DC Earth Fault Relay Complete With DC Earth Fault CT 18-75VDC Powered

Available for backorder
  • Weight
    0.07 kg
  • SKU

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

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  • $211.67

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 

  • Auxiliary supply: 18-75 VDC (other options available)
  • Power consumption: Max 3 W
  • Earth Fault ranges: 1-20 mA / 10-200 mA switchable
  • Hysteresis: Fixed at 2% of set value (other values on request)
  • Tripping delay “ON”: Adjustable 0.1-10 s
  • Tripping delay “OFF”: Adjustable 0.1-10 s
  • Repeat accuracy: +2% at constant ambient
  • FOX.21CTD internal dia: 21 mm
  • Max distance between CT and relay: 100 m (200 m loop in total)
  • Recommended cable: 1.5 mm tri rated
  • Operating temperature: -20 C to +65 C
  • Output relay: Max power 2200 VA, 30 W DC 250 VAC/DC @ 10 Amps AC1, 1 Amp DC1
  • Mechanical Life: 30 Million ops
  • Electrical life: 200K at 2200VA (resistive)
  • Max cable size: 4 mm
  • CE marked: Yes
  • RoHS compliant: Yes
  • In accordance with: EN61000-6-1: 2007, EN61000-6-3: 2007, EN61010-1: 2002
  • Housing Material: Polycarbonate, Auto extinguishable to UL 94 V-0

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.