CQM6 Standard Molded Case Circuit Breaker

Core Features and Design

The CQM6 Standard is designed for versatile electrical protection in demanding systems, with frame-rated currents (Inm) ranging from 125A to 1250A, encompassing models like CQM6-125, -160, -250, -630, -800, and -1250. Its space-optimized compact architecture facilitates uniform installation in limited panels, minimizing overall system dimensions without sacrificing performance. Equipped with thermal-magnetic trip mechanisms, it provides accurate overload and short-circuit detection, with breaking capacities tiered as C-type for basic (15/8kA at 400/415V), S-type for standard (up to 50/35kA), M-type for medium (up to 75/50kA), and H-type for high (up to 75/75kA in larger frames). Supporting insulation voltages up to 800V and impulse withstand of 8kV, it ensures robustness in AC environments. Real-world testing confirms enhanced electrical endurance beyond potential handbook values: 6000 cycles for 125A and 250A frames, 3000 cycles for 400A and 630A variants, complemented by mechanical cycles of up to 3000 ON and 7000 OFF for high-demand operations. Pole configurations (3 or 4) and N-pole options (protected A/B/C or non-combinable D) allow specific adaptations for power distribution (function code 1) or motor protection (code 2).

Accessory Flexibility and Customization

Tailor the breaker with an extensive accessory portfolio to meet diverse needs, featuring alarm switches (208/308 for trip signaling), shunt releases (210/310 with voltages like AC380V or DC24V for remote tripping), auxiliary switches (220/320 for status indication), undervoltage releases (230/330 at AC220V to AC415V for voltage drop protection), and combined units such as shunt plus auxiliary (240/340) or dual auxiliaries (260/360). Motorized operation (P) is available with control voltages D1 (AC220V) to D4 (AC400V), alongside installation modes including front-plate (G), rear-plate (H), or plug-in (C) for flexibility in panel setups. Accessory voltages are versatile, with undervoltage options Q1-Q4 and shunt F2-F4, ensuring compatibility with various control systems. This modularity enables precise configuration, enhancing remote monitoring, automation integration, and operational precision while maintaining safety standards.

Applications and Compliance

Widely applicable in power distribution networks, motor starters, and industrial control systems, the CQM6 Standard excels in protecting circuits in commercial buildings, manufacturing facilities, and critical infrastructure, handling rated currents from 10A in smaller frames to 1250A in larger ones. With selectivity category A, it supports effective cascading protection to isolate faults without unnecessary outages. Rigorous adherence to IEC/EN 60947 series and GB/T 14048 standards, plus certifications, assures worldwide safety, reliability, and interoperability. Derivative offerings, such as dedicated prepayment meters and overload alarms, address specialized needs in energy management and fault detection. This series thrives in environments requiring high resilience, like renewable energy installations, assembly lines, and commercial power panels, delivering minimal-maintenance solutions that reduce operational downtime and enhance overall system productivity through durable, tested performance.

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