EARTH FAULT RELAY

Din rail mounted current sensing relay dedicated for earth fault monitoring in conjunction with a core balance CT. The YWRI/EF has three adjustable earth fault input ranges selectable via terminal tapings 5-100mA, 0.05-1A, 0.5- 10A. On connection of the auxiliary supply the green LED illuminates. Exceeding the set earth fault level and after the adjustable tripping time has elapsed, the output relay energises and the red LED illuminates. The YWRI/EF has a fixed hysteresis of 5% of the set value, should the earth fault level fall below the set value less 5%, the output relay will de-energise and the red LED will extinguish (auto reset). However, should the optional latch facility be utilised between terminals Y1 and Y2 via a remote NC contact, the NC contact has to be opened or the auxiliary supply removed to reset the unit (manual reset). The YWIR/EF via terminals Y2 and B1 also has a remote test input operated by a NO contact.

Auxiliary supply:
400VAC, 230VAC, 110VAC, 48VAC, 24VAC
48VDC, 24VDC +/-15% (50/60Hz)

Isolation: Via transformer

Power consumption: Max 3VA

Earth fault ranges:
5-100mA
50mA-1A
0.5-10A

Input impedance:
100mA range 1 KOhm
1A range 100 Ohms
10A range 10 Ohms

Hysteresis: Fixed at 5% of set value (other values on request)

Tripping delay: Adjustable 0.1-10secs (-0% +30%)

Repeat accuracy:
±2% at constant ambient
To VDE0435 ±5%

Operating temperature: -10°C to +65°C

Response time:
100mSec on make
200mSec on break

Output relay:
Max power 2200VA, 30W DC
250VACDC @ 10A AC, 1A DC

Mechanical life:
30 Million ops
Max 600 ops/hr

Electrical life: 200 000 at 2200VA (resistive)

Max cable size: 4mm

CE marked: 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

A core balance current transformer must be used with our earth fault relay type YWRI/EF and must be selected from the options below. One core balance current transformer is required per YWRI/EF, all conductors must pass through the CT. Core balance CT's are not sensitive to polarity either on the primary or secondary. However, the primary conductors must all pass in the same direction together.

Specifications:

Conforms to: IEC44-1, IEC185, BS7676

Rated system voltage: 720VAC

Insulation: 3KV

Frequency range: 50/60Hz

Max secondary cable size: 2.5mm

The YWRI/EF and its associated CT’s are designed to monitor insulation break down.

IT MUST NOT BE USED AS THE MAIN SAFEGUARD FOR LIFE PROTECTION

TYPE

YWRI/EF

AUXILIARY SUPPLY OPTIONS

400VAC
230VAC
110VAC
48VAC
24VAC
48VDC
24VDC

A core balance CT from the four options listed must be used with this product, do not use any other type of CT or manufacturer of CT’s.