A Din rail mounted current sensing relay dedicated for DC earth fault monitoring, such as insulation deterioration on a DC system. The unit is supplied complete with a dedicated DC Earth Fault CT type FOX21.CTD, this allows the relay to have two switchable earth fault ranges of 1-20mA and 10-200mA. The unit is fitted with four LED's to aid status diagnosis
Please Note - The CT comes with the Earth Fault Relay. The CT cannot be ordered separately as they are matched and calibrated to the Earth Fault Relay
- Green LED = Auxiliary supply voltage healthy
- Red LED = Output relay energised
- Top Amber LED = Positive leg earth fault
- Bottom Amber LED = Negative leg earth fault
- Both Amber LED's = Open circuit or short circuit between CT & relay (also if Test function is used)
The amber earth fault LED's will start to illuminate at either 1mA or 10mA (depending on which range has been set), but the output relay will not de-energise until the setpoint has been reached, plus any delay “ON” time set, which is adjustable 0.1-10secs. The output relay is fail safe, ie energised when healthy, de-energises on earth fault.
After tripping on an earth fault and the fault level starts to fall below the setpoint it has to fall for a further 2% (hysteresis) plus any delay “OFF” time set before the output relay energises again. This is “AUTO RESET” . However, should the optional latch facility be utilised via an NC link between terminals Y1 & Y2 the NC link will need to be opened or the auxiliary supply removed to facilitate a reset, providing the fault is below the setpoint level plus hysteresis, “MANUAL RESET”.
The relay is also fitted with a relay Test input between terminals Y3 & Y4 via a NO input
Please Note: The YWRI.DEF and its associated CT are designed to monitor insulation breakdown. It must not be used as a safeguard for life protection.
We carry a selection of the full range of options listed in the datasheet. Non-stocked configurations may be available but may be subject to minimum order quantities or different pricing. Contact Us for more information