The Siemens 3RH2911-2FA04 is a SIRIUS front-mounted auxiliary switch featuring 4 NC instantaneous contacts with spring-loaded terminals. It snaps directly onto the front of 3RT2 contactors and 3RH2 contactor relays to expand auxiliary contact capacity. Rated at 690 V insulation voltage with 6 kV surge voltage resistance.

Technical specifications:

• MLFB: 3RH2911-2FA04
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Auxiliary switch, front-mounted
• Contact arrangement: 4 NC (normally closed), instantaneous
• Insulation voltage: 690 V
• Surge voltage resistance: 6 kV
• Operational current (AC-15, 690 V): 1 A
• Operational current (AC-12, 24 V / 230 V): 10 A
• Operational current (AC-15, 230 V): 6 A
• IP rating: IP20 (front)
• Mechanical service life: 10,000,000 operating cycles
• Electrical endurance (AC-15, 230 V): 200,000 operating cycles
• Ambient temperature (operation): -25 to +60C
• Mounting: Snap-on to front of 3RT2.1 / 3RH2
• Terminals: Spring-loaded, 0.5 to 2.5 mm
• Dimensions (W x H x D): 36 x 41.5 x 47.7 mm
• Weight: 0.061 kg

Features and benefits:

• Mirror contact function per IEC 60947-4-1 (with 3RT2) for safety circuit monitoring
• Positively driven operation per IEC 60947-5-1
• Contact reliability: 1 faulty switching per 100 million operations at 17 V, 1 mA
• Spring-loaded terminals accept 0.5 to 2.5 mm solid or stranded conductors without tools
• 10,000,000 mechanical operating cycles for extended service life

Applications:

• Auxiliary signaling and status indication on 3RT2 motor contactors
• Safety interlocking circuits requiring positively driven NC contacts
• Mirror contact monitoring per IEC 60947-4-1 in motor protection panels
• Auxiliary contact expansion on 3RH2 contactor relays
• Low-energy signal circuits down to 17 V, 1 mA

Compliant with IEC 60947-4-1 (mirror contact) and IEC 60947-5-1 (positively driven operation). Part of the Siemens SIRIUS 3RH29 range.

Also known as: Siemens 3RH2911-2FA04, SIRIUS 3RH29 auxiliary switch, 3RH2911 4NC front contact block.