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The Live CZ2125C Double Pole MCB is an ultra-high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for maximum-power single-phase circuits requiring simultaneous switching of both phase and neutral conductors with significant inductive loads. Rated at 125 Amps with a C-curve tripping characteristic, this 2-pole breaker safeguards both the phase and neutral conductors on AC systems up to 230/400V 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 equipment. With its robust construction and precision thermo-magnetic release, the CZ2125C 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 Double Pole Protection: Simultaneously protects and switches both phase and neutral conductors, 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 phase, preventing floating neutral conditions and ensuring safety during maintenance.
Maximum Extended Current Range: Ideal for main distribution feeders, large industrial machinery, commercial building mains, and heavy-duty inductive loads.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on both 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 | CZ2125C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| 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 (both 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 mm² (suitable for 125A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 125A double pole C-Curve MCB with 10kA breaking capacity?
Main distribution feeders for large industrial facilities, high-power welding equipment (up to 28kW), large industrial machinery, and installations requiring complete phase and neutral isolation near transformers with high fault currents.
2. What is the advantage of 125A C-Curve over lower rated double pole MCBs?
Provides essential capacity for facilities with extreme power demands, handles massive inrush currents up to 1250A from the largest motors and transformers, and ensures reliable operation without overloading.
3. What is the power capacity of this 125A C-Curve double pole breaker?
Maximum load: 28.75kW at 230V. For motor applications, suitable for equipment up to 18-22kW depending on starting characteristics and duty cycle, with 10kA fault protection.
4. Why choose C-Curve over B-Curve for 125A double pole industrial applications?
C-Curve (5-10x In) handles starting currents up to 1250A where B-Curve (3-5x In) would trip at 625A, making C-Curve essential for the largest industrial equipment with extreme inrush currents.
5. What cable size is mandatory for 125A double pole circuits?
35mm² copper conductor minimum. 50mm² strongly recommended for longer runs, higher ambient temperatures, and to ensure proper termination capacity. Both phase and neutral conductors must be same size.
