Description
Eaton MP-3010 | Replacement MP-3000 Relay
Product Introduction
Motor protection applications often come down to one requirement: replace the relay without changing the protection philosophy built around the motor starter. The Eaton MP-3010 is the fixed-case, 5 A CT version of the MP-3000 motor protection relay family, providing programmable protection, metering, alarm, control, and event-history functions for three-phase motors. Eaton specifies compatibility with motors across a 10–3,000 A full-load-current range, with configurable protection functions covering overload, ground fault, instantaneous overcurrent, jam, underload, and phase unbalance.
The MP-3010 is particularly relevant to maintenance groups supporting legacy Eaton motor-control installations where an exact relay replacement is preferable to redesigning the protection scheme. Its architecture includes two programmable discrete inputs, four programmable Form C output contacts, and one programmable ±4–20 mA analog output. Optional URTD hardware can extend the system with RTD-based motor and bearing temperature monitoring.
MP-3010
Key Technical Specifications
- Manufacturer: Eaton
- Model: MP-3010
- Series: MP-3000 Motor Protection
- Configuration: Fixed case
- Current input: 5 A nominal CT
- CT continuous rating: 2 × In
- Short-duration CT rating: Up to 50 × In for 1 second, per the later Eaton technical documentation.
- Control power: 120 VAC or 240 VAC nominal
- 120 VAC operating range: 90–132 VAC
- 240 VAC operating range: 180–264 VAC
- Control frequency: 50/60 Hz
- Programmable discrete inputs: 2
- Output contacts: 4 programmable Form C
- Continuous contact rating: 5 A at 120/240 VAC; 5 A at 30 VDC
- Analog output: ±4–20 mA programmable
- Analog output maximum load: 1 kΩ
- Analog output accuracy: 1%
- Motor full-load-current setting range: 10–3,000 A
- Locked-rotor current setting: 300–1,200% FLA
- Locked-rotor time: 1–120 seconds
- Ultimate overload trip: 85–150% FLA
- Ground-fault trip range: Off or 2–55% of CT ratio
- Instantaneous overcurrent: Off or 300–1,600% FLA
- Jam protection: Off or 100–1,200% FLA
- Underload protection: Off or 6–90% FLA
- Phase-unbalance protection: Off or 4–40%
- Starts-per-time function: 1–10 starts
- Cold-start limit: 1–5 starts
- Antibackspin timer: Off or 1–3,600 seconds
- RTD monitoring: Available through the optional URTD module
- RTD sensor support: 10 Ω copper, 100/120 Ω nickel, and 100 Ω platinum types.
Application Scenarios & Pain Points
Legacy motor-control replacement
For an existing MP-3000 installation, the MP-3010 provides a direct model-level reference for the fixed-case, 5 A CT configuration. This can be useful when the maintenance objective is to restore an existing protection architecture rather than introduce a different relay platform.
Three-phase motor overload protection
The relay provides I²t motor overload protection with configurable full-load current, locked-rotor current/time, and ultimate-trip parameters. This gives commissioning engineers control over the relationship between motor thermal capacity and the protection settings.
Motor starting and high-inertia loads
The MP-3000 platform includes starting controls for starts-per-time, cold starts, transition current, incomplete sequence, long acceleration, and antibackspin. These functions are relevant to applications where normal acceleration can otherwise be mistaken for a fault condition.
Condition monitoring and maintenance diagnostics
The relay records motor operating information, trip history, alarm history, starting information, and operating counters. With the optional URTD module, additional temperature information can be incorporated for motor windings, bearings, load bearings, and auxiliary measurements.
Control-system integration
The base MP-3010 includes programmable relay outputs and an analog output. Do not assume that every MP-3010 has a network interface, however. Eaton lists INCOM, Modbus, and DeviceNet as separate MP-3010 variants, so the exact catalog suffix must be verified before designing a communications replacement.
QA & Live Testing SOP
For procurement of an open-box or surplus Eaton MP-3010, use the following acceptance procedure before installation:
- Identity verification
- Confirm the front and side nameplates show MP-3010.
- Verify the fixed-case configuration.
- Record the style/catalog information and serial information before energization.
- Physical inspection
- Inspect terminal blocks, housing, display area, selector controls, and mounting points.
- Check for cracked insulation, corrosion, damaged connectors, or evidence of overheating.
- Pay particular attention to CT input terminals because incorrect current-transformer wiring can create an unsafe commissioning condition.
- Power-up verification
- Apply the correct control voltage specified for the particular unit.
- Verify normal initialization and display behavior.
- Confirm there are no unexpected fault indications.
- Current-input simulation
- Use an appropriate relay test source or controlled current-injection system.
- Verify phase-current measurement against the configured CT ratio.
- Check metering response against the applicable Eaton accuracy specification.
- Protection-function testing
- Verify representative overload, ground-fault, jam, underload, instantaneous-overcurrent, and phase-unbalance settings as applicable to the intended installation.
- Confirm trip and alarm outputs operate according to the configured logic.
- Output verification
- Check all four programmable Form C outputs.
- Verify the programmable analog output across its intended operating range.
- Confirm external control circuitry sees the expected relay state.
- Documentation
- Record tested settings, input values, trip thresholds, output behavior, and serial/reference information.
- Preserve the test record with the maintenance asset documentation.
- Packaging
- Use ESD-conscious handling for electronic components.
- Protect terminal areas, connectors, display surfaces, and the relay housing against impact and moisture during shipment.
The supplied listing identifies this particular unit as New – Open Box and notes that it includes CD documentation and hardware; those are listing-specific details and should still be checked against the physical shipment before acceptance.
Field Engineer’s Pitfall Guide
❗ Do not confuse MP-3010 with the communications variants.
Eaton lists MP3010, MP3010-INCOM, MP3010MODBUS, and MP3010DEVICEN as separate configurations. A replacement that matches the basic model family but lacks the required communications interface can create an integration problem.
❗ Verify the CT secondary rating before installation.
The standard MP-3010 is the 5 A CT configuration. Eaton also produced 1 A versions under the MP-3110 family. Do not substitute based only on the MP-3000 family name.
❗ Do not assume RTD capability means an RTD module is installed.
Eaton specifies RTD monitoring through the optional URTD module. The relay can contain the relevant configuration capability without the optional hardware being present.
❗ Check control voltage before energizing.
The MP-3000 documentation specifies 120 VAC or 240 VAC nominal control power, with different operating ranges. Confirm the actual unit and panel wiring before applying power.
❗ Do not use the MP-3000 as a VFD protection relay without checking the application.
Eaton documentation specifically states that the MP-3000 is not intended for use with variable-frequency motor drives.
Intent-Driven FAQ
Is the Eaton MP-3010 a motor protection relay?
Yes. The Eaton MP-3010 is a fixed-case MP-3000 motor protection relay using a 5 A nominal CT input. Its functions include motor overload, ground fault, instantaneous overcurrent, jam, underload, and phase-unbalance protection.
What is the difference between MP-3010 and MP3010MODBUS?
They are different catalog configurations. MP3010 is the fixed-case 5 A CT base configuration, while Eaton identifies MP3010MODBUS as the fixed-case 5 A CT version with Modbus communications. Verify the complete catalog designation when replacing a networked relay.
Does the MP-3010 support 4–20 mA?
Yes. Eaton specifies a programmable ±4–20 mA analog output with a maximum load of 1 kΩ and 1% accuracy. The exact output configuration should be checked against the relay settings and application documentation.
What motor size can the MP-3010 protect?
The MP-3000 protection system provides a full-load-current setting range of 10–3,000 A. Actual application suitability depends on the CT ratio, motor characteristics, protection settings, and installation design.
Can the MP-3010 monitor motor temperature?
Yes, when used with the optional URTD module. Eaton documents RTD inputs for motor stator windings, motor bearings, load bearings, and auxiliary temperature measurement.
Is this particular MP-3010 new or used?
The supplied listing identifies it as New – Open Box and states that it is new in box with CD documentation and hardware. Physical condition, completeness, and operational status should be verified during receiving inspection rather than inferred solely from the listing classification.
Is MP-3010 suitable as a replacement for an existing MP-3000?
It can be a relevant replacement reference when the existing installation calls for the fixed-case, 5 A CT MP-3000 configuration. Before purchase or installation, compare the complete catalog designation, CT rating, control voltage, communications option, accessories, wiring, and protection settings against the existing relay.
