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The Live CB350D 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 at very high power levels. Rated at 50 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 CB350D ensures equipment protection and operational safety for specialized heavy industrial applications requiring three-phase protection with extreme surge tolerance at very high 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.
D-Curve Characteristic: Trips instantaneously at 10-20 times rated current (500A to 1000A), specifically engineered for applications with extremely high inrush currents.
Very High-Capacity 50A Three-Phase Protection with Extreme Surge Tolerance: Ideal for massive power transformers, heavy industrial welding equipment, large motor-generator sets, and ultra heavy machinery with extremely high startup currents.
Specialized Heavy Industrial Focus: Prevents nuisance tripping where standard B/C curves would fail due to extreme inrush at very 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 | CB350D |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 50 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 50A D-Curve triple pole MCB?
Massive three-phase power transformers (up to 25kVA), heavy industrial welding equipment, large motor-generator sets, ultra-heavy industrial machinery, and circuits where extremely high inrush currents (up to 1000A) occur at high running currents.
2. Why choose D-Curve over C-Curve for 50A three-phase ultra-heavy industrial applications?
D-Curve (10-20x In) handles inrush currents up to 1000A where C-Curve (5-10x In) would trip at 500A, making D-Curve essential for massive transformers and heavy welding equipment with extreme magnetizing inrush.
3. What transformer size can this 50A D-Curve breaker support?
Suitable for three-phase power transformers up to 25kVA, depending on inrush characteristics. The D-Curve tolerates the extreme magnetizing inrush during transformer energization without nuisance tripping.
4. What is the power capacity of this 50A three-phase D-Curve breaker?
Maximum resistive load: 34.64kW at 400V three-phase. For inductive applications, suitable for massive transformer and ultra-heavy welding equipment loads within the 50A running current limit.
5. What cable size is mandatory for 50A D-Curve three-phase ultra-heavy industrial circuits?
10mm² copper conductor minimum per phase. 16mm² MANDATORY for longer runs and mechanical robustness in ultra-heavy industrial environments. All three phase conductors must be same size.
