What is the difference between MCB and MCCB?

Electrical
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MCB - Miniature Circuit Breaker

MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit.

Normally it is used where normal current is less than 100 A

MCCB - Moduled Case Circuit Breaker

MCCB moduled case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.

Under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A

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Precise and straight to the point! Thanks for sharing.

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MCB vs MCCB: Key Differences

Parameter MCB (Miniature Circuit Breaker) MCCB (Molded Case Circuit Breaker)
Full Form Miniature Circuit Breaker Molded Case Circuit Breaker
Purpose Protects low-current electrical circuits from overloads and short circuits Protects medium- and high-current circuits from overloads, short circuits, and earth faults (with accessories)
Current Rating Typically 0.5 A to 125 A Typically 16 A to 2500 A or higher
Voltage Rating Up to 415 V AC (typical) Up to 1000 V AC (model dependent)
Breaking Capacity 6 kA to 16 kA (typical) 25 kA to 150 kA or higher
Trip Setting Fixed, non-adjustable Adjustable thermal and magnetic trip settings
Protection Type Overload and short-circuit protection Overload, short-circuit, and optional earth fault protection
Installation DIN rail mounted Panel or switchboard mounted
Physical Size Compact and lightweight Larger and more robust
Applications Residential homes, offices, lighting, and small commercial loads Industrial plants, substations, motor feeders, generators, and large commercial buildings
Accessories Limited accessories Supports shunt trip, undervoltage release, auxiliary contacts, motor operator, communication modules, etc.
Maintenance Minimal maintenance Periodic inspection and testing recommended
Selectivity Limited coordination options Better selectivity and coordination with other protection devices
Cost Lower Higher due to advanced features
Interrupting Fault Current Suitable for lower fault levels Suitable for high fault levels
Customization Standard fixed characteristics Wide range of adjustable protection settings
Typical Standards IEC 60898-1 IEC 60947-2
Best Used For Domestic and light commercial electrical distribution Industrial power distribution and heavy-duty electrical systems