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Suitable for indoor use.
The Live CZ4100B 4 Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for very high-power three-phase electrical circuits requiring simultaneous switching of all three phases and neutral conductor with resistive loads. Rated at 100 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 very high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ4100B 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 100A Rating: Provides protection for applications requiring 100A 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 (300A to 500A), 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 | CZ4100B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 4 Pole (4P) - Switches L1, L2, L3 + N |
| Current Rating (In) | 100 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 | 35-50 mm² (suitable for 100A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 100A 4-pole B-Curve MCB with 10kA protection?
Main distribution boards for large commercial buildings, industrial facilities with TN-S earthing systems, backup generator changeover panels, and installations requiring complete isolation of all conductors including neutral.
2. What is the advantage of 4-pole switching at 100A 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 100A 4-pole B-Curve breaker?
Maximum resistive load: 69kW at 400V three-phase. Continuous load (80% rule): 55kW. Ideal for very high-power industrial applications requiring complete isolation with fast B-Curve response.
4. Why choose B-Curve over C-Curve for 100A 4-pole applications?
B-Curve (3-5x In) provides faster fault clearance (300-500A trip) than C-Curve (500-1000A), offering better protection for resistive loads while responding to actual fault conditions more quickly.
5. What cable size is mandatory for 100A 4-pole circuits?
25mm² copper conductor minimum per phase and neutral. 35mm² strongly recommended for longer runs and higher ambient temperatures. All four conductors (L1, L2, L3, N) must be same size.
