ABB 1SVR730824R9300 Phase Monitoring Relay

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• 1. Product Model & Basic Introduction

  This product model is ABB 1SVR730824R9300 (series CM-PFS.S phase sequence / phase monitoring relay). It is a three-phase network monitoring relay designed to monitor phase sequence correctness, phase loss (phase failure) and voltage range compliance in three-phase power systems, thereby protecting motors or three-phase equipment from damage due to incorrect phase connection or missing phases.

  2. Technical Specifications

  • Model: 1SVR730824R9300, series CM-PFS.S.

  • Voltage monitoring range: 200 V to 500 V AC (for three-phase system).

  • Power supply: self-powered (drawn from the three-phase supply itself; no separate auxiliary supply required).

  • Output contacts: 2 × changeover contacts (DPDT – Double Pole Double Throw).

  • Contact rated current: 4 A.

  • Mounting: DIN-rail installation; screw terminals.

  • Dimensions: Width 22.5 mm, Height ~85.6 mm, Depth ~103.7 mm.

  • Monitoring functions: Phase sequence detection, phase loss detection.

  • Response delay: Typical delay about 0.5 second.

  • Approvals / Standards: Compliant with IEC, UL, CSA standards.

  3. Advantages and Features

  • Comprehensive three-phase protection: Monitors phase sequence and phase loss, effectively safeguarding three-phase motors or equipment from damage due to incorrect phase wiring or missing phases.

  • Wide voltage applicability: Monitoring range covers 200-500 V AC, making it suitable for a variety of three-phase system environments.

  • Self-powered design: No need for an external auxiliary supply simplifies wiring and installation.

  • Compact size, DIN-rail mountable: With only 22.5 mm width, it is space-efficient for installation in distribution or control panels.

  • Fast response: With typical response delay of approximately 0.5 s, it can promptly disconnect abnormal condition, enhancing equipment protection.

  • Reliable contact capacity: Equipped with DPDT contacts rated at 4 A, suitable for direct control of relays or small loads.

  • Installation-friendly & quick commissioning: Easy to install, wire and set up, well suited for the typical three-phase monitoring demands in industrial automation or electromechanical control systems.

  4. Typical Application Areas

  • Three-phase motor drive systems (such as pumps, fans, compressors) — to prevent motor reverse operation or damage caused by phase sequence reversal or phase loss.

  • Three-phase power monitoring in distribution boxes and control cabinets, as auxiliary protection for equipment.

  • In industrial automation machinery and production lines for monitoring three-phase power input.

  • In HVAC (heating, ventilation, air-conditioning) systems for three-phase power monitoring and protection.

  • In machine tools, machining centers, robot systems for three-phase power status monitoring.

  • In water treatment plants, pump stations, commercial building M&E systems for reliable three-phase power monitoring.

  5. Usage Notes & Precautions

   

  • Prior to installation, confirm that the system is three-phase and the supply voltage is within the product’s monitoring range (200-500 V AC).

  • During wiring, ensure that the three-phase supply is connected correctly according to the terminal markings; do not connect phases incorrectly or miss any phase.

  • Although this relay is self-powered, ensure safe and correct wiring, proper terminal tightening and appropriate conductor sizing during installation.

  • Choose an installation position with moderate temperature, minimal vibration, and free from heavy dust or corrosive gases to avoid adverse effect on relay life and reliability.

  • Periodically inspect the relay contacts and wiring connections; if signs of damage (burn marks, looseness, damaged contacts) appear, replace the device promptly.

  • When the system fault or abnormal condition (e.g., phase loss or phase sequence error) triggers the relay, analyze the root cause and correct it before resuming normal operation.

  • Although this device offers phase-monitoring protection, for more comprehensive equipment protection it is recommended to use it in combination with over-current, overload, short-circuit protection devices.