RXBA - Fuse supervisory relay
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. It 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.
RXBA 4 can also be used to block other protection relays where fuse failure will cause unnecessary tripping such as undervoltage relays, underimpedance relays, etc.
- 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
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