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Eaton’s Motor Relays (EMR3MP0, EMR3000, EMR4000 and EMR5000) provide unparalleled motor protection. These relays are most commonly applied to medium-voltage or larger motors. Users appreciate the multiple protection functions, which include zone-selective interlocking and programmable logic control. EMR’s integral test function reduces maintenance time and expense, while the self-diagnostics and reporting increase uptime and simplifies troubleshooting.
Eaton E-Series Protection Relay Devices purchased after May 31, 2023 will now have a warranty extension of 10 years, superseding the previous warranty of 18 months.
Eaton motor protection relays support all of the following communication protocols as well as the "Do Not Use" option.
The EMR-3000 is a current-only motor relay with flexible configuration options and multiple settings groups.
50BF— Breaker failure
50P— Phase instantaneous overcurrent elements
50R— Calculated ground or neutral instantaneous overcurrent elements
50X— Measured ground or neutral instantaneous overcurrent elements
51P— Phase overcurrent protection per time-current curve elements
51R— Calculated ground fault protection per time-current curve elements
51X— Measured ground or neutral fault protection per time-current curve elements
46— Current unbalance elements
49/38— Thermal protection using optional URTD module
49/51— Thermal overload protection (I2 T)
49S/51— Locked rotor
50J— Jam or stall protection
37— Underload protection
66— Starts per time period
14— Underspeed
CTS— Current transformer supervision
74TCM— Trip coil monitor (option)
ZI— Zone selective interlocking (option)
86— Lockout protection
The EMR-4000 has all of the same protection functions as the EMR-3000 with the following additional features.
27A/M— Auxiliary and main three-phase undervoltage elements
47— Voltage unbalance elements
55A/D— Apparent and displacement power factor elements
59A/M— Auxiliary and main three-phase overvoltage elements
59N— Ground fault overvoltage elements
32/32V— Forward and reverse watts and VARs elements
51V— Voltage restraint elements
78V— Vector surge element
81U/O/R— Under and over and rate of change frequency elements
LOP— Loss of potential
CLPU— Cold load pickup
SOTF— Switch on to fault
BRB— Broken rotor bar detection
The EMR-5000 has all of the same protection functions as the EMR-4000 with the following additional features.
87M— Differential current elements
Elements available on all EMR models
Elements available on EMR-4000 and EMR-5000
Elements available on EMR-5000
The EMR-3MP0 provides basic motor protection based on motor nameplate data. The EMR-3MP0 has been specially designed to simplify settings and configurations.
Standard relay and MP-3000 replacement kits
See the document, EMR-3MP0 installation instructions, located on the resources tab for more information.
Flexible configuration options and multiple settings groups
The EMR-3000 is a current-only motor relay with flexible configuration options and multiple settings groups.
The EMR-4000 has the same features as the EMR-3000 but adds voltage protection and metering.
The EMR-5000 builds on the EMR-4000 by adding motor differential protection and a larger display.
All E-series relays, including our E-series motor relays, use the same software interface for easy access to information and programming of settings. Whether you are using the front panel or the external software, the interface is the same on all models.
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Find detail information on troubleshooting common problems that occur with Eaton's E-series protective relays.
Support from Eaton
Technical Support Information
For support on any aspect of the product or installation process contact our Customer Integrity Team:
Pricing, Availability and expedites (Eaton Care)
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