China OFIS-BH Series 4P Miniature Circuit Breaker Factories, Suppliers

1 / 3

China OFIS-BH Series 4P Miniature Circuit Breaker Factories, Suppliers

The OFIS-BH Series 4P (Four-Pole) Miniature Circuit Breaker is a full-pole protective device specifically engineered for three-phase, four-wire (TN-S, TN-C-S systems) low-voltage distribution circuits. Its core design principle is to provide simultaneous interruption capability for all three phase conductors (L1, L2, L3) and the neutral conductor (N), achieving complete circuit isolation during a fault. This not only effectively severs fault current but also eliminates safety hazards arising from neutral conductor faults or potential shifts. It provides assurance for applications demanding the highest level of electrical isolation and system integrity.

Send Inquiry

Product Description

Related Products

OFIS-BH Series 3P Miniature Circuit Breaker

OFIS-BH Series 1P Miniature Circuit Breaker

OFIS-BH Series 2P Miniature Circuit Breaker

Frequently Asked Questions

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

A 1P (single-pole) circuit breaker controls and disconnects one live wire, suitable for single-phase 120V/230V circuits. A 2P (double-pole) breaker protects two live wires simultaneously for higher voltage loads. A 3P (three-pole) breaker disconnects three phase wires concurrently, designed for three-phase commercial and industrial machinery.

What protection functions do OFIS-BH series miniature circuit breakers provide?

The OFIS-BH series miniature circuit breakers provide essential protection against overcurrent, electrical overload, and short circuits, protecting cables and equipment from thermal damage and risk of fire.

How do I select the right pole rating for my installation?

Selection depends on your power network configuration. Use 1P for basic single-phase branch circuits, 2P for single-phase systems requiring neutral isolation or higher voltage equipment, and 3P for heavy motor loads, HVAC systems, or three-phase power distribution networks.

Where are OFIS-BH series circuit breakers typically applied?

They are widely applied in industrial control panels, commercial building distribution boards, residential load centers, and OEM machinery protection where precise overcurrent protection is critical.

What maintenance is needed for miniature circuit breakers?

Miniature circuit breakers require minimal maintenance. Periodic visual checks to ensure connections remain tight, clean environment free of excess dust, and occasional manual tripping test ensure reliable long-term functionality.