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Suitable for indoor use.
The Live CZ380B Triple Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for high-power three-phase electrical circuits with resistive loads. Rated at 80 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 high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ380B 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 80A Rating: Provides protection for applications requiring 80A 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 (240A to 400A), 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 | CZ380B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 80 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 | 25-35 mm² (suitable for 80A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require an 80A triple pole B-Curve MCB with 10kA protection?
Main distribution boards for medium industrial facilities, large commercial building mains, high-power industrial heaters (up to 55kW), large-scale catering equipment, and main switchgear requiring fast fault response.
2. What is the power capacity of this 80A three-phase B-Curve breaker?
Maximum resistive load: 55.4kW at 400V three-phase. Continuous load (80% rule): 44.3kW. Suitable for high-power industrial heating applications and main distribution with fast B-Curve response.
3. How does the 80A rating compare to standard industrial MCBs?
Provides 25% more capacity than 63A units, making it ideal for facilities with higher power demands where 63A would be marginal, ensuring reliable operation without overloading.
4. Why choose B-Curve over C-Curve for 80A three-phase applications?
B-Curve (3-5x In) provides faster fault clearance (240-400A trip) than C-Curve (400-800A), offering better protection for resistive heating elements while responding to actual fault conditions more quickly.
5. What cable size is recommended for 80A three-phase circuits?
16mm² copper conductor minimum per phase. 25mm² strongly recommended for longer runs, higher ambient temperatures, and to ensure proper termination capacity. All three phase conductors must be same size.
