ACB (Air Circuit Breaker)
Use: Low voltage applications (up to ~1 kV, typically 400–690V).
Location: Installed in low-voltage switchboards, MCCs, and distribution panels.
Breaking medium: Air (arc is extinguished in open air chamber).
Application:
Protection of low-voltage distribution systems.
Often used as the main incoming
ACB (Air Circuit Breaker)
Use: Low voltage applications (up to ~1 kV, typically 400–690V).
Location: Installed in low-voltage switchboards, MCCs, and distribution panels.
Breaking medium: Air (arc is extinguished in open air chamber).
Application:
Protection of low-voltage distribution systems.
Often used as the main incoming breaker in LV panels.
Provides protection against overcurrent, short circuit, and earth fault.
Pros: Easy maintenance, reusable after fault clearing, good for frequent operations.
Cons: Bulky, limited breaking capacity compared to higher-voltage breakers.
VCB (Vacuum Circuit Breaker)
Use: Medium voltage applications (typically 3.3 kV – 33 kV).
Location: Installed in medium-voltage substations, industrial plants, and utility distribution networks.
Breaking medium: Vacuum (arc is extinguished in vacuum interrupter).
Application:
Switching and protection of medium-voltage feeders, motors, and transformers.
Suitable for frequent operations due to long electrical life.
Pros: High dielectric strength, compact size, long life, low maintenance.
Cons: Costlier than ACB, not suitable for very high voltages (>33 kV).
✅ In short:
ACB → Low Voltage (≤1 kV), air used for arc quenching.
VCB → Medium Voltage (3.3–33 kV), vacuum used for arc quenching.
Download similar documents 👉🏻 YourFM Document Hub – SOPs, Checklists & Compliance Resources
There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour.
Add my business arrow_forward
Suppliers
Jobs 
News & Magazines 
Events 
Blogs 
Members Lounge
Podcasts 
Support