The Live CB150D Single Pole MCB is a premium heavy-duty industrial miniature circuit breaker engineered to provide robust protection for the most demanding high-power single-phase electrical circuits with extreme inrush currents. Rated at 50 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 a powerful 10kA breaking capacity, making it suitable for installations with high prospective short-circuit currents near main distribution points. The D-curve characteristic (10-20x In) is specifically designed for applications with massive momentary startup currents, ensuring the breaker tolerates these extreme surges while maintaining full protection against overloads and short circuits. With its rugged construction and precision thermo-magnetic release, the CB150D ensures equipment protection and operational safety for the most demanding heavy industrial applications.

Key Features of Live CB150D 50A 1P MCB

• High 10kA Breaking Capacity: Powerful fault current interruption for installations with high prospective short-circuit currents up to 10,000 amps.

• D-Curve Characteristic: Trips instantaneously at 10-20 times rated current (500A to 1000A), specifically engineered for applications with extreme inrush currents.

• Very High-Capacity 50A Protection with Extreme Surge Tolerance: Ideal for large single-phase industrial motors, heavy transformers, large welding equipment, and heavy machinery with massive startup currents.

• Single Pole Configuration: Protects one phase conductor for single-phase 230V heavy industrial circuits.

• Industrial Heavy-Duty Focus: Prevents nuisance tripping where standard B/C curves would fail due to extreme inrush from heavy industrial equipment.

• Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response.

• 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 in demanding industrial environments.

• Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.

Technical Specifications

Frequently Asked Questions (FAQs)

1. What specific heavy industrial applications require a 50A D-Curve single pole breaker?
Large punch presses (15HP+), heavy-duty industrial compressors, large injection molding machines, industrial braking systems, and massive conveyor drives with startup surges exceeding 700A.

2. How does the 1000A surge tolerance benefit large motor starting?
A 15HP single-phase motor can draw 700-800A during locked rotor conditions. The 1000A magnetic trip threshold prevents nuisance tripping during this critical startup phase while maintaining fault protection.

3. Can this breaker handle the inrush from a large industrial UPS system?
Yes, large UPS systems and battery banks for industrial backup can draw extreme inrush currents during startup. The D-Curve characteristic accommodates these surges without interruption.

4. What is the maximum transformer capacity this 50A D-Curve can support?
Suitable for large isolation transformers up to 15kVA and welding transformers up to 18kVA, handling the massive magnetizing inrush (up to 25x normal current) during energization.

5. Why is 10kA breaking capacity critical for 50A D-Curve industrial applications?
50A D-Curve breakers are typically installed in heavy industrial settings near main transformers where fault currents can reach 10kA. This rating ensures the breaker can safely interrupt maximum fault current without catastrophic failure.