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Suitable for indoor use.
The Live CZ4125B 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 resistive loads. Rated at 125 Amps with a B-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 B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of ultra-high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ4125B 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.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (375A to 625A), specifically calibrated for ultra-high-power circuits with minimal inrush.
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 heaters, commercial building mains, and heavy-duty resistive 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 | CZ4125B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 4 Pole (4P) - Switches L1, L2, L3 + N |
| Current Rating (In) | 125 Amperes |
| Trip Curve Type | B Curve (3-5 × 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 large-scale applications require a 125A 4-pole B-Curve MCB with 10kA protection?
Main distribution boards for large industrial complexes, commercial high-rises, data center power distribution, hospital main switchboards, and installations with TN-S or IT earthing systems requiring complete isolation.
2. What is the power capacity of this 125A 4-pole B-Curve breaker?
Maximum resistive load: 86.5kW at 400V three-phase. Continuous load (80% rule): 69kW. Suitable for very large industrial heating applications and main distribution with fast B-Curve response.
3. Why choose 125A 4-pole over 100A for large commercial buildings?
Provides 25% additional capacity for facilities with high power demands, essential for buildings with large HVAC systems, elevators, and heavy equipment where 100A would be insufficient.
4. What earthing systems require 4-pole isolation at 125A capacity?
IT earthing systems (unearthed neutral), TN-C-S to TN-S transition points, generator changeover panels, and installations where complete isolation of all conductors including neutral is mandated by regulations.
5. What cable size is mandatory for 125A 4-pole 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.
