31DRPT24 - Lovato - Electronic protection relay

<h3>Thermistor protection relay for motor monitoring</h3><p>This thermistor protection relay is used in motor control panels where temperature information from thermistor sensors must be included in the protection chain. It is intended to supervise the thermal condition of the motor through the sensor circuit and to interact with the command logic when the temperature condition requires intervention.</p><h4>Sensor circuit and command logic</h4><p>supply voltage 24 VAC. The relay must be connected to the thermistor sensor circuit according to the panel wiring diagram. Its role is to add temperature-based motor protection to the control system, so it should be associated with the correct motor feeder, contactor command and signalling path. The supply voltage must match the available auxiliary circuit.</p><h4>Service check</h4><p>During replacement, compare supply voltage, sensor wiring, relay position and signalling contacts with the existing panel layout. After installation, check that the sensor circuit is correctly associated with the motor and that the control logic reacts according to the intended protection sequence.</p><p>Clear association between thermistor relay, motor and command circuit makes troubleshooting easier. It also reduces confusion in panels where overload relays, contactors and temperature protection devices are installed close together.</p><p>For commissioning and service, keep the sensor terminals, auxiliary supply and output contacts clearly identified in the panel documentation. If the relay is replaced, the new unit should preserve the same role in the motor protection chain and the same relationship with the contactor command circuit.</p><p>This layout keeps temperature protection separate from overload adjustment and makes the purpose of each relay easier to read during troubleshooting.</p> <h3>Thermistor protection relay for motor monitoring</h3><p>This thermistor protection relay is used in motor control panels where temperature information from thermistor sensors must be included in the protection chain. It is intended to supervise the thermal condition of the motor through the sensor circuit and to interact with the command logic when the temperature condition requires intervention.</p><h4>Sensor circuit and command logic</h4><p>supply voltage 24 VAC. The relay must be connected to the thermistor sensor circuit according to the panel wiring diagram. Its role is to add temperature-based motor protection to the control system, so it should be associated with the correct motor feeder, contactor command and signalling path. The supply voltage must match the available auxiliary circuit.</p><h4>Service check</h4><p>During replacement, compare supply voltage, sensor wiring, relay position and signalling contacts with the existing panel layout. After installation, check that the sensor circuit is correctly associated with the motor and that the control logic reacts according to the intended protection sequence.</p><p>Clear association between thermistor relay, motor and command circuit makes troubleshooting easier. It also reduces confusion in panels where overload relays, contactors and temperature protection devices are installed close together.</p><p>For commissioning and service, keep the sensor terminals, auxiliary supply and output contacts clearly identified in the panel documentation. If the relay is replaced, the new unit should preserve the same role in the motor protection chain and the same relationship with the contactor command circuit.</p><p>This layout keeps temperature protection separate from overload adjustment and makes the purpose of each relay easier to read during troubleshooting.</p>