High-Quality OFAFT Series 4P Miniature Circuit Breaker Factory, Manufacturer

1 / 3

High-Quality OFAFT Series 4P Miniature Circuit Breaker Factory, Manufacturer

The OFAFT Series 4P (Four-Pole) miniature circuit breaker is a full-pole protective device specifically designed for three-phase, four-wire low-voltage distribution systems. The core of its design lies in providing mechanically linked, synchronized interruption capability for all three phase conductors (L1, L2, L3) and the neutral conductor (N). This product not only delivers precise overload and short-circuit protection for wiring and equipment but, more importantly, achieves complete electrical isolation of the circuit, including the neutral. This eliminates safety risks arising from abnormal neutral conductor potential or incomplete fault isolation. It is a key component for application scenarios with stringent requirements for power supply safety and isolation integrity.

Send Inquiry

Product Description

OFAFT Series 2P Miniature Circuit Breaker

2-Pole Protection

OFAFT Series 1P Miniature Circuit Breaker

1-Pole Protection

OFAFT Series 3P Miniature Circuit Breaker

3-Pole Protection

Frequently Asked Questions

What is a Miniature Circuit Breaker (MCB)?

A Miniature Circuit Breaker (MCB) is an automatically operated electrical switch designed to protect low-voltage electrical circuits from damage caused by excess current, overload, or short circuits.

What is the difference between 1P, 2P, and 3P circuit breakers?

1P (Single Pole) protects a single phase line, commonly used for standard 120V/230V single-phase circuits. 2P (Double Pole) protects two lines (phase and neutral or two phases), making it suitable for 240V equipment. 3P (Three Pole) is designed for three-phase power supply systems, widely applied in commercial and heavy industrial machinery.

How does an MCB differ from a standard fuse?

Unlike a fuse, which operates once and must be replaced after melting, an MCB can be manually reset to restore normal operation once the electrical fault is cleared.

What causes a Miniature Circuit Breaker to trip?

MCBs trip primarily due to circuit overload (too many electrical devices running simultaneously) or a short circuit (direct contact between hot and neutral wires).

How do I select the right MCB rating for my application?

Selection depends on the total current demand of the connected circuit, cable cross-sectional area, and the type of load (resistive or inductive). Always ensure the rated current of the MCB does not exceed the safe current-carrying capacity of your wiring.