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The Live CZ280B 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 resistive loads. Rated at 80 Amps with a B-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 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 CZ280B 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.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (240A to 400A), specifically calibrated for high-power circuits with minimal inrush.
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 heaters, commercial building mains, and heavy-duty resistive 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 | CZ280B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| 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 (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 distinguishes the CZ280B from standard 63A double pole breakers?
The CZ280B offers 80A capacity with 10kA breaking capacity, providing 25% more current handling than standard 63A units while maintaining complete phase and neutral isolation for high-power applications.
2. Which commercial installations benefit most from 80A double pole protection?
Large commercial kitchens with multiple high-power ovens, industrial-scale water heating systems, main distribution boards in retail spaces, and heavy-duty catering facilities requiring 18.4kW capacity with neutral switching.
3. How does the 10kA breaking capacity enhance safety at 80A?
It ensures the breaker can safely interrupt higher fault currents found near main distribution points, preventing contact welding and ensuring reliable fault clearance in installations with higher available short-circuit current.
4. What continuous load capacity does this breaker provide?
At 80A rating with 10kA protection, it delivers 18.4kW maximum capacity with 14.7kW continuous load capability (80% rule), ideal for sustained high-power resistive applications requiring complete isolation.
5. What wiring considerations apply to 80A double pole installations?
Requires 16mm² minimum copper conductors with 25mm² recommended for voltage drop control. Both phase and neutral conductors must be identical size, with terminals rated for appropriate cable capacity.
