Description
Key Technical Specifications
| Parameter | Typical Value / Note |
|---|---|
| Product type | Motor protection relay (current-only) |
| Model | MP3010 |
| Base relay | MP-3000 |
| Power supply | 120 VAC |
| Phase current input | 5 A nominal |
| Current sensing inputs | 1 (phase CT input) |
| Discrete inputs | 2 programmable |
| Output contacts | 4 Form-C, programmable |
| Analog output | 1 × 4–20 mA, programmable |
| Communication | RS-232 |
| Motor overload range | FLA 10–3000 A (via CT ratio) |
| Ground fault range | Off, 2%–55% of CT ratio primary |
| Instantaneous overcurrent | Off, 300%–1600% FLA |
| Mounting | Panel / relay case mount |
| Condition | Discontinued; surplus/refurbished supply typical |
Product Introduction
The Eaton MP3010 is a member of the MP-3000 motor protection relay family, designed as a current-only protective relay for AC motor applications. It uses external current transformers to monitor phase and ground current, then applies microprocessor-based algorithms for overload (I²t), ground fault, instantaneous overcurrent, jam, underload, and phase unbalance protection. With 4 programmable Form-C outputs, 2 discrete inputs, 1 analog output, and RS-232 communication, it can integrate into older motor control centers and SCADA interfaces without requiring voltage sensing hardware.
Procurement clarity matters here. Third-party listings sometimes describe “MP3010” as a touchscreen HMI or a generic safety relay, but those references do not match the Eaton MP-3000 MP3010 motor protection relay documented by authorized distributors. For replacement or retrofit, confirm the 120VAC supply requirement, 5A CT input, RS-232 interface, and output configuration against the existing panel design. Because this is a discontinued unit, firmware version, output contact condition, and analog output calibration should be verified before site installation.
QA/QC Transparency SOP
- Intake & Origin Verification — Confirm Eaton/Cutler-Hammer branding, MP3010 model marking, MP-3000 family identification, serial number, and hardware revision. Reject units with damaged terminal blocks, burnt components, or missing nameplates.
- Visual & Mechanical Inspection — Check terminal screws, RS-232 port, LED indicators, and mounting hardware. Verify the case matches the MP-3000 fixed-case relay form factor.
- Power-Up Test — Apply 120VAC to the rated supply terminals. Verify boot sequence, LED status, and absence of persistent fault codes.
- Input/Output Verification — Inject test current into the phase CT input and verify pickup/dropout behavior. Test all 4 Form-C outputs, 2 discrete inputs, and the 4–20 mA analog output against specification.
- Communication Test — Connect via RS-232 and verify parameter read/write, event log access, and firmware identification.
- Final QC & Packaging — Document serial number, firmware revision, test results, and physical condition. Pack in anti-static material with moisture protection.
Field Engineer Gotchas
- Identity confusion — “MP3010” appears in unrelated listings as an HMI or safety relay. Confirm it is the Eaton MP-3000 motor protection relay before ordering.
- Current-only device — does not measure bus voltage directly. Voltage-dependent functions such as undervoltage or phase-sequence protection are not available without external logic.
- CT ratio must match settings — Incorrect phase or ground CT ratios will cause false trips or failure to trip. Always verify CT nameplate data against relay settings.
- RS-232 is legacy — RS-232 requires a serial adapter for modern laptops. Confirm baud rate, protocol, and software compatibility before commissioning.
- Output contact wear — Discontinued relays may have aged output contacts. Verify contact resistance and switching capability under load before relying on trip outputs.
- Firmware and setting backup — Always back up existing settings before replacing a relay. Parameter sets are not always portable between revisions.
EATON MP3010
Application Scenarios
- MCC retrofit — Replacing a failed MP-3000 relay in an existing motor control center where 5A CTs and 120VAC control power are already installed.
- Legacy pump/fan protection — Maintaining motor protection on critical pumps, fans, or compressors where the original MP-3010 is no longer available new.
- Brownfield SCADA integration — Using the RS-232 interface to read motor current, status, and fault records from an older monitoring system.
- Spare pool standardization — Keeping a tested surplus as a like-for-like spare for plants running MP-3000 relays.
FAQ
No. The Eaton referenced here is an MP-3000 motor protection relay. Some unrelated listings use the same number for HMI products, but those are not the Eaton MP-3000 relay.
No. It is a current-only relay. It relies on CT inputs for phase and ground current; it does not directly measure line voltage.
What communication does it support?
RS-232. It does not natively include Ethernet, Modbus TCP, or Profibus in the configuration.
Can it replace other MP-3000 variants directly?
Not automatically. Other MP-3000 variants may have different supply voltages, current inputs, communication options, or output configurations. Verify the exact catalog number and settings before substitution.
What CTs are required?
5A secondary CTs matching the motor FLA and relay CT ratio settings. The relay supports phase CT ratios from 10:1 to 4000:1.
Is it still available new?
No. is discontinued. Supply is mainly surplus, refurbished, or removed-from-service stock.
What should I check before purchasing?
Confirm model , 120VAC supply, 5A current input, RS-232 interface, output contact condition, firmware revision, and compatibility with the existing CTs and control wiring.
