Siemens 3RV2901-1E SIRIUS Auxiliary Switch Transverse 1NO+1NC Screw

The Siemens 3RV2901-1E (MLFB: 3RV2901-1E) is a SIRIUS transverse auxiliary switch with 1 NO + 1 NC instantaneous contact, designed for plug-in mounting on SIRIUS 3RV2 circuit breakers in sizes S00, S0, S2, and S3. Rated at 300 V insulation voltage with 4 kV surge voltage resistance, it connects via screw-type terminals accepting 0.5-2.5 mm² conductors.

Technical specifications:

• MLFB: 3RV2901-1E
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type designation: 3RV29
• Contact arrangement: 1 NO + 1 NC instantaneous
• Compatible circuit breaker sizes: S00, S0, S2, S3
• Rated insulation voltage: 300 V
• Surge voltage resistance: 4 kV
• Operational current AC-12 (24 V / 230 V): 2.5 A
• Operational current AC-15 (24 V): 2 A / (230 V): 0.5 A
• Operational current DC-13 (24 V): 1 A / (48 V): 0.3 A / (60 V): 0.15 A
• IP rating (front): IP20 per IEC 60529, finger-safe
• Degree of pollution: 3
• Operating temperature: -20 ... +60 °C
• Storage temperature: -50 ... +80 °C
• Mounting: plug-in fixing, transverse design
• Terminal type: screw-type
• Connectable conductor: solid/stranded 0.5-2.5 mm², AWG 20-14
• Dimensions (W x H x D): 45 x 12 x 17 mm
• Net weight: 17.5 g
• Certifications: CE, UL, CSA, CCC

Features and benefits:

• Transverse mounting orientation allows compact side-by-side installation on 3RV2 circuit breakers
• Finger-safe IP20 protection on front face per IEC 60529 reduces accidental contact risk
• Dual-contact (1 NO + 1 NC) configuration enables simultaneous signalling and interlocking circuits
• Accepts two conductors per terminal (2x 0.5-1.5 mm² or 2x 0.75-2.5 mm²) for flexible wiring
• Plug-in fixing allows tool-free installation directly onto the 3RV2 circuit breaker body

Applications:

• Signalling circuit breaker trip or ON/OFF status to a PLC or control panel
• Interlocking between 3RV2 motor circuit breakers in motor starter assemblies
• Remote indication of breaker state in switchgear and control gear panels
• Auxiliary contact expansion for 3RV2 breakers in sizes S00 through S3

Compliant with IEC 60529 (IP rating). Part of the Siemens SIRIUS 3RV29 range.

Also known as: Siemens 3RV2901-1E, SIRIUS 3RV29 transverse auxiliary switch, 3RV2 auxiliary contact 1NO 1NC.