Siemens 3RH2911-1HA22 SIRIUS Auxiliary Switch 2NO+2NC Front 690V

The Siemens 3RH2911-1HA22 is a SIRIUS front-mounted auxiliary switch with 2 NO + 2 NC instantaneous contacts, designed to snap onto the front of 3RT2 contactors and 3RH2 contactor relays. It provides positively driven operation per IEC 60947-5-1 and a mirror contact function per IEC 60947-4-1 with 3RT2, supporting safety-critical monitoring and interlocking circuits up to 690 V.

Technical specifications:

• MLFB: 3RH2911-1HA22
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Auxiliary switch, front-mounted (snap-on)
• Contact arrangement: 2 NO + 2 NC (instantaneous)
• Insulation voltage: 690 V (pollution degree 3)
• Surge voltage resistance: 6 kV
• Operational current AC-15 at 690 V: 1 A
• Operational current AC-12: 10 A at 24 V / 230 V
• Operational current AC-15: 6 A at 24 V / 230 V; 3 A at 400 V
• IP rating (front): IP20
• Mechanical service life: 10,000,000 operating cycles
• Electrical endurance: 200,000 operating cycles (AC-15, 230 V)
• Operating temperature: -25 to +60 °C
• Storage temperature: -55 to +80 °C
• Terminals: Screw-type
• Conductor cross-section: 0.5 to 2.5 mm² (solid, stranded, finely stranded)
• AWG range: 20 to 14
• Dimensions (WxHxD): 36 x 37.5 x 43.7 mm
• Net weight: 55 g
• Compatible with: 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4, 3RH2

Features and benefits:

• Mirror contact per IEC 60947-4-1 (with 3RT2) enables safe monitoring of main contact state
• Positively driven operation per IEC 60947-5-1 ensures reliable feedback in safety circuits
• High mechanical service life of 10,000,000 operating cycles reduces maintenance frequency
• Snap-on front mounting for tool-free assembly onto compatible contactors and relays
• Contact reliability of 1 faulty switching per 100 million at 17 V / 1 mA, suitable for low-level signal circuits

Applications:

• Safety interlocking in motor starter assemblies based on 3RT2 contactors
• Status monitoring and feedback circuits on 3RH2 contactor relays
• Industrial automation control panels requiring positively driven auxiliary contacts
• Low-level signal monitoring applications demanding high contact reliability

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 3RH2911-1HA22, SIRIUS 3RH29 front auxiliary contact block, 2NO 2NC auxiliary switch for 3RT2 contactor.