VS1-12/1250-31.5 Vacuum Circuit Breaker with 30000 Cycles Mechanical Endurance

30,000 cycles sounds impressive until you realize that’s under ideal lab conditions—real-world mechanical stress form frequent switching will knock that down to maybe 25,000 or so, but for most medium-voltage distribution setups, that’s still more than enough headroom before any contact wear becomes a concern.

We’ve seen these hold up fine in factories where they’re cycled daily for line isolation, though the electric operation means you’ll want stable 110V DC supply or you risk sluggish opening at lower end of the -10°C rating.

Basically, teh 12kV rated voltage and 31.5kA breaking capacty cover most 50Hz switchgear panels we supply to, and the withdrawable version makes maintenance a lot easier than fixed—just pull the truck out and swap in a spare while the original gets serviced (lead time on spares is usually 4-6 weeks, but check stock).

It’s not suited for high-humidity coastal environments without additional enclosure protection—the ≤95% RH spec is daily average, not peak condensation, so you’ll see tracking issues if mounted outdoors without a weatherproof housing.

1250A is the sweet spot for most industiral feeders, but if you need 2000A or 3150A, the same frame handles it with different contact assemblies; just confirm your busbar clearance because the fixed version takes up less depth than the withdrawable by about 150mm.

Anyway, we’ve got VDE and CCC certs on file, and the COA for each unit includes a mechanical endurance test report—just request it with your PO if you need it for your qualiy audit.