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The Live CB320D Triple Pole MCB is a specialized high-performance industrial-grade miniature circuit breaker engineered to provide reliable protection for three-phase electrical circuits with extremely high inrush currents. Rated at 20 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 CB320D 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 (200A to 400A), specifically engineered for applications with extremely high inrush currents.
High-Capacity 20A Three-Phase Protection with Extreme Surge Tolerance: Ideal for three-phase power transformers, large welding equipment, industrial solenoid banks, and heavy machinery with very high startup currents.
Specialized Application Focus: Prevents nuisance tripping where standard B/C curves would fail due to extreme inrush at medium-high 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 | CB320D |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 20 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 20A D-Curve triple pole MCB?
Three-phase isolation transformers (up to 9kVA), industrial welding equipment, large solenoid banks, X-ray machines, and circuits where extremely high inrush currents occur at medium-high running currents.
2. Why choose D-Curve over C-Curve for 20A three-phase transformer protection?
D-Curve (10-20x In) handles inrush currents up to 400A where C-Curve (5-10x In) would trip at 200A, making D-Curve essential for larger transformers with high magnetizing inrush during energization.
3. What transformer size can this 20A D-Curve breaker support?
Suitable for three-phase isolation transformers up to 9kVA, 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 20A three-phase D-Curve breaker?
Maximum resistive load: 13.86kW at 400V three-phase. For inductive applications, suitable for transformer and welding equipment loads within the 20A running current limit.
5. What cable size is recommended for 20A D-Curve three-phase circuits?
2.5mm² copper conductor minimum per phase. 4mm² recommended for mechanical robustness and longer runs. All three phase conductors must be same size. Terminals accept up to 16mm².
