MerCs ME-ELF-AF User manual
02 4047 0777 www.mercs.com.au02 4047 0788
MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2018 V1.1
Earth Leakage Relay
User Manual
ME-ELF-AF
• Adjustable sensitivity
• Adjustable time delay
• LED Status indicators
• Leakage current indication
• Remote test and reset switching
• DIN rail mounting
• Current measurement based on fundamental frequency, prevents nuisance tripping
• Dial adjustment for ease of use
• Robust casing protects the unit from external interference
Features
The MerCs ELR series of earth leakage relays ensures the protection of
electrical installations and persons against direct and indirect contacts.
The ME-ELR-AD model provides real-time leakage current display and
has a 50% pre-fault contact.
DescriptionApplications
• Industrial equipment protection
• Personnel protection from Earth Leakage faults
• Suitable for low voltage distribution protection
Technical Data
Indicator Status
AUX TRIP DELAY
O O O No auxiliary power supply
On O O System normal, no tripping
On O On Trip start, time delay count-
down started
On On O Earth leakage tripped
On On Blink ME-T not connected
Light Indicators
(ii) Leakage indicators
The earth leakage indicators indicate the amount of leakage
current detected and are expressed as percentage of the set
current.
• 10% - leakage current ≥ 10% of set current
• 20% - leakage current ≥ 20% of set current
• 40% - leakage current ≥ 40% of set current
• 60% - leakage current ≥ 60% of set current
• 80% - leakage current ≥ 80% of set current
(i) Status indicators
The light indicators display the status of the system
02 4047 0777 www.mercs.com.au02 4047 0788
MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2020 V1.1
Earth Leakage Relay ME-ELF-AF
Sensitivity Adjustment
The ME-ELR-AF features 2 rotary selector switches for sensitivity (I△n) setting:
(i) 9 position sensitivity selector(e) oer setting range of 30mA, 50mA, 75mA, 100mA, 125mA, 150mA, 200mA, 250mA and 300mA.
(ii) 3 position sensitivity multiplier selector (h) switch oer selection of 1x, 10x and 100x.
Tripping Delay Time Adjustment
• The 9 position time delay selector ( d ) provides additional delay for fault discrimination.
• Selectable delays are: Instantaneous (no delay), 50ms, 100ms, 150ms, 250ms, 350ms, 500ms, 1s and 3s.
Push Button
Reset Button
• The reset button is for resetting the light indicator and the latching trip contact after a trip has occured.
• To reset, press the reset button once.
Test Button
• Press the test button to simulate an earth leakage trip condition.
Remote Control Input
Output Contacts
Remote Test Input
• This digital input is similiar to the TEST push-button. To remotely test the relay, make a connection between terminals 12 and 14
of the relay
Remote Reset Input
• This digital input is to remotely reset the relay when tripped. To reset the relay, make a connection between terminals 13 and 14
of the relay.
Trip Contact
• This is a latching type contact. It operates when tripped.
Safety Contact
• Contact energized when supply is connected and the relay is functioning normally.
Settings
Sensitivity adjustment 0.03 A to 30 A
Delay time adjustment 0 sec to 3.0 sec
02 4047 0777 www.mercs.com.au02 4047 0788
MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2020 V1.1
Earth Leakage Relay ME-ELF-AF
Contacts
Inputs
Indicators
Mechanical
Contact arrangement
1 x latching type with manual reset
1 x safety contact
NC and NO contacts available
Delay time adjustment 5A, 250VAC (cos j =1) contact rating
Contact material Silver alloy
Expected electrical life 100,000 operations at rated current
Expected mechanical life 5 million operations
Remote Test/Reset Inputs N.O. dry input
Auxiliary supply
ME-ELF-AF-110A 90~120 VAC
ME-ELF-AF-24D 21~28 VDC
Rated frequency 50 or 60 Hz
VA rating 3VA typical
Setting accuracy -15% to +0%
Timing accuracy ±5%
A u xiliary supply Green colour LED indicator
Time delay Red colour LED indicator
Trip Red colour LED indicator
Real time leakage current Red colour LED indicator
Mounting method Panel mounting
Front panel Standard DIN96mmx96mm
Approximate weight 0.6kg (exclude ME-T)
Zero-phase Current Transformer
T o operate with ME-T series of current transformer
02 4047 0777 www.mercs.com.au02 4047 0788
MerCs Pty Ltd, 55 Pendlebury Rd, Cardi, NSW, 2285, Australia | 2020 V1.1
Earth Leakage Relay ME-ELF-AF
Connection Diagram
Case Dimensions
Other MerCs Relay manuals
