Siemens 3RH1911-1FA31 Auxiliary Contact Block

Product Description

The SIEMENS 3RH1911-1FA31 is an auxiliary contact block designed to expand the switching capacity of compatible contactors and relay assemblies in industrial control applications. This block provides three normally open (NO) and one normally closed (NC) contact configuration, referenced by the AL92F3 designation. Electrical control technicians and industrial electricians install this block as a side-mount or front-mount add-on to existing motor starters or control relays where additional signal or interlocking contacts are required. At 0.097 pounds and compact dimensions, it fits into tight panel layouts without adding significant bulk.

This auxiliary contact block is used in industrial and commercial electrical control panels, motor control centers, and automation enclosures where supplemental switching contacts are needed. Typical applications include interlocking circuits, status feedback wiring, PLC input signals, and safety shutdown logic. It is intended for installation by qualified electricians or industrial controls technicians working on low-voltage control circuit wiring.

Key Features

• 3 NO / 1 NC contact configuration (AL92F3) for flexible interlocking and feedback wiring
• Compact form factor at 1.654 inches x 1.732 inches x 2.244 inches
• Lightweight construction at 0.097 pounds for space-constrained panel installations
• Designed as an add-on auxiliary block for compatible Siemens contactor and relay platforms
• Supports supplemental switching functions without replacing the primary contactor

Compatibility

Designed as an OEM-style auxiliary contact block for use with compatible Siemens contactors and control relays. No specific model compatibility data was provided in the product input; verify fitment against the target contactor series before ordering.

Installation Notes

Installation should be performed by a qualified electrician in accordance with applicable NEC requirements and the equipment manufacturer's wiring diagrams. De-energize and lock out the control panel before attaching or removing any auxiliary contact block. Confirm that the contact block snaps fully and securely onto the contactor or relay before restoring power. Do not exceed the rated switching capacity of the contact block for the intended circuit.

Technical Specifications

• Contact Configuration: 3 NO / 1 NC
• Dimensions (L x W x H): 1.654 inches x 1.732 inches x 2.244 inches
• Weight: 0.097 pounds
• UPC: 75455441581

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RH1911-1FA31