Difference Between VCB and ACB in Electrical Systems
VCB (Vacuum Circuit Breaker) and ACB (Air Circuit Breaker) are both circuit breakers used for electrical protection, but they differ in their working principles and applications.
1. VCB (Vacuum Circuit Breaker)
Uses vacuum as the arc-quenching medium.
Suitable for medium to high voltage applications (11kV to 33kV or higher).
Requires low maintenance and has a long lifespan.
Can be used in both indoor and outdoor installations.
Minimal arcing, which reduces wear and tear on contacts.
2. ACB (Air Circuit Breaker)
Uses air as the arc-quenching medium.
Designed for low voltage applications (415V to 690V).
Mostly used in industrial panels and low-voltage distribution boards.
Provides protection against short circuits and overloads.
Commonly used for generator and transformer protection.
Key Differences Table
Feature
VCB
ACB
Arc Quenching Medium
Vacuum
Air
Voltage Range
11kV33kV or higher
415V690V
Installation
Indoor /Outdooг
Indoor
Maintenance
Low
Higher
Application
High voltage substations, industrial setups
Low voltage panels, generator protection
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