Siemens 3RH29111HA10 Auxiliary Switch 1NO

Product Description

The SIEMENS 3RH29111HA10 is an auxiliary switch contact block with a 1 normally open (1NO) contact configuration. It is designed to mount directly onto compatible Siemens contactors and relay assemblies, expanding their switching capacity for control circuit applications. Electricians and industrial controls technicians install this block to add auxiliary contact positions to existing contactor assemblies without replacing the primary switching device. At 0.101 pounds, it is a compact add-on component suited for panel and enclosure work.

This auxiliary switch block is used in residential, commercial, and light industrial electrical control panels. It attaches to the side or front of a compatible Siemens contactor to provide an additional 1NO signal contact for interlocking, indication, or control logic functions. Typical applications include motor starter panels, HVAC control circuits, and machine control enclosures where additional contact points are required on an existing contactor without increasing panel footprint.

Key Features

• 1 normally open (1NO) contact configuration for control circuit expansion
• Direct snap-on or screw-mount attachment to compatible Siemens contactor bodies
• Compact, lightweight design at 0.101 pounds for tight panel installations
• Suitable for interlocking, status indication, and auxiliary control logic circuits

Compatibility

Designed as an OEM-style auxiliary contact block for use with compatible Siemens contactor and relay assemblies. Verify mounting interface and contact ratings against the primary contactor specifications before installation.

Installation Notes

A licensed electrician should install this auxiliary switch block in accordance with NEC requirements for control circuit wiring. De-energize and lock out the panel before attaching or removing any contact block from a contactor assembly. Confirm that the auxiliary block seating tabs are fully engaged before restoring power. Do not exceed the control circuit voltage and current ratings of the contact block.

Technical Specifications

• Contact Configuration: 1 Normally Open (1NO)
• Weight: 0.101 pounds

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RH29111HA10