Siemens 3RH2911-2FA40 SIRIUS Auxiliary Switch 4NO Spring Terminal

The Siemens 3RH2911-2FA40 is a SIRIUS front-mount auxiliary switch with 4 normally open (NO) instantaneous contacts, designed to snap onto the front of 3RT2 contactors and 3RH2 contactor relays. It uses spring-loaded terminals and is rated up to 10 A at AC-12 and 1 A at AC-15 at 690 V. Positively driven operation and mirror contact functionality make it suitable for safety-critical control circuits.

Technical specifications:

• MLFB: 3RH2911-2FA40
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type designation: 3RH29
• Contact arrangement: 4 NO instantaneous, 0 NC
• Insulation voltage: 690 V (pollution degree 3)
• Surge voltage resistance: 6 kV
• Operational current AC-12 (max): 10 A
• Operational current AC-15 at 690 V: 1 A
• Operational current AC-15 at 230 V: 6 A
• IP rating (front): IP20
• Mechanical service life: 10,000,000 operating cycles
• Electrical endurance: 200,000 cycles (AC-15, 230 V)
• Fastening: snap-on mounting to front
• Terminal type: spring-loaded
• Conductor cross-section: 0.5 ... 2.5 mm²
• AWG range: 20 ... 14
• Dimensions (W x H x D): 36 mm x 41.5 mm x 47.7 mm
• Operating temperature: -25 ... +60 °C
• Storage temperature: -55 ... +80 °C
• Weight: 62 g
• Compatible with: 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4, 3RH2

Features and benefits:

• 4 NO instantaneous contacts provide flexible signal expansion on existing contactors and relays
• Snap-on front mounting allows fast installation directly onto compatible 3RT2 and 3RH2 units
• Spring-loaded terminals accept 0.5 ... 2.5 mm² conductors for tool-free, reliable wiring
• Positively driven operation per IEC 60947-5-1 supports use in safety control circuits
• Mirror contact function per IEC 60947-4-1 (with 3RT2) enables safety monitoring applications
• 10,000,000 mechanical operating cycles for long service life in high-cycle installations

Applications:

• Expanding auxiliary contact capacity on 3RT2 contactors in motor control centers
• Status signaling and feedback loops in PLC-controlled panels
• Safety monitoring circuits requiring mirror contact or positively driven contacts
• Auxiliary control functions in industrial automation switchgear

Compliant with IEC 60947-4-1 and IEC 60947-5-1. Part of the Siemens SIRIUS 3RH29 range.

Also known as: Siemens 3RH2911-2FA40, SIRIUS 3RH29 front auxiliary switch, 3RH2 auxiliary contact block.