Selec 900VPR-2-300/600V 3-Phase Voltage & Frequency Protection Relay
Selec 900VPR-2-300/600V 3-Phase Voltage & Frequency Protection Relay
Industrial 3-phase voltage/frequency monitoring relay with under/over voltage, frequency, phase failure, asymmetry detection, dual relays, and programmable delays.
The Selec 900VPR-2-300/600V is an advanced 3-phase voltage and frequency protection relay designed for industrial and commercial installations. It continuously monitors voltage, frequency, asymmetry, phase sequence, and phase failure, ensuring equipment safety under unstable power conditions. The device features dual SPDT relays, programmable delays, and RMS measurement for high accuracy.
Key Features
Under/over voltage protection for 300V (L-N) and 600V (L-L) ranges
Under/over frequency monitoring (45–65 Hz)
Phase asymmetry detection (5–99.9%)
Phase sequence & phase failure protection
RMS measurement for 3-phase systems
Dual SPDT relays (each NO/NC)
Adjustable hysteresis for voltage, frequency & asymmetry
Trip delay, recovery delay & power-on delay configuration
DIN-rail mount (35mm)
Self-powered design
LED indication for power, relay 1, and relay 2
Lightning surge protection (600W on RS-232 side, 1000W on 422/485 lines)
Supports 3P3W & 3P4W systems
Technical Specifications (Table)
| Parameter | Details |
|---|---|
| Display | 3-digit LCD |
| Operating Range | 280–600V AC (L-L), 160–300V AC (L-N) |
| Frequency Range | 45–65 Hz |
| Voltage Accuracy | ±1% of set value |
| Frequency Accuracy | ±0.3 Hz |
| Phase Asymmetry | 5%–99.9% |
| Relay Outputs | 2 × SPDT Relay (NO/NC) |
| Relay Rating | NO 5A, NC 3A @ 250VAC |
| Power-On Delay | 2.0–99.9 sec |
| Trip Delay | 0–99.9 sec |
| Recovery Delay | 0–99.9 sec |
| Hysteresis Voltage | 1–99.9 V |
| Hysteresis Frequency | 0.2–2 Hz |
| Hysteresis Asymmetry | 2–20% |
| Environmental Conditions | 0–55°C operating; up to 95% RH non-condensing |
| Mounting | DIN rail, 35mm |
| Dimensions | 90×35×70.5 mm |
| Weight | 135 g |
| Protection | Indoor use, Pollution degree II |
(All specs referenced from manual pages 1–4)
Applications
Industrial electrical panels
Motor protection circuits
Pump control panels
HVAC systems
Manufacturing machinery
Generator & DG synchronization panels
Building management systems
Critical load protection
What’s in the Box?
Selec 900VPR-2-300/600V Relay
Instruction manual
Warranty card
FAQ
Q1: Does the relay require external power?
No, it is self-powered through the monitored voltage lines.
Q2: Can it work on both 3-wire and 4-wire systems?
Yes, it supports 3P3W and 3P4W networks.
Q3: How many outputs does the device provide?
Two independent SPDT relays, each programmable.
Q4: Does it detect incorrect phase sequence?
Yes, phase sequence monitoring is built-in.
Q5: What is the trip response time?
<200 ms response time.
Q6: What mounting method is used?
Standard 35mm DIN-rail mounting.