Eaton EMR-3MP0-2A9BB1 Motor Relay - Modbus RTU over RS485

Part Number: EMR-3MP0-2A9BB1
EMR-3MP0-2A9BB1
Manufacturer
Eaton
Part number
EMR-3MP0-2A9BB1
Category

Quick Summary

Eaton motor relay EMR-3MP0-2A9BB1 delivers integrated protection and control for industrial motor circuits. Engineers often wrestle with protection coordination, wiring complexity, and integration with existing control architectures. Compliance and reliability requirements—such as CE marking, SIL assessment where applicable, and IP sealing for harsh environments—make verification essential with any protective relay. This device supports RS-485 Modbus RTU, IRIG-B interfaces, and a projection-mount design, while offering current protection and metering. The result is a robust, scalable solution that enhances uptime, simplifies diagnostics, and aligns with automation strategies across manufacturing, oil and gas, and process industries.

Product Information

Extended Description

EMR-3MP0-2A9BB1 Eaton: Eaton, motor relay, EMR-3MP0-2, current only motor relay, 4I, 4O, 1AO ,IRIG-B, 5A PH and GND, Modbus RTU or DNP3 RTU over RS485, Conf. coat, 19-300Vdc, 40-250V, Projection mount
Product Name
Eaton motor relay
Catalog Number
EMR-3MP0-2A9BB1
UPC
786689222598
Product Length/Depth
8.06 in
Product Height
8.62 in
Product Width
6.82 in
Product Weight
5.82 lb
Compliances
Contact Manufacturer
Application
Motor
Type
Motor relay
Analog inputs
0
Phase current
5A
Analog outputs
1
Digital inputs
4
Digital outputs
4
I/O options
IRIG-B URTD Interface
Modbus / DNP3 RTU
over RS-485
Sensing inputs
Current Protection and Metering
Zone selective interlocking
0
Frequency rating
50/60 Hz
Mounting method
Projection
EMR-3MP0 V3.5.c 43511 device model and instruction books EMR-3MP0 V3.5.c 43511 device model and instruction books EMR-3MP0 control screen template EMR-3MP0 control screen template EMR-3MP0 technical data EMR-3MP0 motor protection relay instruction book Interfacing with an Eaton E-Series Relay, Step 6: Front Panel Navigation Interfacing with an Eaton E-Series Relay, Step 6: Front Panel Navigation Interfacing with an Eaton E-Series Relay, Step 6: Front Panel Navigation Interfacing with an Eaton E-Series Relay, Step 6: Front Panel Navigation Interfacing with an Eaton E-Series Relay, Step 6: Front Panel Navigation Interfacing with an Eaton E-Series Relay, Step 6: Front Panel Navigation Eaton Specification Sheet - EMR-3MP0-2A9BB1
Feature: The EMR-3MP0-2A9BB1 provides four digital inputs, four digital outputs, and a single analog output while excluding analog inputs. Business impact: This I/O configuration simplifies field wiring and enables compact protection logic inside the relay, reducing panel complexity and wiring errors. Application: Ideal for motor protection schemes on conveyors, pumps, and fans where precise I/O sequencing is essential.\n\nFeature: It communicates via Modbus RTU or DNP3 RTU over RS-485 and supports IRIG-B URTD interfaces. Business impact: This enables seamless integration with existing SCADA/DCS networks and precise time-stamping for coordinated control, improving diagnostics and data integrity. Application: Suitable for distributed control in process lines and remote motor controls.\n\nFeature: Sensing inputs include current protection and metering capabilities. Business impact: Real-time current monitoring enables adaptive protection settings, reduces nuisance trips, and supports energy management. Application: Critical in high-load applications like pumps and compressors where current-based protection is required.\n\nFeature: Electrical and mounting specs include a 50/60 Hz frequency rating and projection mounting. Business impact: Compatibility with standard industrial voltages and secure, space-efficient mounting simplifies retrofits and enclosure design. Application: Use in OEM panels and retrofit projects where mounting orientation matters.\n\nFeature: Physical dimensions (8.06 in L, 8.62 in H, 6.82 in W) and weight around 5.82 lb. Business impact: Predictable footprint improves cabinet layout planning and serviceability. Application: Environments with limited space require compact but capable protection relays.\n\nFeature: Compliance note shows 'Compliances: Contact Manufacturer' with emphasis on verification. Business impact: Encourages procurement to confirm certifications and match regulatory requirements; Eaton datasheets provide up-to-date qualification. Application: Critical for regulated industries like oil & gas, chemical, and energy.

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FAQs

Begin by verifying RS-485 wiring integrity and confirming the correct Modbus addresses for the EMR-3MP0-2A9BB1. Connect the RS-485 A/B lines to your RTU master, configure the device address, and set communication parameters (baud rate, parity) to match your network. Use the IRIG-B interface if precise time stamping is required for synchronization. Ensure proper grounding and enclosure protection to sustain reliable long-term operation.
Key specifications include a 50/60 Hz frequency rating, current protection and metering sensing, phase current up to 5 A, and four digital inputs with four digital outputs plus one analog output. Power can be supplied within the device’s DC ranges (noted in the data sheet), and the unit uses a projection mounting method suitable for compact control panels. Verify the exact supply voltage range in the Eaton datasheet before integration.
Yes. The device is designed as a motor relay with motor protection and metering, supporting multitier protection logic, current-based sensing, and RS-485 connectivity for remote monitoring. Its 4I/4O and 1AO configurations help coordinate protective actions across multiple motors in line applications, while projection mounting supports compact panel layouts in conveyor and pump houses.
Compliances are listed as manufacturer-dependent. For regulated environments, verify CE marking, SIL suitability, and IP ratings with Eaton’s documentation and the supplier’s certification sheets. Always confirm current qualification status with Eaton prior to purchase and integration to ensure alignment with your plant’s safety and environmental requirements.
The EMR-3MP0-2A9BB1 consolidates protection, metering, and communication in a single device, reducing wiring, panel space, and installation time. By delivering accurate current protection and reliable remote monitoring via RS-485, users typically see fewer trips, improved diagnostic speed, and lower downtime—contributing to a faster return on investment in mid to high-volume motor applications.