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Suitable for indoor use.
The Live CB350C Triple Pole MCB is a heavy-duty industrial-grade miniature circuit breaker designed to provide reliable protection for three-phase electrical circuits with very large inductive loads. Rated at 50 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 very large inductive loads while accommodating the inrush currents typical of heavy industrial pumps, large compressors, and major machinery. With its robust construction and precision thermo-magnetic release, the CB350C ensures equipment protection and operational safety for demanding heavy industrial applications requiring three-phase protection with substantial inductive load tolerance at 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.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (250A to 500A), specifically calibrated for circuits with very large inductive loads and significant inrush.
Very High-Capacity 50A Three-Phase Protection with Inductive Tolerance: Ideal for heavy industrial pumps (up to 15kW), large air compressors, industrial HVAC chillers, major conveyors, and heavy machinery.
Inductive Load Capability: Handles very large inrush currents from heavy motor-driven equipment without nuisance tripping.
Heavy Industrial-Grade Protection: Suitable for demanding heavy industrial applications requiring robust three-phase protection at 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 | CB350C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 50 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 50A C-Curve triple pole MCB?
Heavy industrial pumps up to 15kW (20HP), large air compressors, industrial HVAC chillers, major conveyor systems, heavy machine tool main drives, and large industrial refrigeration compressors.
2. Can this 50A C-Curve breaker handle a 15kW three-phase industrial pump?
Yes, it's ideal for 15kW pumps. The C-Curve tolerates starting currents up to 450-500A while the 50A rating provides excellent running protection without nuisance tripping.
3. What is the power capacity of this 50A three-phase C-Curve breaker?
Maximum three-phase load: 34.64kW at 400V. For motor applications, suitable for motors up to 15kW depending on starting characteristics and duty cycle.
4. Why choose C-Curve over B-Curve for heavy industrial motor circuits?
C-Curve (5-10x In) handles starting currents up to 500A where B-Curve (3-5x In) would trip at 250A, making C-Curve essential for heavy industrial motors with high locked-rotor currents.
5. What cable size is mandatory for 50A three-phase heavy industrial motor circuits?
10mm² copper conductor minimum per phase. 16mm² strongly recommended for longer runs to minimize voltage drop during motor starting. All three phase conductors must be same size.
