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The Live CZ4125C 4 Pole MCB is an ultra-high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for maximum-power three-phase electrical circuits requiring simultaneous switching of all three phases and neutral conductor with significant inductive loads. Rated at 125 Amps with a C-curve tripping characteristic, this 4-pole breaker safeguards all three phases (L1, L2, L3) and the neutral (N) conductor 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 CZ4125C ensures complete circuit isolation and equipment protection for the most demanding high-power applications requiring current ratings well above the standard range with enhanced interrupting capacity.
Complete 4-Pole Protection: Simultaneously protects and switches all three phases (L1, L2, L3) and the neutral (N) conductor, ensuring complete circuit isolation during fault conditions and maintenance.
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.
Complete Isolation: Neutral pole disconnects simultaneously with phases, preventing floating neutral conditions and ensuring safety during maintenance.
Maximum Extended Current Range: Ideal for main distribution boards, large industrial machinery, commercial building mains, and heavy-duty inductive loads requiring neutral switching.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all four 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 | CZ4125C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 4 Pole (4P) - Switches L1, L2, L3 + N |
| 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) |
| Neutral Pole Protection | Fully protected and switched |
| 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 | 50-70 mm² (suitable for 125A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific heavy industrial applications require a 125A 4-pole C-Curve MCB with 10kA protection?
Main distribution boards for heavy manufacturing plants, large industrial complexes with IT earthing systems, major generator changeover panels, mining operations, and facilities with large motor loads requiring complete isolation.
2. How does the 1250A magnetic trip threshold benefit large motor applications?
Accommodates starting currents up to 1250A from 45-50kW motors without nuisance tripping, allowing critical industrial equipment to start reliably while maintaining full fault protection.
3. What is the power capacity of this 125A 4-pole 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, with 10kA fault protection and complete neutral isolation.
4. Why choose 4-pole C-Curve at 125A for critical industrial applications?
Provides complete isolation of all conductors including neutral, essential for IT earthing systems and generator applications, while handling massive inrush currents from the largest industrial motors.
5. What cable size is mandatory for 125A 4-pole heavy industrial circuits?
35mm² copper conductor minimum per phase and neutral. 50mm² strongly recommended for longer runs and higher ambient temperatures. All four conductors (L1, L2, L3, N) must be identical size.
