Under/Over Voltage Monitoring Relay, LCD, 3 phase 3-wire/4-wire

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$79.86

Under/Over Voltage Monitoring Relay, equipped with an LCD display and is suitable for 3-phase 3-wire or 4-wire power systems. This voltage monitoring relay is exquisitely designed and powerful, aiming to provide reliable voltage monitoring and protection, ensuring the stable operation of the power system.

Monitoring Voltage *

SKU: ATO-MR-GRV8S

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Delivery date: 6-12 days

Overview

The Under/Over Voltage Monitoring Relay, featuring an LCD display and tailor-made for 3-phase 3-wire or 4-wire power systems, offers efficient and reliable performance across a voltage range of 150V to 600V for 3-wire configurations and 80V to 350V for 4-wire setups, making it an ideal choice for monitoring and protecting your power systems. Feel free to contact us for more details or to place an order.

This voltage monitoring relay finds applications in various scenarios including controlling the connection of moving equipment such as site equipment, agricultural machinery, and refrigerated trucks. It also serves to protect personnel and equipment from the consequences of reverse running and facilitates switching between normal and emergency power supplies. Additionally, the monitoring relay provides protection against phase failure to ensure stable and safe system operation.

Feature

Controls its own supply voltage (True RMS measurement).
LCD display.
Measuring frequency range: 45Hz-65Hz.
Voltage measurement accuracy<1%.
2-MODULE, DIN rail mounting.
Ultra-small volume, only 36mm wide, with 35mm rail installation.

Specification

Model	ATO-GRV8-SN	ATO-GRV8-SP
Function	Monitoring L-N voltage (3-phase 4-wire system)	Monitoring L-L voltage (3-phase 3-wire system)
Monitoring terminals	L1-L2-L3-N	L1-L2-L3
Supply voltage limits	70V-400V	130V-650V
Rated supply frequency	45Hz-65Hz
Voltage hysteresis	2% Un
Measuring range	80V-350V	150V-600V
Measurement error	≤1%
Phase failure	50% Un
Start-reset delay time	0.3-30s
Temperature coefficient	0.05%/℃, at=20°C (0.05%°F, at=68°F)
Output	2×SPDT
Current rating	8A/AC1
Switching voltage	250VAC/24VDC
Min.breaking capacity DC	500mW
Mechanical life	1×10⁷
Electrical life (AC1)	1×10⁵
Operating temperature	-20℃ to +55C (-4°F to 131°F)
Storage temperature	-35℃ to +75℃ (-22°F to 158°F)
Mounting/DIN rail	Din rail EN/IEC 60715
Protection degree	IP40 for front panel/IP20 terminals
Operating position	any
Operating altitude	≤2000m
Overvoltage cathegory	Ⅲ.
Pollution degree	2
Max.cable size (mm²)	solid wire max.1×2.5 or 2×1.5/with sleeve max.1×2.5 (AWG12)
Dimensions	90×36×64mm
Weight	90g
Standards	EN 60255-1, IEC 60947-5-1

Wiring Diagram

Functions Diagram

Phase failure and phase equence function diagram

Phase failure function diagram

Overvoltage and undervoltage function diagram

Overvoltage and unovervoltage function diagram

Asymmetry function diagram

Asymmetry function diagram

To: Overvoltage threshold tripping delay.
Tu: Undervoltage threshold tripping delay.
Ta: Asymmetry threshold tripping delay.
Tr: Power up delay.

Dimensions (mm)

Tips: Enhancing Power System Stability with Under/Over Voltage Monitoring Relay

With increasing power demands and the rising complexity of power systems, maintaining a stable voltage supply becomes crucial. In such scenarios, the application of Under/Over Voltage Monitoring Relays becomes particularly significant. Equipped with LCD displays, these monitoring relays can continuously monitor voltage fluctuations, promptly detecting and responding to voltage anomalies. Especially in 3 phase 3-wire or 4-wire systems, these relays play a pivotal role, providing users with precise voltage monitoring and protection. By delving into the applications of these technologies, we can better understand how to utilize these advanced tools to enhance power system stability, ensuring the reliability and continuity of power supply.

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