RXBA 4 is a static, three-phase relay that detects fuse failures by comparing the voltages on both sides of the fuse in each phase.
RXBA 4 detects single-, two- or three-phase fuse failures in less than 8 ms, and is used to block high-speed distance protection relay tripping in case of fuse failure.
It can also be used to block other protection relays where fuse failure will cause unnecessary tripping such as undervoltage relays, underimpedance relays, etc.
Main Features:
- Detects failures on both main and pilot fuse groups
- Can be used with miniature circuit breakers
- Contact outputs for blocking and alarm of failures on main and pilot fuse group
- Needs no auxiliary supply
- LED indication of faulty fuse