R
The Generator Controls Division of 
M060501 Issue 4, revised 09/98 Catalogue section 75
ELD series
EARTH LEAKAGE DETECTOR UNITS
A range of versatile and economical earth leakage detection relays. Each unit is housed in a robust, glass filled nylon case: an aperture in the casing allows the installation cabling to be passed through the integral core balance transformer.
The electronic circuitry combines a stable amplification of the transformer output with an ability to give high sensitivity and fast operating speeds. Detection of an earth fault results in the energisation and latching of the unit's SPCO relay. The unit is reset by momentarily removing the auxiliary supply.
Protection from excessive fault current and supply transients are fitted as standard, as is filtering to allow use with chopped waveform and variable drive applications.
A 'test' facility is supplied in the form of a button, either
Electrical connection on standard units is by a colour coded, 6 way flying lead, with terminal blocks available as an option. Each unit may be mounted on a front panel or back- plate using two 3mm threaded inserts; an optional mounting assembly (part no. EMA) is also available for front access
Standard units include:
ELD2 Basic unit, with 20mS typical trip time. Fast response to earth leakage faults.
ELD4 As ELD2, but with longer trip delays, 80mS to 5 secs. Prevents nuisance tripping in motor protection circuits and allows time discrimination in distribution networks.
ELD5 As ELD4, but with an adjustable trip delay. Available in various time ranges up to 2 seconds.
With options:–
'VS' | Adjustable trip current (via front facia potentiometer.) |
'HT' | High temperature specification (to +60°C ambient). |
'TB' | Screw terminal connectors instead of flying leads. |
'RC' | Special calibration and 1m wiring for use with |
| remote CTs (for RTCs of >125mA). |
Variations on our standard units and options are also available: please call with your requirements.
When ordering, please specify:–
a)Product type number (ELD2, ELD5, etc.)
b)Auxiliary supply voltage
c)Trip current (fixed, or variable range for VS option)
d)System frequency (50, 60 or 400 Hz.)
e)Trip delay time (fixed or variable, according to model)
f)Additional options, if required.
Accessories:–
EMA | Mounting assembly for ELD series. |
Remote CTs A range of remote core balance/current transformers, enabling specially calibrated ELD units to be used with larger cables. Available in a range of sizes, with or without a magnetic screen (see sheet M060101 for full details).
Product Specification
Power supply:
operating voltages (ranges) | 110V AC (100 – 120 V) |
(all for 50/60Hz.) | 230 V AC (200 – 250 V) |
| 415 V AC (380 – 440 V) |
power consumption | < 100mA |
Control: |
|
trip levels | fixed and variable, 10mA to 30A |
trip point accuracy | to BS4293 |
Relay output: | (ratings for resistive load) |
| SPCO contacts, rated |
| 3A @ 250V AC/30V DC, |
| 1A @ 440V AC |
Physical: |
|
operating temperature | standard unit: |
| 'HT' spec.: |
weight (with EMA) | approx. 330 g |
|
|
Connection (standard unit)
L1 | RED | GREEN |
|
| |
|
| WHITE |
| External |
|
| Test | ELD |
| Button | Test |
| BLUE |
|
L2 or N | BLACK | YELLOW |
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| |
Dimensions (mm) |
| |
| EMA | ELD |
| 4 | 31 |
|
| |
| 162 |
|
176 | 136 |
|
| 148 | |
3 |
| 59 |
|
| |
| 25 | 25 |
|
|
Since 1939
Frank W. Murphy Manufacturer
PO Box 470248, Tulsa, Oklahoma 74147, USA Tel: + 1 918 627 3550 Fax: + 1 918 664 6146 email: sales@fwmurphy.com
web: http://www.fwmurphy.com
Frank W. Murphy Ltd. | Frank W. Murphy Ltd. en France | Frank W. Murphy Southern Division | Murphek Pty. Ltd. | |
Incorporating Modex Automation | Tel: +33 (1) 30 76 26 26 Fax: +33 (1) 30 76 39 89 | PO Box 1819, Rosenberg, Texas 77471, USA | 1620 Hume Highway, Campbellfield, Vic. 3061 Australia | |
Church Road, Laverstock, Salisbury U.K. | Direct usine Tel: + 44 1722 410697 | Tel: + 1 281 342 0297 Fax: + 1 281 341 6006 | Tel: + 61 3 9358 5555 Fax: + 61 3 9358 5558 | |
Tel: + 44 1722 410055 Fax + 44 1722 410088 | email: sales@fwmurphy.co.uk | email: sales@fwmurphy.com | email: murphy@macquarrie.com.au | |
Pour service en Français, tél: + 44 1722 410697 | Frank W. Murphy Pte, Ltd. | Murphy Switch of California |
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Murphy de Mexico S.A. de C.V. |
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email: sales@fwmurphy.co.uk | No. 2 Tuas South Street 2, Sprintecs Building | PO Box 900788, Palmdale, California 93590, USA | Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje |
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web: http://www.fwmurphy.co.uk |
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Tel: + 1 805 272 4700 Fax: + 1 805 947 7570 | San Luis Potosí, S.L.P. México 78384 |
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| Tel: + 65 863 1398 Fax: + 65 863 0208 | email: sales@murphyswitch.com | Tel: + 52 48 206264 Fax: + 52 48 206336 |
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| email: fwmsales@fwmurphy.com.sg | web: http://www.murphyswitch.com | email: murmexsl@sanluis.podernet.com.mx |
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