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We quoted you ZW7-40.5 at 1100kg, and that’s just the weight of the unit — the porcelain pillar structure handles the whole thing, with the vacuum interrupter sitting up top in the insulator. The 40.5kV rated voltge matches your 35kV line needs, usually running at 50Hz, and the short-circuit breaking goes up to 31.5kA depending on the configuration you pick.
Most buyers go with the 1250A or 1600A rated current for typical substation work, but we’ve seen some push for 2000A when the load gets heavy — the mechancial lifetime of 10,000 operations is pretty standdard for this class. It basically handles about 20 short-circuit interruptions before you need to check the contacts (the allowable wear thickness is 3mm, which we track during maintenance).
The total breaking time is 0.1 seconds, and the operating sequence runs 0-0.3s-CO-180s-CO — so it’s fine for auto-reclosing in your rural grid application, but it’s not suited for indoor environments or high-humidity locations without additonal weatherproofing. Also, the lightning impulse withstand sits at 185kV peak, which we’ve tested dry and wet.
One thing we don’t always put in the spec sheet: the arc-extinguishing medium is vacuum, so there’s no risk of fire or explosion during fault clearing, unlike older oil-filled units. The 400A rated breaking current for capacitor switching is decent, but if you’ve got a bank with higher inrush, you might need to derate.
Lead time on these is typically 30-45 days (check current stock), and our company offer OEM/ODM with your branding on the nameplate — just send the artwork after the PO. The HS code is 85352100, and we include COA and CCC cerification with every shipment.
The standard rated current options are 1250A, 1600A, and 2000A. For custom values outside these, it depends on the volume, but we can usually adjust the design for OEM orders.
Yes, we provide type test reports covering the full insulation level, including the 185KV peak impulse and the 95KV dry/80KV wet power frequency tests. Those are part of our standard documentation package.
For a standard batch with the 31.5KA breaking current, MOQ is around 5 units, and lead time is roughly 30-45 days after order confirmation. Larger OEM orders can reduce per-unit cost.
You can measure the contact wear using a simple depth gauge or caliper on the contact surface. We do not include a special gauge by default, but we can supply one with the order if requested.
Yes, the 1100kg is for the fixed installation type. For export, each breaker is packed in a reinforced wooden crate with shock-absorbing material, and we can add custom lifting brackets if needed.
