ABB 1SVR740750R0400 Voltage Monitoring Relay

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Product Overview

The ABB 1SVR740750R0400 is a high-performance voltage monitoring relay designed to monitor voltage conditions in single-phase or three-phase power systems. It detects overvoltage, undervoltage, phase sequence, and phase loss, providing reliable control and protection signals for low-voltage distribution, industrial automation, and power system monitoring.

Main Technical Specifications

• Model: 1SVR740750R0400

• Product Type: Voltage Monitoring Relay

• Monitored Voltage: AC 3×400 V / 230 V, configurable for single-phase or three-phase

• Input Type: 3-wire or 4-wire three-phase system

• Monitoring Functions: Overvoltage, undervoltage, phase sequence, phase loss

• Relay Output: 2 SPDT contacts

• Response Time: ≤ 200 ms

• Reset Type: Manual / Automatic reset

• Operating Frequency: 50/60 Hz

• Operating Power Supply: AC 110–415 V

• Operating Temperature: -20 ℃ to +60 ℃

• Protection Class: IP20

• Mounting: DIN rail

• Standards: IEC/EN 60255, UL

Key Advantages & Features

1. Multi-function Voltage Monitoring
   Simultaneously monitors overvoltage, undervoltage, phase loss, and phase sequence to ensure stable system operation.

2. High Accuracy and Fast Response
   Response time ≤ 200 ms allows rapid reaction to voltage anomalies, improving equipment protection.

3. Clear Status Indication
   LED indicators show abnormal conditions for quick on-site identification.

4. Compact Modular Design
   DIN rail mounting saves space and simplifies panel layout.

5. Flexible Reset Options
   Manual or automatic reset selectable to suit different control requirements.

6. High Reliability
   Industrial-grade design suitable for long-term operation in harsh environments.

Typical Applications

• Industrial low-voltage distribution systems

• Power substations and distribution boards

• Machinery and automated production lines

• Motor control and protection

• Renewable energy systems (solar, wind)

• Building power management systems (BMS)

Installation & Operation Notes

• Ensure relay voltage rating matches the system voltage

• Avoid installation in high humidity, dusty, or corrosive environments

• Securely mount on DIN rail to prevent vibration-induced loosening

• Periodically inspect relay contacts and wiring connections

• Observe safety precautions when operating with live voltage