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We've been seeing a lot of failures with older oil-based units in these factory retrofits, so we went with vacuum arc-extinguishing type instead—it basically handles the arcing much cleaner and the contact life is significantly better, especially at the higher end of the 1250A to 4000A range we're looking at for the main line.
The model we're ordering is the KJ-MMT, and it's 7.2kV up to 36kV, which covers our substation feeds and the new motor control centers without having to spec a different unit for each voltage level, and the breaking capasity tops out at 50kA for the 4000A frame which is tighter than most conventional breakers we've tested.
ISO9001-2000 is the cert they're listing, but we usually have stock on the manual type and the electric type is a 3-4 week lead time (check with procurement if that's acceptable for the Phase 2 line install). Teh fixed installation version is easier to wire, but the insert option gives you the flexibility to swap a unit without pulling the whole enclosure apart—most buyers go with the insert for new builds.
Also, it's a 3-pole ACB structure, so it's not meant for DC bus work or any kind of high-frequency switching, but for standard 50/60Hz distribution it's fine, and the mechanicla life is rated at 30,000 operations or so before you'd need to look at the contacts.
One thing the spec sheet doesn't flag is that the vacuum interrupter is old-school design—it's not a modern spring-charged mechanism, so the closing time is a bit slower than what you'd get from a newer SF6 unit, but for our factory's 10kV ring main that's not an issue and the cost difference is substantial.
We typically start at 10 units for standard configurations, but if you need a custom spec or lower volume, just reach out and we can talk it through.
For a batch of 50 units with a custom 24kV setup, lead time is usually around 30-45 days from order confirmation, depending on material availability.
Yes, we can share our ISO9001-2000 certificate and the routine test reports for the vacuum interrupter. Just let us know what format you need.
Fixed installation means the breaker is bolted directly into the panel, while insert (draw-out) style lets you pull the breaker out for maintenance without disconnecting wiring. Both are available on the KJ-MMT.
Keep it in a dry, clean environment with temperature between -25°C and 55°C. Avoid direct sunlight and humidity—ideally store it in its original packaging until installation.
