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The Live CZ1125B 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 resistive loads. Rated at 125 Amps with a B-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 B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of very high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ1125B 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.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (375A to 625A), specifically calibrated for ultra-high-power circuits with minimal inrush.
Maximum-Capacity 125A Protection with Fast Response: Ideal for main distribution feeders, large industrial heaters, commercial building mains, and heavy-duty resistive 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 | CZ1125B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| 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 |
| 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 B-Curve MCB with 10kA breaking capacity?
Main distribution feeders for large commercial buildings, high-power industrial heaters (up to 28kW), main switches for medium industrial facilities, and installations near main transformers where fault currents are high.
2. What is the advantage of 125A rating over 100A MCBs?
Provides essential additional capacity for facilities with very high power demands, multiple large resistive loads, or future expansion plans where 100A would be insufficient, ensuring reliable operation without overloading.
3. What is the power capacity of this 125A B-Curve breaker?
Maximum resistive load: 28.75kW at 230V. Continuous load (80% rule): 23kW. Ideal for very high-power resistive loads requiring fast B-Curve response and enhanced fault protection.
4. Why choose 10kA breaking capacity at 125A rating?
Provides essential protection in installations with highest fault currents, such as near main distribution boards or close to transformers, ensuring the breaker can safely interrupt maximum fault current without failure.
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.
The Live CZ1125B 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 resistive loads. Rated at 125 Amps with a B-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 B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of very high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ1125B 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.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (375A to 625A), specifically calibrated for ultra-high-power circuits with minimal inrush.
Maximum-Capacity 125A Protection with Fast Response: Ideal for main distribution feeders, large industrial heaters, commercial building mains, and heavy-duty resistive 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 | CZ1125B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| 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 |
| 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 B-Curve MCB with 10kA breaking capacity?
Main distribution feeders for large commercial buildings, high-power industrial heaters (up to 28kW), main switches for medium industrial facilities, and installations near main transformers where fault currents are high.
2. What is the advantage of 125A rating over 100A MCBs?
Provides essential additional capacity for facilities with very high power demands, multiple large resistive loads, or future expansion plans where 100A would be insufficient, ensuring reliable operation without overloading.
3. What is the power capacity of this 125A B-Curve breaker?
Maximum resistive load: 28.75kW at 230V. Continuous load (80% rule): 23kW. Ideal for very high-power resistive loads requiring fast B-Curve response and enhanced fault protection.
4. Why choose 10kA breaking capacity at 125A rating?
Provides essential protection in installations with highest fault currents, such as near main distribution boards or close to transformers, ensuring the breaker can safely interrupt maximum fault current without failure.
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.
