The Selec PPRD-4M-3-415V Pump Protection Relay provides comprehensive protection for 3-phase motors and pumps. It monitors overload (NEMA curve), overcurrent, dry run/undercurrent, locked rotor current, phase sequence, phase failure, voltage asymmetry, and supply voltage variations. With a wide measuring range (3A–80A via external CT), digital LED display, and push-button start/stop, it is ideal for industrial pump control and agricultural pumping systems.

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Key Features

• 3Ø – 3-wire monitoring for pumps and motors

• Monitors Overload (NEMA class 5, 10, 15, 20, 30), Overcurrent, Dry Run/Under Current, Locked Current, Current Asymmetry

• Protects against Phase Sequence, Phase Failure, Over Voltage, under voltage, and voltage asymmetry.

• External CT support (MPCT) for 10A, 40A, 80A ranges

• LED indications for Trip and Pump ON

• Push-button Start/Stop + Front/Remote Reset

• Adjustable trip delay (0–999 s) and recovery delay (1–999 s)

• DIN-rail mounting, compact 70 mm housing

• SPDT relay output (5A NO / 3A NC)

• Wide supply range 280–500V AC (L–L)

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Technical Specifications 

Parameter	Details
Input System	3Ø, 3-wire
Current Measuring Range	3A–80A via MPCT (10A/40A/80A CT ranges)
Voltage Measuring Range	280–500V AC (L–L)
Overload Class	NEMA Class 5, 10, 15, 20, 30
Trip Delay	0–999 sec
Recovery Time	1–999 sec
Phase Loss & Reversal	Instantaneous (<240 ms)
Reset Attempts	3 attempts (fixed)
Voltage Hysteresis	0–10V
Accuracy	Current ±5%, Voltage ±1%
Output Relay	1 C/O (SPDT), NO 5A@250VAC / NC 3A@250VAC
Display	3-digit, 7-segment LED
Keys	Set/Up-Test/Down-Reset
Operating Voltage	280–500V AC
Power Consumption	40 VA
Dimensions	99.20 × 70 × 66.35 mm
Weight	220 g
Operating Temp	0°C to +55°C
Humidity	Up to 95% RH

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Applications

• Industrial & agricultural pumps

• Water treatment plants

• Lift irrigation and borewell systems

• HVAC pump motors

• Industrial control panels

• Pump starter panels (DOL/Star-Delta)

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What’s in the Box?

• 1 × Selec PPRD-4M-3-415V Pump Protection Relay

• Instruction manual

• Warranty information

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FAQ 

Q1. Does the PPRD-4M-3 protect against dry run?
Yes. Undercurrent protection is provided based on CT measurement.

Q2. Which CT should be used?
Selec MPCT D15 series: 10A / 40A / 80A based on motor current.

Q3. Is phase reversal protection available?
Yes. Phase reversal detection is instantaneous (<240 ms).

Q4. Can the unit be reset remotely?
Yes. Dedicated terminals for remote reset are provided.

Q5. Does it support push-button motor start/stop?
Yes. Start & Stop inputs are potential-free push-button compatible.

Q6. Can it monitor high-voltage pumps?
Yes, it supports 280–500V AC (L–L) measuring & supply voltage.