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Siemens 3RN2012-2BA30 — Process / Temperature Controllers

Siemens 3RN2012-2BA30 SIRIUS Thermistor Motor Protection Rel

MPN3RN2012-2BA30
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Siemens SIRIUS 3RN2012-2BA30 thermistor motor protection relay, standard evaluation unit with ATEX approval, open-circuit and short-circuit detection, non-volatile error memory, IP20.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RN2012-2BA30 — Identification
ParameterValue
Product functionthermistor motor protection
Product designationThermistor motor protection relay
Product line / brand nameSIRIUS
3RN2012-2BA30 — Electrical
ParameterValue
Rated value (50 Hz)24 ... 24 V
Rated value (60 Hz)24 ... 24 V
3RN2012-2BA30 — Communication
ParameterValue
Electrical connection typespring-loaded terminal (push-in)
3RN2012-2BA30 — Environmental
ParameterValue
Ingress protection (IP rating), wiredIP20
Installation altitude, max.2 000 m
3RN2012-2BA30 — Mechanical
ParameterValue
Fastening methodscrew and snap-on mounting onto 35 mm DIN rail
Mounting positionany
Width22.5 mm
Height100 mm
Depth90 mm
Conductor cross-section, solid20 ... 12
Conductor cross-section, finely stranded (with ferrule)0.5 ... 2.5 mm²
Mounting clearance, top0 mm
Mounting clearance, rear0 mm
Mounting clearance, side0 mm
Mounting clearance, front0 mm

Product details

Key Ratings and Their Meaning

The 3RN2012-2BA30: The MTBF of 97 a and MTTFd of 303 a indicate a high reliability target for continuous operation in industrial environments. These figures are calculated per IEC 61709 and reflect the expected mean time between failures for the electronic assembly, not the connected motor.

Mounts via screw or snap-on onto a 35 mm DIN rail, occupying 22.5 mm width, 100 mm height, and 90 mm depth. This makes it a drop-in fit for standard DIN-rail panels without derating for proximity. An LED display provides visual status indication, and the relay supports both auto-reset and external reset functions.

Frequently asked questions

What is the MTBF of the 3RN2012-2BA30?

The listed MTBF is 97 a (years), and the MTTFd is 303 a, calculated per IEC 61709 for the electronic assembly.

What compliance documentation does Siemens provide for this relay?

Siemens provides RoHS, REACH, and EU Declaration of Conformity documentation for the SIRIUS 3RN2 series. The relay also carries ATEX approval for explosive atmospheres.

What are the mounting dimensions and clearances?

The relay is 22.5 mm wide, 100 mm high, and 90 mm deep. It mounts on a 35 mm DIN rail with zero clearance required on all sides (upwards, downwards, forwards, backwards, and at the side).

Does the 3RN2012-2BA30 have open-circuit and short-circuit detection?

Yes, it is a standard evaluation unit with ATEX approval that includes open-circuit and short-circuit detection in the sensor circuit, plus non-volatile error memory.

MPN
3RN2012-2BA30