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The Live CZ380C 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 significant inductive loads. Rated at 80 Amps with a C-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 C-curve characteristic (5-10x In) provides excellent protection for circuits with substantial inductive loads while accommodating the inrush currents typical of large industrial machinery and equipment. With its robust construction and precision thermo-magnetic release, the CZ380C 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.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (400A to 800A), specifically calibrated for high-power circuits with significant inductive loads.
Extended Current Range: Ideal for main distribution boards, large industrial machinery, commercial building mains, and heavy-duty inductive 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 | CZ380C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 80 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 (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 industrial applications require an 80A triple pole C-Curve MCB with 10kA protection?
Medium-sized industrial compressors (20-25HP), large HVAC systems, industrial pump sets, conveyor systems, and manufacturing equipment where 63A is insufficient but 100A exceeds requirements.
2. How does the 800A magnetic trip threshold benefit motor starting?
It accommodates starting currents up to 800A from 20-25HP motors without nuisance tripping, allowing equipment to start reliably while maintaining full fault protection.
3. What is the power capacity of this 80A three-phase C-Curve breaker?
Maximum load: 55.4kW at 400V three-phase. For motor applications, suitable for equipment up to 22-25kW depending on starting characteristics and duty cycle, with 10kA fault protection.
4. Why choose 80A C-Curve over 63A for industrial applications?
Provides 25% additional capacity with the same form factor, ideal for facilities with growing power demands or where 63A circuits are operating near capacity, preventing nuisance tripping.
5. What cable size is recommended for 80A three-phase industrial circuits?
16mm² copper conductor minimum per phase. 25mm² strongly recommended for longer runs to minimize voltage drop during motor starting. All three phase conductors must be same size.
