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The Live CZ280C Double Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for high-power single-phase circuits requiring simultaneous switching of both phase and neutral conductors with significant inductive loads. Rated at 80 Amps with a C-curve tripping characteristic, this 2-pole breaker safeguards both the phase and neutral conductors on AC systems up to 230/400V 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. 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 equipment. With its robust construction and precision thermo-magnetic release, the CZ280C ensures complete circuit isolation and equipment protection for demanding high-power applications requiring current ratings above the standard range with enhanced interrupting capacity.
Complete Double Pole Protection: Simultaneously protects and switches both phase and neutral conductors, ensuring complete circuit isolation during fault conditions and maintenance.
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.
Complete Isolation: Neutral pole disconnects simultaneously with phase, preventing floating neutral conditions and ensuring safety during maintenance.
Extended Current Range: Ideal for main distribution feeders, large industrial machinery, commercial building mains, and heavy-duty inductive loads.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on both 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 | CZ280C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| 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 (both poles) |
| Neutral Pole Protection | Fully protected and switched |
| 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 double pole C-Curve MCB?
Large single-phase industrial compressors, heavy-duty conveyor systems, industrial HVAC units, large welding equipment, and commercial refrigeration systems requiring up to 18.4kW with complete phase and neutral isolation.
2. How does the 800A magnetic trip threshold benefit motor starting?
It accommodates starting currents up to 800A from large motors without nuisance tripping, allowing equipment like 15HP compressors to start reliably while maintaining full fault protection.
3. What is the advantage of 10kA breaking capacity at 80A for industrial settings?
Industrial environments near transformers often have fault currents approaching 10kA; this rating ensures the breaker can safely interrupt maximum fault current without catastrophic failure.
4. Why choose 80A C-Curve over B-Curve for mixed industrial loads?
C-Curve handles the high inrush from motor starting while still protecting resistive elements, making it ideal for facilities with both inductive and resistive equipment on the same circuit.
5. What installation considerations apply to 80A double pole industrial circuits?
Requires 16mm² minimum copper conductors, 25mm² recommended. Both phase and neutral must be identical size. Terminations should be torqued to manufacturer specifications for reliable long-term performance.
