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The Live CZ1125C Single Pole MCB is an ultra-high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for maximum-power single-phase electrical circuits with significant inductive loads. Rated at 125 Amps with a C-curve tripping characteristic, this 1-pole breaker safeguards the phase conductor on AC systems up to 230V 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 large industrial equipment. With its robust construction and precision thermo-magnetic release, the CZ1125C 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.
Ultra-High-Capacity Single Pole Protection: Protects one phase conductor for maximum-power single-phase 230V circuits up to 125A.
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-Capacity 125A Protection with Inductive Tolerance: Ideal for main distribution feeders, large industrial machinery, heavy commercial installations, and maximum-power inductive loads.
Extended Current Range: Provides protection for applications requiring 125A capacity, well beyond standard MCB ratings.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response.
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 | CZ1125C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| 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 |
| 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 single 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, commercial building mains, and installations near main transformers where fault currents are high.
2. What is the advantage of 125A C-Curve over lower rated MCBs?
Provides essential capacity for facilities with very high power demands, handles massive inrush currents up to 1250A from large motors and transformers, and ensures reliable operation without overloading.
3. What is the power capacity of this 125A C-Curve 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 125A rating with 10kA breaking capacity?
Combines ultra-high current handling with enhanced fault interruption capability, essential for main distribution in large facilities where both high continuous loads and high fault currents are present.
5. What cable size is mandatory for 125A circuits?
35mm² copper conductor minimum. 50mm² strongly recommended for longer runs, higher ambient temperatures, and to ensure proper termination capacity. Never use smaller cable for 125A circuits.
