integrated type wiring and draw out mounting modes are supported to adapt to cabinet internal layout demands. This energy saving modular MCCB for commercial building distribution perfectly balances reliable protection and long term operational cost reduction, making it an ideal choice for medium and large power distribution projects; meanwhile, the space optimized Miniature Case Circuit Breaker for cabinet internal wiring satisfies the demand for fine branch circuit protection.
Up to now, the CJMM6 series thermomagnetic MCCB has completed batch production and market promotion. With its wide current range (10A 2000A), multiple breaking capacity classes and abundant accessory combinations, it has been widely recognized by domestic and overseas customers for reliable low voltage molded case circuit breaker for new energy projects. Our complete product portfolio covering heavy duty CJMM6 MCCB and high performance Miniature Case Circuit Breaker for building electrical systems enables us to deliver one stop low voltage protection solutions for different project specifications. In the future, C&J will continue to focus on technological innovation in low voltage power distribution equipment, continuously optimize product performance and quality, launch more high efficiency, reliable power distribution products, and contribute to the high quality development of global smart power distribution systems.
Post time: Sep-23-2026