Moulded-case circuit breaker selection depends on more than current rating. Breaking capacity, poles, trip protection and the installation's electrical characteristics must all be checked.
Core MCCB selection parameters
Start from the system and protection requirement rather than attempting to match only the physical breaker size.
- Rated operational voltage
- Number of poles
- Required current rating
- Breaking capacity
- Trip-unit type and settings
- Required auxiliaries and accessories
Breaking capacity matters
The MCCB breaking capacity must be appropriate for the prospective short-circuit level at the point of installation. This is an engineering parameter and should be confirmed from the project design or existing approved schedule.
Replacement enquiries
For existing switchboards, provide the complete breaker reference, trip-unit details, pole configuration and clear photographs. Accessories and mounting arrangements can affect whether a replacement is directly compatible.
Frequently asked questions
Is a higher ampere MCCB automatically suitable?
No. Current is only one parameter. Breaking capacity, trip protection, poles and system requirements must also be checked.
What should I send for an NSX replacement?
Send the complete MCCB reference, trip-unit reference, photographs and required quantity.
Can Al Qarar quote MCCBs from a BOQ?
Yes. Send the BOQ with ratings, quantities and any mandatory consultant or project requirements.
Have a Schneider Electric part number or BOQ?
Send the complete references, quantities and delivery requirement to Al Qarar Technical Supplies in Oman.
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