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The Live CZ3100B Triple Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for very high-power three-phase electrical circuits with resistive loads. Rated at 100 Amps with a B-curve tripping characteristic, this 3-pole breaker safeguards all three phases (L1, L2, L3) 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 very high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ3100B ensures equipment protection and operational safety for demanding high-power applications requiring current ratings above the standard range with enhanced interrupting capacity.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
High-Capacity 100A Rating: Provides protection for applications requiring 100A capacity, beyond the standard 63A maximum of conventional MCBs.
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 (300A to 500A), specifically calibrated for high-power circuits with minimal inrush.
Extended Current Range: Ideal for main distribution boards, large industrial heaters, commercial building mains, and heavy-duty resistive loads.
Industrial-Grade Protection: Suitable for demanding industrial applications requiring robust three-phase protection at higher current ratings.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all three 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 | CZ3100B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 100 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) |
| 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 | 35-50 mm² (suitable for 100A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 100A triple pole B-Curve MCB with 10kA protection?
Main distribution boards for industrial facilities, large commercial building mains, high-power industrial heaters (up to 69kW), large-scale catering equipment, and main switchgear requiring fast fault response.
2. What is the power capacity of this 100A three-phase B-Curve breaker?
Maximum resistive load: 69kW at 400V three-phase. Continuous load (80% rule): 55kW. Suitable for very high-power industrial heating applications and main distribution with fast B-Curve response.
3. How does the 10kA breaking capacity enhance safety at 100A?
It ensures the breaker can safely interrupt higher fault currents found near main transformers and distribution points, preventing contact welding and ensuring reliable fault clearance in high-power installations.
4. Why choose B-Curve over C-Curve for 100A three-phase industrial applications?
B-Curve (3-5x In) provides faster fault clearance (300-500A trip) than C-Curve (500-1000A), offering better protection for resistive heating elements while responding to actual fault conditions more quickly.
5. What cable size is mandatory for 100A three-phase circuits?
25mm² copper conductor minimum per phase. 35mm² strongly recommended for longer runs, higher ambient temperatures, and to ensure proper termination capacity. All three phase conductors must be same size.
