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The Live CB310D Triple Pole MCB is a specialized high-performance miniature circuit breaker engineered to provide reliable protection for three-phase electrical circuits with extremely high inrush currents. Rated at 10 Amps with a D-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 D-curve characteristic (10-20x In) is specifically designed for applications with very high momentary startup currents, ensuring the breaker tolerates these extreme surges while maintaining full protection against overloads and short circuits. With its robust construction and precision thermo-magnetic release, the CB310D ensures equipment protection and operational safety for specialized industrial applications requiring three-phase protection with extreme surge 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.
D-Curve Characteristic: Trips instantaneously at 10-20 times rated current (100A to 200A), specifically engineered for applications with extremely high inrush currents.
Versatile 10A Three-Phase Protection with Extreme Surge Tolerance: Ideal for three-phase control transformers, solenoid valve banks, X-ray equipment, and specialty industrial machinery with high startup currents.
Specialized Application Focus: Prevents nuisance tripping where standard B/C curves would fail due to extreme inrush at moderate current ratings.
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 | CB310D |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 10 Amperes |
| Trip Curve Type | D Curve (10-20 × 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 D-Curve triple pole MCB?
Three-phase control transformers (up to 4kVA) with high inrush, industrial solenoid valve banks, X-ray equipment, small welding transformers, and circuits where extremely high inrush currents occur at moderate running currents.
2. Why choose D-Curve over C-Curve for 10A three-phase transformer protection?
D-Curve (10-20x In) handles inrush currents up to 200A where C-Curve (5-10x In) would trip at 100A, making D-Curve essential for transformers with high magnetizing inrush during energization.
3. What transformer size can this 10A D-Curve breaker support?
Suitable for three-phase control transformers up to 4kVA, depending on inrush characteristics. The D-Curve tolerates the high magnetizing inrush during transformer energization without nuisance tripping.
4. What is the power capacity of this 10A three-phase D-Curve breaker?
Maximum resistive load: 6.93kW at 400V three-phase. For inductive applications, suitable for transformer and solenoid loads within the 10A running current limit.
5. What cable size is recommended for 10A D-Curve 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.
