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Installation must be carried out by a qualified electrician.
Ensure power is switched off before installation.
Suitable for indoor use.
The Live CB120D Single Pole MCB is a specialized heavy-duty miniature circuit breaker engineered to provide reliable protection for demanding single-phase industrial circuits with extremely high inrush currents. Rated at 20 Amps with a D-curve tripping characteristic, this 1-pole breaker safeguards the phase conductor on AC systems up to 230V at 50/60Hz frequency. It features an enhanced 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 surges while maintaining full protection against overloads and short circuits. With its robust construction and precision thermo-magnetic release, the CB120D ensures equipment protection and operational safety for specialized industrial applications.
High 10kA Breaking Capacity: Enhanced fault current interruption capability for installations with higher prospective short-circuit currents.
D-Curve Characteristic: Trips instantaneously at 10-20 times rated current (200A to 400A), specifically designed for applications with extremely high inrush currents.
High-Power 20A Protection with Extreme Surge Tolerance: Ideal for large single-phase motors, industrial transformers, welding equipment, and heavy machinery with very high startup currents.
Single Pole Configuration: Protects one phase conductor, standard for single-phase 230V industrial circuits.
Industrial Heavy-Duty Focus: Prevents nuisance tripping where standard B/C curves would fail due to extreme inrush from industrial equipment.
Precision Thermo-Magnetic Release: Thermal bimetal strip for overload protection and magnetic solenoid for short-circuit response.
Superior Electrical Isolation: 4000V impulse withstand rating and 500V insulation voltage.
Extended Operational Life: 8,000 electrical operations for long-term reliability in demanding industrial environments.
Professional Installation: DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Model Number | CB120D |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| 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 |
| Operating Temperature | -5°C to +40°C |
| Calibration Reference | 30°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standard | IEC 60898-1 |
1. What are the main applications for the CB120D 20A 1P MCB?
Large single-phase motors up to 5HP, industrial control transformers, welding machines, plasma cutters, large solenoid banks, and circuits with extreme inrush currents up to 400A.
2. What motor power can this 20A D-Curve breaker handle?
Single-phase motors up to 5HP (3.7kW) depending on starting characteristics. D-Curve tolerates starting currents up to 8-10x FLC without nuisance tripping.
3. Why choose D-Curve over C-Curve for 20A industrial applications?
D-Curve (10-20x In) handles extreme inrush where C-Curve (5-10x In) would trip. Essential for equipment with starting surges exceeding 200A.
4. What transformer size can this 20A D-Curve breaker support?
Suitable for control and isolation transformers up to 4kVA, handling high magnetizing inrush during energization without nuisance tripping.
5. What cable size is recommended for 20A D-Curve industrial circuits?
2.5mm² copper conductor minimum. 4mm² recommended for longer runs and industrial environments. Terminals accept up to 16mm².
