Eaton/Moeller EMR4
Monitoring Relay Overview

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

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

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

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

• 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

EMR4-F... phase sequence 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

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

Supply
voltage

Monitoring
voltage
adjustable
from

• 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)

EMR4-W580-2-D

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