- Versatile single-phase trip 4000 Series vacuum fault interrupter provides reliable single phase circuit protection.
- Single-phase VFIs and accompanying single-phase or three-phase trip relays are powered from internally-mounted current transformers.
- In case of complete loss of power, the relay can trip the VFI on curve within 10 milliseconds.
- Optional single-phase visible disconnects in series with 4000 Series VFIs permits customers to leave their 600 Amp cables attached while testing and grounding.
See Drawing
