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Siemens 3RN2012-1BW31 Thermistor Motor Protection Relay

Siemens 3RN2012-1BW31 thermistor motor protection relay.

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ManufacturerSiemens

Part number3RN2012-1BW31

Type Thermistor Motor Protection Relay

Enclosure Width 22.5 mm

Terminals Screw

Contacts 2 Changeover (CO)

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Veteran-owned

CAGE: 9NK75

Thermistor Motor Protection 22.5mm Slimline Design 2 CO Contacts 24-240V AC/DC Supply Manual/Auto/Remote Reset Wire-Break and Short-Circuit Monitoring

Product description

The Siemens 3RN2012-1BW31 is a thermistor motor protection relay, serving as a standard evaluation unit. It features a slim 22.5 mm enclosure with screw terminals and provides 2 changeover (CO) contacts. The relay is bistable and operates with a supply voltage (Us) ranging from 24 V to 240 V AC/DC.

Key functionalities include manual/auto/remote RESET options, dual LEDs for status indication (ready/tripped), and electrical isolation. It also incorporates wire-break monitoring and short-circuit monitoring for enhanced motor protection. The non-volatile memory retains trip status.

Stanlo Automation, a veteran-owned surplus distributor, offers the Siemens 3RN2012-1BW31. Ensure your motors are protected with this reliable and feature-rich protection relay, available from our stock.

Technical specifications

Type	Thermistor Motor Protection Relay
Enclosure Width	22.5 mm
Terminals	Screw
Contacts	2 Changeover (CO)
Supply Voltage (Us)	24-240 V AC/DC
Reset	Manual/Auto/Remote
Indicators	2 LEDs (Ready/Tripped)
Features	Wire-break monitoring, Short-circuit monitoring, Electrical isolation

Common applications

Motor Protection

Industrial Control Panels

Machine Building

Automation Systems

Pump Stations

HVAC Systems

Compatible systems

Motors with integrated PTC thermistors Control panels Automation systems

Also known as

Siemens motor protection unit, 3RN2012 relay, Thermistor evaluation unit

Replaces / compatible with

Designed as a standard evaluation unit for thermistor-based motor protection systems. Compatible with various motor types and control circuits.

Technical note

Expert tip

Ensure that the thermistor probes are correctly wired and have adequate resistance for proper detection of motor overheating and fault conditions.

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Frequently asked questions

What reset modes are available for the Siemens 3RN2012-1BW31 motor protection relay?

The Siemens 3RN2012-1BW31 offers manual, auto, and remote reset options. This flexibility allows for integration into various control schemes for efficient motor restarting after a fault.