RS Components
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Siemens Motor Evaluation Unit, 110 V ac, 230 V ac

Discontinued product
RS Stock No.:
Mfr. Part No.:


Standard unit with 1N/O & 1N/C contacts, manual trip reset

Standard 22.5mm module width
Wide 24 to 240Vac supply voltage range


!!! Phase-out product !!! This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the preferred successor proposed by the manufacturer: 175-2282 (3RN2011-1BW30)

Siemens 3RN1 Thermistor Relays

3RN1 thermistor relays are a range of thermal protection devices, which when used in conjunction with external PTC thermistors, offer temperature monitoring of electrical drives, transformers and other critical components such as bearings. The 3RN1 range operates on the principle of closed-circuit current and are therefore self monitoring in the event of sensor wire breakage.

Motor Protection ComponentEvaluation Unit
Sensing TypeThermistor
Supply Voltage110 V ac, 230 V ac
Overall Length102mm
Overall Width22.5mm
Overall Depth91mm
Minimum Operating Temperature-25°C
Maximum Operating Temperature+60°C