02 4047 0777
www.mercs.com.au
02 4047 0788
MerCs Pty Ltd, 55 Pendlebury Rd, Cardiff, NSW, 2285, Australia | 2018 V1.1
Earth Leakage Relay
User Manual
ME-ELR-DD
•
Adjustable sensitivity
•
Adjustable time delay
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LED Status indicators
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Leakage current indication
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Remote test and reset switching
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DIN rail mounting
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Current measurement based on fundamental frequency, prevents nuisance tripping
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Dial adjustment for ease of use
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Robust casing protects the unit from external interference
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Serial Number Tracked
Features
The ME-ELR-DD are microprocessors based earth leakage relays designed for measure the
low-level leakage or unbalanced currents due to insulation loss in conductors or equipment to be
protected. A zero phase current transformer is used to sense the leakage current. All conductors
of the circuit to be protected shall go through the ME-T.
For better fault preventive control of the system or equipment, ME-ELR-DD comes with a pre-
fault alarm contact and a positive safety contact. The pre-fault alarm contact is energized when-
ever the leakage current exceed 50% of the sensitivity setting, I n. The positive safety contact is
energized if the relay is power up and function correctly.
Description
Applications
Technical Data
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Industrial equipment protection
•
Personnel protection from Earth Leakage
faults
•
Suitable for low voltage distribution
protection
Auxiliary Supply
ME-ELR-DD-110A
94 ~ 127 VAC
ME-ELR-DD-24A
21 ~ 28 VDC
Rated frequency
50Hz
VA rating
3 VA typical
Setting Ranges
Sensitivity adjustment
30mA, 50mA,
0.10A – 1.00A (Step = 50mA),
1.00A – 5.0A (Step = 1.00A)
Delay time adjustment
0.05s - 0.5s (Step = 0.05s)
Record
Fault record
3 latest tripped fault currents
Storage
Non-volatile memory
Input
Remote reset
N.O. dry contact
Outputs
Trip contact
5A / 250V AC1
Positive safety contact
5A / 250V AC1
Pre-fault alarm contact
5A / 250V AC1
Contact Specification
Contact arrangement
3 latest tripped fault currents
Contact material
Non-volatile memory
Expected electrical life
100,000 at rated current
Expected mechanical life
5x10
6
operations
