Siemens 3RH1911-1FA22 Auxiliary Contact Block

Product Description

The SIEMENS 3RH1911-1FA22 is a front-mount auxiliary contact block designed for use with Siemens 3RH and 3RT series contactors and motor starters. It adds supplementary switching contacts to the main contactor, enabling control circuit monitoring, interlocking, and status signaling without occupying the main power poles. The block provides a 2NO plus 2NC contact configuration, making it suitable for ladder logic control circuits and PLC input monitoring. Electrical installers and industrial maintenance technicians work with this component during panel builds, motor control center assemblies, and contactor upgrades.

This auxiliary contact block is intended for front-mount installation on compatible Siemens 3RH1 and 3RT1 series contactors in industrial control panels, motor control centers, and machinery enclosures. Typical applications include conveyor systems, pump controls, compressor starters, and HVAC motor control assemblies where auxiliary switching contacts are required for control or monitoring circuits. Its compact form factor suits high-density panel layouts where side-mount accessories are not practical.

Key Features

• Front-mount design adds auxiliary contacts without requiring side-mount space
• 2NO plus 2NC contact configuration supports interlocking and status signaling
• Compact dimensions allow use in high-density motor control center installations
• Lightweight construction at 0.097 pounds minimizes added load on contactor frame
• Compatible with 3RH1 and 3RT1 series contactors for broad panel application coverage

Compatibility

Designed as a front-mount auxiliary contact block for use with Siemens 3RH and 3RT series contactors and motor starters. Verify contactor frame size and mounting style before installation to confirm fitment.

Installation Notes

Installation should be performed by a licensed electrician following applicable NEC requirements and the panel or equipment manufacturer guidelines. De-energize and lock out the contactor and associated control circuit before attaching or removing the auxiliary contact block. Snap the block onto the front face of the contactor per the contactor mounting instructions and confirm all contacts seat fully before restoring power. Verify contact continuity with a multimeter before returning the circuit to service.

Technical Specifications

• Contact Configuration: 2NO 2NC
• Mount Type: Front Mount
• Length: 1.654 inches
• Width: 1.732 inches
• Height: 2.244 inches
• Weight: 0.097 pounds
• UPC: 75455441579

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RH1911-1FA22