Factory Supply VS1 Medium Voltage Vacuum Circuit Breaker for Substations

So you're looking at medium voltage switching for substations, and the VS1 series is what we typically supply for those 6kV, 12kV, and 24kV setups, with a rated current range from 630A all the way up to 4000A depending on your feeder requirment — it's basically a vacuum bottle design that handles the arc extinguishing without any oil or gas.

We've run these through a lot of field applicaion, and what it does is combine the operating mechanism right into the breaker body so you don't have separate linkages or extra hardware; that mechanical durability is 20,000 operations, which is pretty much what most substation buyers expect for frequent switching.

The short circuit breaking current runs from 20kA to 40kA, and you'll see the power frequency withstand voltge at 42kV for the 12kV class or up to 65kV for the 24kV class, with lightning impulse at 75kV or 125kV respectively — just keep in mind this isn't designed for outdoor use despite its ruggedness, as the fixed and withdrawable instalation options are strictly indoor.

Most people ask about the operating voltage, and our company offer both AC and DC at 110V or 220V, though the asynchronous time between poles is tight at under 2ms, and contact bounce stays within that same range, which matters for arc consistency; also, the average closing speed of 0.6-0.8m/s is smoother than some older designs we've seen.

A detail you might not think of is epoxy resin insulation on the poles — actually, it holds up well in humid conditions but can be sensitive to sharp impacts during handling, so use the custom color option (white or gray by default) mostly for panel aesthetics, not performance.

We usually have stock on the 12kV 630A units in white, but for the 24kV or high-current 4000A variants the lead time is about 4-6 weeks or so, and our company can provide CE, CB, and IEC certifications with the shipment — the ISO9001 comes standard, of course, though you'll want to confirm the specific impulse test levels if your substation is at altitude.