The 2C63 relays are three pole current detectors designed specifically for CB fail applications. A critical requirement is for a fast reset characteristic which is achieved through the use of air core CT’s. The low burden auxiliary supply makes the relay suitable for continuous energisation. Harmonic filtering is employed to minimize output relay chattering. Fully solid state sensing & measuring circuitry is employed with each phase current setting continuously adjustable on a front panel control.
The 2C63 definite time current check element is initiated when both the current exceeds the user selectable setting & a voltage is applied to the relay initiate status input.