Outstanding Product Features
● Compact Design & Digital Twin Integration: Feature-rich yet compact, with installation dimensions identical to CM3 and CM3E, facilitating complete set usage.
● Reliable Operation & Superior Performance:
● Ultimate short-circuit breaking capacity (Icu) up to 85kA, 100kA; mechanical durability up to 20,000 operations, ensuring high reliability.
● Rated impulse withstand voltage (Uimp) up to 8kV, with isolation function and clear indication, ensuring high safety performance.
● Multifunctional, Meets Intelligent Management Needs: Integrates overload, short-circuit, undervoltage, overvoltage, phase failure, neutral failure, residual current (earth leakage) protection. Compatible with various accessories for auxiliary, alarm, undervoltage release, shunt trip, and other switching information and control requirements.
● Smart Communication: Built-in RS485 communication interface enabling remote measurement (telemetry), remote signaling (telesignaling), remote control (telecontrol), and remote adjustment (teletuning) for intelligent grid management.
● User-Friendly Design:
● Large LCD display automatically cycles showing real-time residual current value and residual current operating value. Automatically displays trip cause, fault phase sequence, and parameters at trip upon fault tripping.
● Clear interface allows users to conveniently control the circuit breaker and set parameters directly on the panel.
Series Overview
● CM3ZL integrates residual current protection functionality based on the CM3Z circuit breaker. Available in four frame sizes: 100A, 250A, 400A, 800A. Current ratings range from 40A to 800A; residual current settings range from 30mA to 1000mA.
● Classified by rated ultimate short-circuit breaking capacity (Icu) into M-Type (Higher Breaking Capacity) and H-Type (High Breaking Capacity).
● Can be installed horizontally (side-by-side), vertically (top-to-bottom), or flat-mounted.
● All circuit breakers feature an isolation function, denoted by the symbol: 1×
● CM3ZL circuit breakers can include an earth leakage alarm without tripping function, avoiding significant losses caused by power outages, meeting the requirements of GB13955-2005 Clause 4.6.
Circuit Breaker Conforms to the Following Standards:
● IEC 60947-1 & GB/T 14048.1-2012 Low-voltage switchgear and controlgear - General rules
● IEC 60947-2 & GB/T 14048.2-2008 Low-voltage switchgear and controlgear - Circuit-breakers
● IEC 60947-4-1 & GB/T 14048.4-2010 Low-voltage switchgear and controlgear - Contactors and motor-starters - Electromechanical contactors and motor-starters (including motor protection devices)
Normal Service and Mounting Conditions
● Ambient air temperature: -5°C to +40°C;
● Altitude at installation site not exceeding 2000m;
● Relative humidity at installation site not exceeding 50% at max. temperature of +40°C; higher relative humidity permissible at lower temperatures, e.g., 90% at 20°C. Special measures should be taken for occasional condensation due to temperature changes;
● Pollution Degree: 3;
● Complies with GB/T 2423.10, capable of withstanding mechanical vibration: 2Hz~13.2Hz, displacement ±1mm; 13.2Hz~100Hz, acceleration ±0.7g.
● Installation Category: Main circuit - III; Auxiliary/Control circuits - II;
● Suitable for Electromagnetic Environment A;
● Tropical Type (TH Type) circuit breakers comply with GB/T 2423.4, resistant to humid air, salt mist, oil mist, and mold;
● Must be installed in locations free from explosion hazards, conductive dust, and substances corrosive to metal or destructive to insulation;
● Must be installed in locations protected from rain and snow.
Permissible Operating Conditions:
● Complies with GB/T 2423.1 and GB/T 2423.2; ambient air temperature can be as low as -25°C and as high as +70°C (derating required above +40°C, refer to technical data in this catalog).
● Characteristics unaffected up to 2500m altitude (derating required above 2500m, refer to technical data in this catalog).
Storage Conditions:
● Ambient air temperature: -25°C to +70°C.
Application Areas
Low-Voltage Distribution Protection
● CM3ZL circuit breakers can be used in AC 50/60Hz TN, TT, IT distribution systems, meeting the requirements for "Selection of Electrical Equipment" in GB50054-2011.
● Reliable contact indication and isolation function of CM3ZL meet the requirements for isolation devices in GB50054.
Motor Circuit Protection
● CM3ZL circuit breakers provide overcurrent protection for motor starters, cables, and motors. Protection characteristics comply with GB/T 14048.4; application meets GB50055.
Residual Current Protection
● CM3ZL circuit breakers provide protection against dangerous contact voltage due to insulation faults, and also against hazards like fire caused by insulation damage, e.g., cable insulation failure.
● CM3ZL circuit breakers with a rated residual operating current of 30mA can provide additional protection against direct contact.
● CM3ZL circuit breakers provide Type A residual current protection for AC systems superimposed with pulsating DC components, meeting the selection requirements for residual current protective devices (RCDs) in GB50054 and GB13955.
● Tripping times meet the requirements for graded coordination in GB13955.
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