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Suitable for indoor use.
The Live CB306C Triple Pole MCB is a precision-engineered miniature circuit breaker designed to provide reliable protection for low-current three-phase electrical circuits with small inductive loads. Rated at 6 Amps with a C-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 C-curve characteristic (5-10x In) provides excellent protection for circuits with small inductive loads while accommodating the inrush currents typical of control transformers, small motors, and lighting with ballasts. With its robust construction and precision thermo-magnetic release, the CB306C ensures equipment protection and operational safety for commercial and industrial applications requiring three-phase protection with inductive load tolerance.
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.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (30A to 60A), specifically calibrated for circuits with small inductive loads and moderate inrush.
Precision 6A Three-Phase Protection with Inductive Tolerance: Ideal for small three-phase motors (up to 2HP), control transformers, and lighting with electronic ballasts.
Inductive Load Capability: Handles moderate inrush currents from control equipment without nuisance tripping.
Wide Application Range: Suitable for commercial, light industrial, and control system installations requiring low-current three-phase protection for inductive 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 | CB306C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 6 Amperes |
| Trip Curve Type | C Curve (5-10 × 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 C-Curve triple pole MCB?
Small three-phase motors up to 2HP (1.5kW), control transformers (up to 2kVA), small conveyor drives, ventilation fans with three-phase motors, and lighting circuits with discharge lamps or electronic ballasts.
2. Can this 6A C-Curve breaker handle a 1.5kW three-phase motor?
Yes, it's ideal for 1.5kW motors. The C-Curve tolerates starting currents up to 45-50A while the 6A rating provides excellent running protection without nuisance tripping.
3. What is the power capacity of this 6A three-phase C-Curve breaker?
Maximum three-phase load: 4.16kW at 400V. For motor applications, suitable for motors up to 1.5kW depending on starting characteristics and duty cycle.
4. Why choose C-Curve over B-Curve for small three-phase motors?
C-Curve (5-10x In) handles starting currents up to 60A where B-Curve (3-5x In) would trip at 30A, making C-Curve essential for motor circuits even at low current ratings.
5. What cable size is recommended for 6A three-phase motor 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.
