Customizable VD4 Series Medium Voltage Vacuum Circuit Breaker for Substations

We usually see sample units running about 15-20% above the mid-tier price, which for a single VD4 at 12kV with 630A rating lands around $2,800 or so, but the real savings kick in once you're ordering 10 units or more—bulk pricing can drop that to roughly $1,900 per breaker depending on configuration and lead time.

The main limitation you'll bump into is that these aren't designed for outdoor use at all, so if your substation setup is exposed to the elements you'd need a different enclosure, but for indoor air insulated switchboards what it does is handle fault conditions reliably with that vacuum interrupter staying maintenance-free even after thousands of operations.

Basically, the 40.5kV version with 4000A normal current is overkill for most medium-voltage distribution setups, but we've found most buyers go with teh 24kV or 36kV models in the 1250A to 2000A range since that covers transformer protection and cable line duties without paying for capasity you won't use.

fixed version is easier to install and typically ships faster, usually within 20 days or so for standard ratings, while the withdrawable option adds about 2-3 weeks to production but gives you that modular flexibility for maintenance access—check lead time if you're on a tight schedule.

We've handled these breakers for years, and one thing that catches first-time buyers is the weight difference between models; the 73kg unit for 12kV is manageable by two people, but the 365kg 40.5kV version requires a lifting rig and proper handling gear, so factor that into your insallation planning.

For order info, our company can do MOQ of 3 units for custom specs like non-standerd short-circuit breaking currents above 50kA, and every unit ships with a COA and IEC compliance paperwork included; just send your preferred voltage and current ratings along with fixed or withdrawable choice and we'll quote within 48 hours.