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Installation must be carried out by a qualified electrician.
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Suitable for indoor use.
The Live CB306B Triple Pole MCB is a precision-engineered miniature circuit breaker designed to provide reliable protection for low-current three-phase electrical circuits. Rated at 6 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 sensitive three-phase circuits. With its robust construction and precision thermo-magnetic release, the CB306B ensures equipment protection and operational safety for commercial and industrial applications requiring three-phase protection at low 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 (18A to 30A), specifically calibrated for sensitive circuits with minimal inrush.
Precision 6A Three-Phase Protection: Ideal for small three-phase lighting circuits, control panels, PLC power supplies, and instrumentation.
Wide Application Range: Suitable for commercial, light industrial, and control system installations requiring low-current 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 | CB306B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 6 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 6A triple pole MCB with B-Curve?
Small three-phase lighting circuits in commercial buildings, control panel power supplies, PLC and instrumentation feeds, small three-phase transformers (up to 2kVA), and building management system power supplies.
2. What is the power capacity of this 6A three-phase breaker?
Maximum resistive load: 4.16kW at 400V three-phase. Per phase capacity: 1.38kW at 230V. Suitable for approximately 40-50 three-phase LED lighting fittings or control applications.
3. Why choose 10kA breaking capacity for 6A three-phase circuits?
Provides enhanced protection in installations with higher fault currents, such as near main distribution boards or in industrial panels where fault levels may exceed standard 6kA ratings.
4. Can this breaker protect a small three-phase control transformer?
Yes, it's ideal for control transformers up to 2kVA, providing precise protection for both primary side and downstream control circuits with fast B-Curve response.
5. What cable size is recommended for 6A three-phase circuits?
1.5mm² copper conductor minimum per phase. 2.5mm² recommended for mechanical robustness. Terminals accept up to 16mm². All three phase conductors should be same size.
