Vacuum Circuit Breaker Maintenance Checklist – Keep Your HV VCB Running Reliably in 2026

Regular maintenance is the key to maximizing the lifespan and reliability of your high voltage vacuum circuit breaker (HV VCB). With proper care, Fenarro's VCBs can deliver over 30,000 mechanical operations with minimal downtime.

Here is Fenarro's recommended Vacuum Circuit Breaker Maintenance Checklist for 2026:

Quarterly Checks (Every 3 Months)

• Visual inspection for loose connections, corrosion, or overheating

• Verify operating mechanism smoothness and indicator functionality

• Check auxiliary switches and control circuits

Annual Checks (Every 12 Months)

• Measure contact resistance using a micro-ohmmeter

• Perform timing tests (opening/closing time)

• Conduct vacuum integrity test (Hi-Pot test)

• Inspect for signs of arc chute damage or wear

Condition-Based Triggers

• After more than 2,000 operations

• Following a major fault interruption (>50% rated current)

• When abnormal noise or slow operation is observed

Fenarro's HV VCBs are designed for low maintenance thanks to their sealed vacuum interrupter technology. Following this checklist can significantly reduce unexpected failures and extend equipment life.

Contact Fenarro today.