Selec MPR-3M Analog Motor Protection Relay for 1Ø & 3Ø Motors
Selec MPR-3M Motor Protection Relay – 3Ø, Overload, Phase Failure, Phase Sequence
DIN-rail motor protection relay for 3-phase systems with selectable trip curves, overload protection, phase failure/sequence monitoring, undercurrent detection, and DPDT relay output.
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The Selec MPR-3M Motor Protection Relay is a compact DIN-rail mounted 3-phase protection device designed for industrial motors. It provides overload, phase failure, phase asymmetry, phase sequence, and undercurrent protection with user-selectable trip curves and adjustable CT ratings. Suitable for a wide range of motors and automation panels.
Key Features
3Ø – 3-wire monitoring with overload, phase sequence, phase asymmetry, phase failure & undercurrent detection.
Selectable trip time curve (IDMTL) and motor current rating.
DPDT relay output rated at 5A at 240V AC.
LED indications: Power ON, Trip, SP & OL status.
Front/remote test & reset functionality.
DIN rail mounting for easy panel integration.
CT selectable ranges: 10A, 40A, 80A.
Auto, manual, and remote reset modes.
Wide supply voltage options: 230V AC / 415V AC models.
Compact size: DIN 52.5 mm.
Technical Specifications
| Specification | Details |
|---|---|
| Input System | 3Ø, 3-wire monitoring |
| Functions | Overload, Phase Sequence, Phase Failure, Phase Asymmetry, Undercurrent |
| Reset Modes | Auto / Manual / Remote |
| Trip Accuracy | ±5% of setting |
| CT Ranges | 10A, 40A, 80A |
| Trip Delays | OL: IDMT curve; UC: 5 sec; Power-on < 500 ms |
| Relay Output | DPDT, 5A at 240V AC |
| LED Indications | Power ON, SP, OL |
| Aux Supply | 230V AC ±15% / 415V AC ±15% |
| Frequency | 45–65 Hz |
| Power Consumption | 3 VA max |
| Operating Temperature | 0°C to 50°C |
| Humidity | Up to 95% RH (non-condensing) |
| Mounting | DIN Rail |
| Weight | 180 g |
Applications
Industrial motors & pump control
HVAC blowers and compressors
Manufacturing automation panels
Motor control centers (MCC)
Conveyors, mixers, crushers
General 3-phase load protection
What’s in the Box?
1 × Selec MPR-3M Motor Protection Relay
User manual
Warranty card
FAQ
Q1. Is the MPR-3M suitable for all 3-phase motors?
Yes, it supports most 3-phase induction motors with CT settings of 10A, 40A, and 80A.
Q2. Does it require an external CT?
No. It has built-in CT selection. Just configure the CT range based on motor rating.
Q3. Can it detect the wrong phase sequence?
Yes, it trips for incorrect phase rotation and phase failure.
Q4. Can it be reset remotely?
Yes, via terminals 16 & 17 (as per the wiring diagram).
Q5. Does it support auto-reset?
Yes—the device auto-resets after 15 minutes of healthy condition.