Type XR relays are developments for specific applications of the AR relay range. They are electro-mechanical relays with a consistent positive action, a long service life and complying with BS142.
XR101 - This relay is supplied with a loose 1500 ohm resistor for wiring in series with the coil. The resistor should be mounted vertically on a steel cubicle or switchgear compartment side sheet. XR102 - This relay requires a 200 ohm resistor to be wired in series with the coil. As the resistor is a requirement of the overall intertripping scheme detailed by ESI 41-15 Part 5, it is NOT SUPPLIED with the relay.