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The Live CZ3125C Triple Pole MCB is an ultra-high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for maximum-power three-phase electrical circuits with significant inductive loads. Rated at 125 Amps with a C-curve tripping characteristic, this 3-pole breaker safeguards all three phases (L1, L2, L3) on AC systems up to 400V at 50/60Hz frequency. It features a powerful 10kA breaking capacity, making it suitable for installations with higher prospective short-circuit currents near main distribution points and transformers. The C-curve characteristic (5-10x In) provides excellent protection for circuits with substantial inductive loads while accommodating the massive inrush currents typical of the largest industrial machinery and equipment. With its robust construction and precision thermo-magnetic release, the CZ3125C ensures equipment protection and operational safety for the most demanding high-power applications requiring current ratings well above the standard range with enhanced interrupting capacity.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
Ultra-High-Capacity 125A Rating: Provides protection for applications requiring 125A capacity, well beyond standard MCB ratings.
Enhanced 10kA Breaking Capacity: Powerful fault current interruption for installations with higher prospective short-circuit currents up to 10,000 amps.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (625A to 1250A), specifically calibrated for ultra-high-power circuits with significant inductive loads.
Maximum Extended Current Range: Ideal for main distribution boards, large industrial machinery, commercial building mains, and heavy-duty inductive loads.
Industrial-Grade Protection: Suitable for the most demanding industrial applications requiring robust three-phase protection at maximum current ratings.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all three poles.
Superior Electrical Isolation: 4000V impulse withstand rating and 500V insulation voltage for protection against voltage transients.
Extended Operational Life: 8,000 electrical operations for long-term reliability.
Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CZ |
| Model Number | CZ3125C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 125 Amperes |
| Trip Curve Type | C Curve (5-10 × In) |
| Operational Voltage | 230/400V AC |
| Rated Breaking Capacity | 10kA (10000 Amps) |
| Frequency Range | 50/60 Hertz |
| Insulation Rating (Ui) | 500 Volts |
| Impulse Withstand (Uimp) | 4000 Volts (1.2/50 µs) |
| Dielectric Test Voltage | 2kV for 60 seconds |
| Protection Mechanism | Thermo-magnetic (all poles) |
| Operating Temperature | -5°C to +40°C (daily average ≤35°C) |
| Calibration Reference | 30°C |
| Storage Temperature | -25°C to +70°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | 50 mm² (suitable for 125A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific heavy industrial applications require a 125A triple pole C-Curve MCB with 10kA protection?
Main distribution boards for heavy manufacturing plants, large compressor stations (40-50HP), major pump installations, industrial HVAC systems for large facilities, and mining equipment with significant motor loads.
2. How does the 1250A magnetic trip threshold benefit large motor starting?
It accommodates starting currents up to 1250A from the largest motors (45-50HP) without nuisance tripping, allowing critical industrial equipment to start reliably while maintaining full fault protection.
3. What is the power capacity of this 125A three-phase C-Curve breaker?
Maximum load: 86.5kW at 400V three-phase. For motor applications, suitable for equipment up to 45-50kW depending on starting characteristics and duty cycle, with 10kA fault protection.
4. Why choose 125A C-Curve over lower rated alternatives for industrial main distribution?
Provides essential capacity for facilities with extreme power demands, handles massive inrush currents from the largest motors, and ensures reliable operation without overloading or nuisance tripping.
5. What cable size is mandatory for 125A three-phase heavy industrial circuits?
35mm² copper conductor minimum per phase. 50mm² strongly recommended for longer runs, higher ambient temperatures, and to minimize voltage drop during motor starting. All three phase conductors must be same size.
