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Installation must be carried out by a qualified electrician.
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Suitable for indoor use.
The Live CB310B Triple Pole MCB is a versatile miniature circuit breaker designed to provide reliable protection for general-purpose three-phase electrical circuits. Rated at 10 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 lighting circuits and general distribution. With its robust construction and precision thermo-magnetic release, the CB310B ensures equipment protection and operational safety for commercial and light industrial applications requiring three-phase protection at standard 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 (30A to 50A), specifically calibrated for general circuits with minimal inrush.
Versatile 10A Three-Phase Protection: Ideal for three-phase lighting circuits, small distribution boards, socket outlets, and general commercial applications.
Wide Application Range: Suitable for commercial buildings, light industrial facilities, and retail spaces requiring three-phase protection.
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 | CB310B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 10 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 10A triple pole MCB with B-Curve?
Three-phase lighting circuits in commercial buildings, small distribution boards for retail spaces, three-phase socket outlets for general equipment, small HVAC fan coil units, and light commercial equipment with resistive loads.
2. What is the power capacity of this 10A three-phase breaker?
Maximum resistive load: 6.93kW at 400V three-phase. Per phase capacity: 2.3kW at 230V. Suitable for general commercial lighting and small power distribution applications.
3. Can this breaker be used for three-phase socket outlet protection?
Yes, it's ideal for protecting standard 10A three-phase socket outlets in workshops, commercial kitchens, and light industrial areas where equipment has minimal inrush currents.
4. Why choose 10kA breaking capacity for 10A commercial circuits?
Provides enhanced protection in installations with higher fault currents, such as near main distribution boards or in commercial panels where fault levels may exceed standard 6kA ratings.
5. What cable size is recommended for 10A three-phase circuits?
1.5mm² copper conductor minimum per phase. 2.5mm² recommended for mechanical robustness. All three phase conductors must be same size. Terminals accept up to 16mm².
