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Many people often get confused when understanding the difference between MCB and MCCB. Both are circuit protection devices used in electrical systems, but they serve different purposes based on their ratings and applications. |
🔌 What is MCB?
The MCB operates by sensing excessive current and tripping the circuit to prevent damage. It has two contacts – one is fixed and the other is movable.
Key Features of MCB:
- Rated for lower current applications (typically up to 100A)
- Non-adjustable trip settings
- Used in residential and light commercial systems
⚡ What is MCCB?
MCCB stands for Molded Case Circuit Breaker. It is a type of electrical protection device that protects an electrical circuit from overloading and short-circuiting.
MCCBs can be operated manually and are equipped with bimetallic strips and temperature-sensitive elements that enable automatic tripping under fault conditions. MCCBs offer both overcurrent and over-temperature protection.
Key Features of MCCB:
- Rated for higher current applications (up to 1000A or more)
- Trip settings are often adjustable
- Used in industrial and large commercial systems
🔍 Difference Between MCB and MCCB
| Characteristics | MCB | MCCB |
|---|---|---|
| Rated Current | Up to 100 Amperes | Up to 1000 Amperes |
| Trip Characteristics | Not adjustable | Adjustable |
| Operation | Thermal / Thermal-Magnetic | Thermal / Thermal-Magnetic |
| Interrupting Capacity | Up to 10 kA | 10 kA to 100 kA |
| Operating Current Range | 0.5A to 63A | 25A to 630A |
| Load Capacity | Small loads | Large loads |
| Under Voltage Trip | No | Yes |
| Shunt Trip | No | Yes |
| Auxiliary Alarm Contact | No | Yes |
💡 Conclusion
Both MCB and MCCB are essential for protecting electrical circuits, but they differ significantly in terms of current rating, trip characteristics, and application areas.
While MCBs are suitable for small-scale applications like homes and small offices, MCCBs are designed for heavy-duty use in industrial and commercial setups.