Selec PPRD-4M-3-415V 3Ø Digital Pump Protection Relay
Selec PPRD-4M-3-415V Pump Protection Relay – 3Ø, Overload, Dry Run, Voltage & Phase Protection
Advanced digital pump protection relay with overload (NEMA curve), dry run, over/under voltage, phase sequence/failure, current asymmetry, and CT-based current monitoring for 3Ø pumps.
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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.
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)
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)
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
| 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 |
Applications
Industrial & agricultural pumps
Water treatment plants
Lift irrigation and borewell systems
HVAC pump motors
Industrial control panels
Pump starter panels (DOL/Star-Delta)
Industrial & agricultural pumps
Water treatment plants
Lift irrigation and borewell systems
HVAC pump motors
Industrial control panels
Pump starter panels (DOL/Star-Delta)
What’s in the Box?
1 × Selec PPRD-4M-3-415V Pump Protection Relay
Instruction manual
Warranty information
1 × Selec PPRD-4M-3-415V Pump Protection Relay
Instruction manual
Warranty information
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.