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Suitable for indoor use.
The Live CB320C Triple Pole MCB is a robust industrial-grade miniature circuit breaker designed to provide reliable protection for three-phase electrical circuits with significant inductive loads. Rated at 20 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 significant inductive loads while accommodating the inrush currents typical of larger pumps, compressors, and industrial machinery. With its robust construction and precision thermo-magnetic release, the CB320C ensures equipment protection and operational safety for industrial and commercial 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 (100A to 200A), specifically calibrated for circuits with significant inductive loads and inrush.
High-Capacity 20A Three-Phase Protection with Inductive Tolerance: Ideal for larger pumps (up to 5.5kW), air compressors, HVAC systems, conveyors, and industrial machinery.
Inductive Load Capability: Handles substantial inrush currents from motor-driven equipment without nuisance tripping.
Wide Application Range: Suitable for industrial, commercial HVAC, and manufacturing applications requiring 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 | CB320C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 20 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 20A C-Curve triple pole MCB?
Three-phase pumps up to 5.5kW (7.5HP), air compressors, commercial HVAC units, conveyor systems, refrigeration compressors, industrial fans, and light machine tool main drives.
2. Can this 20A C-Curve breaker handle a 5.5kW three-phase pump?
Yes, it's ideal for 5.5kW pumps. The C-Curve tolerates starting currents up to 180-200A while the 20A rating provides excellent running protection without nuisance tripping.
3. What is the power capacity of this 20A three-phase C-Curve breaker?
Maximum three-phase load: 13.86kW at 400V. For motor applications, suitable for motors up to 5.5kW depending on starting characteristics and duty cycle.
4. Why choose C-Curve over B-Curve for larger pump and compressor circuits?
C-Curve (5-10x In) handles starting currents up to 200A where B-Curve (3-5x In) would trip at 100A, making C-Curve essential for larger motor circuits with significant locked-rotor currents.
5. What cable size is recommended for 20A three-phase motor circuits?
2.5mm² copper conductor minimum per phase. 4mm² recommended for longer runs to minimize voltage drop during motor starting. All three phase conductors must be same size.
