China OFA-M1 Series 63 A Molded Case Circuit Breaker Suppliers, Manufacturer

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China OFA-M1 Series 63 A Molded Case Circuit Breaker Suppliers, Manufacturer

In the final feeder and small to medium-capacity circuits at the end of a low-voltage distribution system, protective devices must offer reliable breaking capacity while occupying as little space as possible to fit compact distribution cabinets. The OFA-M1 series OFAM1-63/3300 molded case circuit breaker, with a frame rated current of 63 A, a rated ultimate short-circuit breaking capacity as high as 35 kA, a rated insulation voltage of 690 V and an impulse withstand voltage of 6 kV, is specifically designed for small-capacity distribution circuits in industrial, commercial and infrastructure settings. Manufactured in strict accordance with the GB/T 14048.2 standard, it delivers outstanding electrical protection performance within a small footprint — a trustworthy guardian for low-current feeder circuits.

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Product Description

Frequently Asked Questions

What is a Molded Case Circuit Breaker (MCCB)?

A Molded Case Circuit Breaker (MCCB) is a type of electrical protection device used to safeguard electrical circuits from excessive current, which can cause overloads or short circuits. It features a molded plastic frame housing all operating mechanisms.

How do I choose the correct current rating (125A to 630A) for my application?

Selection depends on the total continuous current load of your electrical system and system voltage. Ensure the rated current (In) matches or slightly exceeds the maximum load current while keeping conductors fully protected according to local electrical codes.

What is the key difference between MCB and MCCB?

MCBs (Miniature Circuit Breakers) are typically rated up to 100A for low-voltage residential or light commercial use, while MCCBs handle higher current ratings (up to 2500A) with adjustable trip settings suited for heavy commercial and industrial environments.

What main protection features do M1 Series MCCBs offer?

M1 Series MCCBs provide dual-protection mechanisms: thermal protection against sustained overcurrent/overload conditions and instantaneous electromagnetic protection against short-circuit currents.

Are these circuit breakers suitable for industrial main distribution boards?

Yes, high-capacity models like the 400A and 630A M1 Series MCCBs are specially designed for main switchboards, power distribution panels, and heavy industrial machinery control units.

How often should MCCBs undergo routine maintenance?

Routine visual inspections, cleaning, and connection tightness checks are recommended annually. Mechanical trip test operations should be conducted periodically according to installation guidelines.