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The Live CZ2100B Double Pole MCB is a high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for very high-power single-phase circuits requiring simultaneous switching of both phase and neutral conductors with resistive loads. Rated at 100 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 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 CZ2100B 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 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 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 | CZ2100B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Phase + Neutral |
| 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 (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 | 35-50 mm² (suitable for 100A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 100A double pole B-Curve MCB with 10kA breaking capacity?
Main distribution feeders for large commercial units, high-power industrial heaters (up to 23kW), main switches for large buildings, and installations where complete phase and neutral isolation is required near transformers with high fault currents.
2. What is the advantage of double pole isolation at 100A with 10kA protection?
Provides complete isolation of both phase and neutral for safety during maintenance, prevents floating neutral conditions in high-power installations, and ensures safe interruption of higher fault currents up to 10kA.
3. What is the power capacity of this 100A B-Curve double pole breaker?
Maximum resistive load: 23kW at 230V. Continuous load (80% rule): 18.4kW. Ideal for very high-power resistive loads requiring complete isolation and fast B-Curve response.
4. Why choose B-Curve over C-Curve for 100A double 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 double pole circuits?
25mm² copper conductor minimum. 35mm² strongly recommended for longer runs, higher ambient temperatures, and to ensure proper termination capacity. Both phase and neutral conductors must be same size.
