Siemens 3RH2911-1DA11 SIRIUS Auxiliary Switch 1NO+1NC Lateral

The Siemens 3RH2911-1DA11 is a SIRIUS lateral auxiliary switch with 1 NO and 1 NC instantaneous contact, designed for snap-on mounting onto 3RT2.1 contactors. It carries a 690 V AC insulation voltage rating (pollution degree 3) and 6 kV surge voltage resistance. Terminal contacts 41/42 and 53/54 are assigned to the left side, with 21/22 and 33/34 on the right, connected via screw-type terminals.

Technical specifications:

• MLFB: 3RH2911-1DA11
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type designation: 3RH29
• Contact arrangement: 1 NO + 1 NC (instantaneous)
• Terminal assignment: left 41/42, 53/54; right 21/22, 33/34
• Insulation voltage: 690 V AC (pollution degree 3)
• Surge voltage resistance: 6 kV
• Operational current AC-15 at 690 V: 1 A
• Operational current AC-12 at 230 V: 10 A
• IP rating (front): IP20
• Mechanical service life: 10,000,000 operating cycles
• Electrical endurance: 200,000 cycles at AC-15 / 230 V
• Ambient temperature (operation): -25 to +60°C
• Mounting: snap-on
• Dimensions (W x H x D): 10 x 57.4 x 66 mm
• Weight: 37 g
• Terminal conductors: 0.5-2.5 mm² solid, stranded, or finely stranded (screw-type)
• Compatible with: 3RT2.1 contactors

Features and benefits:

• First laterally mountable design enables flexible assembly alongside 3RT2.1 contactors
• Mirror contact function per IEC 60947-4-1 (with 3RT2) supports safety circuit wiring
• 10,000,000-cycle mechanical service life for long-term reliability
• Compact 10 mm width minimizes DIN rail space in control panels
• Screw-type terminals accept AWG 20-14 and 0.5-2.5 mm² conductors in single or twin configuration

Applications:

• Status signaling and feedback in motor starter circuits
• Safety interlock wiring using the mirror contact function
• Control panel assemblies built around 3RT2.1 contactors
• Industrial automation and motor control center wiring
• Machine control and auxiliary signaling circuits

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

Also known as: Siemens 3RH2911-1DA11, SIRIUS 3RH29 auxiliary switch, Siemens lateral auxiliary contact block.