ABB 1SVR430720R0300 Thermistor Relay

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1. Product Overview

The ABB 1SVR430720R0300 Thermistor Relay is a protective device used for temperature monitoring of motors and transformers. It works by connecting to PTC thermistors that detect temperature changes. When the motor or transformer exceeds a preset temperature, the relay triggers an alarm or cuts off the control signal, preventing overheating damage. This relay is widely used in low-voltage motor control cabinets, transformer protection systems, and industrial automation equipment.

2. Technical Specifications

• Model: 1SVR430720R0300

• Product Type: Thermistor Relay

• Control Input: PTC Thermistor

• Contact Type: 1 Normally Closed (NC) + 1 Normally Open (NO)

• Rated Voltage: AC 250 V / DC 30 V

• Rated Current: 6 A (AC-15) / 2 A (DC-13)

• Mounting: DIN rail or panel mount

• Mechanical Life: ≥ 1,000,000 operations

• Response Time: Immediate on temperature rise

• Degree of Protection: IP20

• Operating Temperature: –20 ℃ to +60 ℃

• Standards: IEC 60947-5-1 / CE

3. Advantages and Features

1. Reliable Temperature Protection
   Accurately senses PTC thermistor signals to prevent motor and transformer overheating.

2. Flexible Contact Configuration
   1 NC + 1 NO contacts allow for alarm or control circuit interruption.

3. Easy Installation
   Supports DIN rail or panel mounting for versatile cabinet layouts.

4. Long Lifespan
   High mechanical endurance, suitable for frequent operation in industrial environments.

5. Industrial Compatibility
   Stable operation under high temperature, vibration, and harsh industrial conditions.

4. Applications

• Low-voltage motor thermal protection

• Transformer temperature monitoring

• Motor control cabinets and protection systems

• Industrial automation equipment

• Motors in fans, pumps, compressors, etc.

5. Installation and Usage Notes

1. Ensure compatibility with the selected PTC thermistor before installation.

2. Perform wiring with power disconnected to prevent electric shock.

3. Correctly wire NC/NO contacts to ensure proper alarm or control logic.

4. Avoid direct use in high humidity, dusty, or corrosive environments; use protective covers if necessary.

5. Regularly inspect contacts and relay status to ensure reliable protection.