SIEMENS Sirius 3RN1012-1BM00 Thermistor motor protection (1PCS)

Siemens SIRIUS 3RN1012-1BM00 Thermistor Motor Protection Relay

• Type: Thermistor Motor Protection Relay

Siemens 3RN1012-1BM00 SIRIUS Thermistor Motor Protection 

The Siemens 3RN1012-1BM00 from the SIRIUS 3RN1 series is a standard evaluation unit for thermistor motor protection, designed to safeguard electric motors against thermal overload and overheating. It operates by monitoring the temperature of PTC thermistors embedded directly in the motor windings.

This reliable protection relay detects critical temperature conditions signalled by the PTC thermistors and also monitors for faults in the thermistor circuit, such as short circuits or open circuits. Upon detecting an unsafe temperature or sensor fault, the unit activates its 2 change-over output contacts, which can be used to trip a contactor and safely shut down the motor, as well as provide signaling to a control system.

The 3RN1012-1BM00 is supplied with 230 V AC and offers flexible reset options, including Manual, Auto, or Remote reset. It is designed for easy installation on a 35mm DIN rail. This thermistor motor protection unit is a vital component for preventing costly motor damage and downtime, especially for motors operating under challenging conditions like high ambient temperatures, frequent starts, or operation with frequency converters.

Key Characteristics:

• Function: Thermal overload protection for motors using PTC thermistors.
• Sensor Input: Monitors PTC thermistor circuits.
• Fault Monitoring: Detects short circuits and open circuits in the thermistor circuit.
• Output Contacts: 2 change-over contacts (2 C/O).
• Supply Voltage: 230 V AC.
• Reset: Selectable Manual, Auto, or Remote reset.
• Mounting: 35mm DIN Rail.
• Type: Evaluation unit for thermistor protection.

The Siemens SIRIUS 3RN1012-1BM00 provides dependable temperature-based motor protection for increased operational safety and equipment longevity.