China OFIS-125A Series | 4-Pole Miniature Circuit Breaker Factory, Supplier

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China OFIS-125A Series | 4-Pole Miniature Circuit Breaker Factory, Supplier

The OFIS-125A Series 4P (4-Pole) Miniature Circuit Breaker is an essential protection device engineered for 3-phase, 4-wire low-voltage distribution systems. Its primary function is to provide simultaneous overload and short-circuit protection for all three line conductors (L1, L2, L3) and the neutral conductor (N), while ensuring complete and safe circuit isolation. This design is critical for applications requiring prevention of neutral point shift, guaranteed safety during maintenance, or protection of 3-phase equipment sensitive to voltage imbalance. It is widely used in scenarios demanding the highest levels of safety and system integrity.

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Product Description

Frequently Asked Questions

What is the primary function of the OFIS-125A Series Miniature Circuit Breaker?

The OFIS-125A Series Miniature Circuit Breakers (MCB) are designed to automatically switch off electrical circuits during overload or short-circuit conditions, protecting equipment, wiring, and preventing electrical fires in industrial, commercial, and residential applications.

What are the differences between 1P, 2P, and 3P circuit breakers?

1P (Single Pole) protects one single-phase wire, ideal for standard household 220V/110V circuits. 2P (Double Pole) disconnects both live and neutral lines for enhanced safety. 3P (Three Pole) is designed for three-phase power systems commonly used in heavy industrial equipment and machinery.

What does the "C63" designation mean on the 1P circuit breaker?

"C" indicates the tripping characteristic curve, suitable for general commercial and residential loads with moderate inductive surges. "63" represents the rated current capacity of 63 Amperes.

Are these miniature circuit breakers easy to install?

Yes, the OFIS-125A series is designed for standard DIN rail mounting, allowing fast, safe, and efficient installation within standard distribution boards and consumer units.

How quickly does an MCB trip under fault conditions?

Under short-circuit conditions, the magnetic trip mechanism reacts instantaneously (typically within milliseconds) to clear the fault and safeguard connected electrical networks.