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Suitable for indoor use.
The Live CB340C Triple Pole MCB is a heavy-duty industrial-grade miniature circuit breaker designed to provide reliable protection for three-phase electrical circuits with large inductive loads. Rated at 40 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 large inductive loads while accommodating the inrush currents typical of large industrial pumps, heavy compressors, and major machinery. With its robust construction and precision thermo-magnetic release, the CB340C ensures equipment protection and operational safety for demanding heavy industrial applications requiring three-phase protection with substantial 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 (200A to 400A), specifically calibrated for circuits with large inductive loads and significant inrush.
High-Capacity 40A Three-Phase Protection with Inductive Tolerance: Ideal for large industrial pumps (up to 11kW), heavy compressors, HVAC chillers, large conveyors, and major industrial machinery.
Inductive Load Capability: Handles large inrush currents from heavy motor-driven equipment without nuisance tripping.
Heavy Industrial-Grade Protection: Suitable for demanding industrial applications requiring robust three-phase protection.
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 | CB340C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 40 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 40A C-Curve triple pole MCB?
Large industrial pumps up to 11kW (15HP), heavy air compressors, industrial HVAC chillers, large conveyor systems, heavy machine tool main drives, and industrial refrigeration compressors.
2. Can this 40A C-Curve breaker handle an 11kW three-phase industrial pump?
Yes, it's ideal for 11kW pumps. The C-Curve tolerates starting currents up to 350-400A while the 40A rating provides excellent running protection without nuisance tripping.
3. What is the power capacity of this 40A three-phase C-Curve breaker?
Maximum three-phase load: 27.71kW at 400V. For motor applications, suitable for motors up to 11kW depending on starting characteristics and duty cycle.
4. Why choose C-Curve over B-Curve for large industrial motor circuits?
C-Curve (5-10x In) handles starting currents up to 400A where B-Curve (3-5x In) would trip at 200A, making C-Curve essential for large industrial motors with high locked-rotor currents.
5. What cable size is recommended for 40A three-phase heavy industrial motor circuits?
10mm² copper conductor minimum per phase. 16mm² recommended for longer runs to minimize voltage drop during motor starting. All three phase conductors must be same size.
