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The Live CZ480B 4 Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for high-power three-phase electrical circuits requiring simultaneous switching of all three phases and neutral conductor with resistive loads. Rated at 80 Amps with a B-curve tripping characteristic, this 4-pole breaker safeguards all three phases (L1, L2, L3) and the neutral (N) conductor 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 CZ480B ensures complete circuit isolation and equipment protection for demanding high-power applications requiring current ratings above the standard range with enhanced interrupting capacity.
Complete 4-Pole Protection: Simultaneously protects and switches all three phases (L1, L2, L3) and the neutral (N) conductor, 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 phases, preventing floating neutral conditions and ensuring safety during maintenance.
Extended Current Range: Ideal for main distribution boards, large industrial heaters, commercial building mains, and heavy-duty resistive loads requiring neutral switching.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all four 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 | CZ480B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 4 Pole (4P) - Switches L1, L2, L3 + N |
| 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) |
| 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 applications require an 80A 4-pole B-Curve MCB with 10kA protection?
Medium-sized commercial buildings, industrial facilities with TN-S earthing systems, small generator changeover panels, data center distribution, and installations requiring complete isolation with neutral switching.
2. What is the advantage of 4-pole switching at 80A with B-Curve protection?
Provides complete isolation of all live conductors including neutral, essential for IT earthing systems, prevents floating neutral conditions during maintenance, and ensures compliance with modern electrical regulations.
3. What is the power capacity of this 80A 4-pole B-Curve breaker?
Maximum resistive load: 55.4kW at 400V three-phase. Continuous load (80% rule): 44.3kW. Ideal for high-power commercial and industrial applications requiring complete isolation with fast B-Curve response.
4. How does the 80A 4-pole rating compare to standard 63A units?
Provides 25% more capacity than 63A 4-pole MCBs, making it ideal for facilities with growing power demands where 63A circuits would be operating near capacity, preventing nuisance tripping.
5. What cable size is mandatory for 80A 4-pole circuits?
16mm² copper conductor minimum per phase and neutral. 25mm² strongly recommended for longer runs and higher ambient temperatures. All four conductors (L1, L2, L3, N) must be identical size.
