What are the key differences in current rating, adjustability, and breaking capacity?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

(Unlock A.I Detailed Solution for FREE)

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

The primary differences between MCBs and MCCBs are their size, capacity, and features.MCCBs are larger, more robust, and more versatile.

Here’s a direct comparison of their key technical specifications:

Feature	MCB (Miniature Circuit Breaker)	MCCB (Molded Case Circuit Breaker)
Current Rating	Lower, fixed ratings. Typically available from 0.5A up to 125A.	Much higher ratings. Typically ranges from 100A up to 2500A.
Adjustability	Not adjustable. The thermal and magnetic trip settings are factory-set (e.g., Type B, C, or D).	Adjustable. Most MCCBs have settings that can be adjusted for both overload (thermal) and short-circuit (magnetic) trip points. This allows for precise protection and coordination.
Breaking Capacity (kA)	Lower. Standard for residential use is 6 kA and for commercial use is 10 kA.	Significantly higher. Ranges from 16 kA up to 200 kA, making them suitable for industrial applications with high potential fault currents.
Application	Final distribution circuits, lighting, and standard socket outlets in residential and light commercial buildings.	Main power distribution, protecting large motors, capacitor banks, and industrial machinery.
Size & Mounting	Small, compact, and typically mounted on a standardized DIN rail.	Larger, bulkier, and usually bolted into a main switchboard or panel.