
IDMTL Earth Fault Relay – REF052n
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IDMTL & DTL
Relay
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MTB
ANSI 86 Lockout
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Self-diagnostic &
Auto Restore -
Fault & Operation Record
Latch Relay / RS485

Self-Diagnostic & Auto Restore
The self-diagnostic feature operates continuously. When an internal fault is detected, the relay will attempt to resolve the fault. Failing which, a fault alarm will be generated and output contact will be activated.

Built for Safety
- Flame Retardant material tested against UL94v-0 fire standards
- MTB ANSI 86 Lockout Relay
- Enhanced test trip function prevents accidental activation of the relay’s ‘Test Trip’ command

MTB
MTB or Mechanical Trip Button is a proprietary lockout feature that prevents an operator from re-energizing the circuit breaker before isolating the fault and resetting the MTB.
When activated, the MTB latches the output contacts and continues to indicate the presence of a fault until it is cleared, and the relay reset. All these are achieved without the need for an auxiliary power supply to the relay.
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Tripping Events Recording
Reduces the time needed for fault tracing with up to 20 tripping events recorded. Parameters recorded include type and magnitude of fault, date and time stamping.

Operation Logs
Up to 40 operation logs recording. Parameters include trip settings, communication settings, output contacts settings, normalize events, relay trips, test trips, reset trips, record clearings and reset hour runs.

Hour Run
Shows the relays’ total time of operation (in hours). Used for scheduled servicing and maintenance.

Expansion
Expandable with programmable output contacts and RS485 to integrate with a building monitoring system.

OLED & IP Rating
Event records include the types and magnitude of the fault, date and time stamping. It reduces the time spent on fault tracing.
Protection Degree
Protection against foreign objects and water with IP31 (front) and IP20 (rear). IP65 optional.
Tested According to IEC Standard
Product safety, EMC compatibility, environmental, vibration, shock and bump tests.
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EMC
Compatibility
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Environmental
Test
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Product
Safety
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Vibration, Shock, Bump
Test

Technical Data
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Power Supply
AC/DC 85-265V (other voltage available)
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MTB Fault Indication System
ANSI 86 Lockout Relay
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Product Safety Requirements
IEC 60255-27
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Earth Fault Setting
2.0 – 50.0% (0.1% per step)
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Self Check
Self-diagnostic and auto-restore
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Electromagnetic Compatibility
IEC 60255-26
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Time Multiplier
0.02 – 2.00 in step of 0.01 (IEC, 1.3/10)
0.3 – 20.00 in step of 0.1 (ANSI, IAC) -
Event Records with data/time stamping
20 tripping events, 40 operation logs
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Cyclic Temperature with Humidity
EC 60255-1
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Definite Time Delay (DTL)
0.03 – 2.00 sec in step of 0.01 sec
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Output Contacts
1x CO (Changeover)
1x NO (Normally Open) -
Vibration, Shock, Bump
IEC 60255-21-1
IEC 60255-21-2 -
Instantaneous Mode (High Set)
2.0 – 10.0 times setting current in step of 0.1
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Protection Class
IP 31 (front), IP20 (rear)
IP 65 (front), optional) -
Safety
CE Marking
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Product Enquiry
Thank you for your interest in our products. Please do not hesitate to contact us for
a consultation to meet your individual needs. We look forward to hearing from you.