OEM OFNC Series 3P Miniature Circuit Breaker Factories, Factory

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OEM OFNC Series 3P Miniature Circuit Breaker Factories, Factory

The OFNC series three-pole (3P) miniature circuit breaker is a core overcurrent protection device designed for three-phase AC low-voltage distribution systems. The design and manufacture of this product strictly follow international electrotechnical standards. Its basic function relies on a built-in three-pole integrated mechanical linkage mechanism to provide simultaneous and reliable overload and short-circuit protection for three-phase balanced or unbalanced loads, while also achieving complete electrical isolation of the circuit. As a key component, this circuit breaker effectively prevents damage to three-phase motors, compressors and similar equipment caused by phase-loss operation, and is an important element ensuring stable and safe operation of three-phase power systems in industrial, commercial and infrastructure sectors.

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Product Description

Frequently Asked Questions

What is the primary function of an OFNC Series Miniature Circuit Breaker (MCB)?

The OFNC Series MCB is designed to automatically protect electrical circuits from damage caused by overload currents and short circuits, ensuring operational safety for residential, commercial, and industrial installations.

What is the difference between 1P, 2P, and 4P circuit breakers?

1P (Single Pole) protects one single live wire; 2P (Double Pole) protects both live and neutral lines in single-phase circuits; 4P (Four Pole) protects three live lines and one neutral line in complex three-phase electrical systems.

How do I choose the correct pole configuration for my system?

Choose 1P for basic single-phase switching (e.g., lighting circuits), 2P for main isolation or equipment requiring neutral protection, and 4P for commercial or industrial three-phase distribution networks.

What causes an MCB to trip automatically?

An MCB trips mainly due to thermal overload (excess current flowing over a prolonged duration) or short circuiting (instantaneous surge of high current), preventing electrical fires and device failure.

Are OFNC Series Miniature Circuit Breakers easy to install?

Yes, OFNC Series circuit breakers are designed for standard DIN-rail mounting within standard enclosure boxes, enabling quick snap-on installation and convenient maintenance.