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The Live CB140C Single Pole MCB is a heavy-duty high-capacity miniature circuit breaker engineered to provide reliable protection for very high-power single-phase electrical circuits in industrial and large commercial applications. Rated at 40 Amps with a C-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. It delivers precise protection against overloads and short circuits, making it the ideal choice for heavy industrial circuits, large welding machines, high-power commercial equipment, and applications where significant inrush currents occur. With its robust construction and precision thermo-magnetic release, the CB140C ensures equipment protection and operational safety in the most demanding high-power applications.
High 10kA Breaking Capacity: Enhanced fault current interruption for installations with higher prospective short-circuit currents.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (200A to 400A), ideal for very high-power circuits with significant inductive loads.
Very High-Capacity 40A Protection: Perfect for large industrial welding machines, high-power commercial cooking equipment, and heavy-duty industrial machinery.
Single Pole Configuration: Protects one phase conductor for single-phase 230V high-capacity industrial circuits.
Industrial Heavy-Duty Rating: 40A suits the most demanding applications in heavy industry, large commercial kitchens, and workshops.
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 | CB140C |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 1 Pole (1P) |
| 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 |
| 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 specific industrial equipment requires a 40A C-Curve single pole breaker?
Large single-phase welding machines (up to 9kW), industrial conveyor drives, heavy-duty commercial mixers, large compressors, and high-power injection molding machines.
2. Can this 40A breaker supply power to a large commercial kitchen?
Yes, it's ideal for large commercial ovens (8-9kW), industrial dishwashers, high-power griddles, and heavy-duty food processing equipment requiring 40A single-phase supply.
3. What is the maximum continuous load recommended for this 40A breaker?
For continuous operation (3+ hours), follow the 80% rule: maximum 32A continuous load (7.36kW). This prevents thermal stress and ensures long breaker life.
4. Why is 10kA breaking capacity essential for 40A industrial circuits?
40A circuits are typically near main distribution where fault currents can reach 10kA. The 10kA rating ensures the breaker can safely interrupt maximum fault current without failure.
5. What cable size is mandatory for 40A high-power circuits?
10mm² copper conductor minimum for safety and compliance. 16mm² recommended for longer runs or high ambient temperatures. Terminals accept up to 16mm² directly.
