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Eaton/Moeller EMR4
Monitoring Relay Overview
Part Name
Image		 Description Supply
voltage		 Response
sensitivity

EMR4-N Moeller Measuring Relay

EMR4-N100-1-B
  • Monitors the level of conductive liquids
  • Monitors the ratio of mixtures of conductive liquids
  • Selectable: protection against running dry  or overflowing
 220 – 240
V AC		 5 Ώ –
100 kΏ
EMR4-N500 Moeller Measuring Relay

EMR4-N500-2-B
  • Monitors the level of conductive liquids
  • Monitors the ratio of mixtures of conductive liquids
  • Selectable On-delay or Off-delay between 0.5 – 10 s

250 Ώ –
500 kΏ

EMR4-N500-2-A
  •  Monitors the level of conductive liquids
  • Monitors the ratio of mixtures of
    conductive liquids
  • Selectable On-delay or Off-delay between
    0.5 – 10 s

24 – 240 V
AC/DC

EMR4-R... insulation monitoring relays
Part Name
Image		 Description Supply
voltage		 Insulation
resistance
range
Ώ

EMR4-R Moeller Measuring Relay

EMR4-RDC-1-A
  • Monitors the insulation resistance in nonearthed DC supply systems
  • Selector switch for open- or closed-circuit principle
  • With test and reset facilities
  • Status indication via LEDs
 24 – 240 V
AC/DC		 10 – 110 kΏ

EMR4-RAC-1-A
  • Monitors the insulation resistance between non-earthed AC supply systems and the protective conductor/earth
  • Tripping function memory
  • Insulation monitoring in 1- and 3-phase AC supply systems
  • Test via local test button or remote test operation
  • Status indication via LEDs to VDE 0413 / Part 2

EMR4-I... current monitor relays
Part Name
Image		 Description Supply
voltage		 Current
measuring
range

EMR4-I Moeller Measuring Relay

 EMR4-I1-2-A
  • Switching hysteresis adjustable from 5 – 30 %
  • Response delay 0.1 – 30 s
  • EMR4...-A: monitors one upper or lower limit
  • EMR4...-B: monitors one upper limit
  • Extension of the measurement range possible with current transformers
 24 – 240
V AC/DC		 3 – 30 mA
10 – 100 mA
0.1 – 1 A
EMR4-I15-2-A 0.3 – 1.5 A
1 – 5 A
3 – 15 A
EMR4-I15-2-B 220 – 240
V AC		 0.3 – 1.5 A
1 – 5 A
3 – 15 A

EMR4-F... phase sequence relay
Part Name
Image		 Description Supply
voltage		 Monitoring
voltage

EMR4-F Moeller Measuring Relay

EMR4-F500-2
  • Monitors three-phase systems for phase sequence and phase failure
  • Supply voltage = voltage being monitored

200 – 500
V AC

EMR4-A... phase imbalance monitoring relay
Part Name
Image		 Description Supply
voltage		 Monitoring
voltage

EMR4-A Moeller Measuring Relay

EMR4-A400-1
  • Monitors three-phase systems for phase imbalance
  • Detects phase failure even at 95% voltage feedback from the motor
  • Response delay: 0.5 s
  • Phase imbalance response threshold adjustable from 5 – 15 %
  • Phase sequence detection
  • Supply voltage = voltage being monitored

380 – 415 V
50 Hz

EMR4-W phase monitoring relay
Part Name
Image		 Description

Supply
voltage

Monitoring
voltage
adjustable
from
EMR4-W Moeller Measuring Relay EMR4-W500-2-C
  • Monitors three-phase systems for phase sequence, over- and undervoltage and phase failure (< 0.6 x Ue)
  • 3-phase voltage monitoring within a range
  • Selectable On-delay or Off-delay (0.1 – 10 s)
 160 – 330
V AC		 Umin 300 –
380 V AC
Umax 420 –
500 V AC
EMR4-W500-2-D 300 – 500
V AC

EMR4-W580-2-D

 300 – 500
V AC

Umin 350 –
430 V AC
Umax 500 –
580 V AC
 

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