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The Live CB320B Triple Pole MCB is a high-capacity miniature circuit breaker designed to provide reliable protection for high-power three-phase electrical circuits with resistive loads. Rated at 20 Amps with a B-curve tripping characteristic, this 3-pole breaker safeguards all three phases (L1, L2, L3) 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. The B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of high-power commercial and industrial resistive loads. With its robust construction and precision thermo-magnetic release, the CB320B ensures equipment protection and operational safety for demanding commercial and industrial applications requiring three-phase protection at higher current ratings.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
High 10kA Breaking Capacity: Powerful fault current interruption for installations with high prospective short-circuit currents up to 10,000 amps.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (60A to 100A), specifically calibrated for high-power circuits with minimal inrush.
High-Capacity 20A Three-Phase Protection: Ideal for commercial kitchen equipment, high-power lighting, water heating systems, and distribution boards.
Wide Application Range: Suitable for restaurants, hotels, retail spaces, and light industrial facilities requiring three-phase protection for resistive loads.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all three 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 and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CB |
| Model Number | CB320B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 20 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) |
| 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 | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 20A triple pole MCB with B-Curve?
Three-phase commercial kitchen equipment (ovens, cooktops), high-power lighting circuits in warehouses, water heating systems (up to 13.8kW), distribution boards, and large retail space power distribution.
2. What is the power capacity of this 20A three-phase breaker?
Maximum resistive load: 13.86kW at 400V three-phase. Per phase capacity: 4.6kW at 230V. Suitable for high-power commercial equipment and distribution applications.
3. Can this breaker be used for three-phase commercial oven protection?
Yes, it's ideal for commercial ovens up to 13.8kW, providing fast B-Curve response for resistive heating elements while ensuring complete three-phase protection.
4. Why choose 10kA breaking capacity for 20A commercial circuits?
Provides enhanced protection in installations with higher fault currents, such as near main distribution boards in commercial kitchens or retail spaces where fault levels may exceed standard 6kA ratings.
5. What cable size is recommended for 20A three-phase circuits?
2.5mm² copper conductor minimum per phase. 4mm² recommended for longer runs or higher ambient temperatures. All three phase conductors must be same size. Terminals accept up to 16mm².
