Siemens 3RH1911-2FA20 Auxiliary Contact Block

Product Description

The SIEMENS 3RH1911-2FA20 is a front-mount auxiliary contact block designed to expand the switching capacity of compatible Siemens contactors and relay assemblies. This accessory snaps onto the front face of a base contactor, adding supplementary control contacts to the circuit without requiring additional panel space. Electricians and control panel builders install this block when an application demands more auxiliary contact points than the base unit provides. It is a standard component in motor control centers, machine control panels, and industrial automation wiring.

This auxiliary contact block is suited for commercial and industrial electrical installations where contactor-based motor starters or control relays are used. Typical applications include HVAC motor control, pump and fan starters, conveyor systems, and process automation panels. The front-mount design keeps the assembly compact and accessible for wiring in tight enclosures.

Key Features

• Front-mount configuration adds auxiliary contacts without increasing footprint
• Snap-on attachment to compatible Siemens base contactors for tool-free installation
• Compact dimensions suit dense control panel layouts
• Lightweight construction at 0.082 pounds
• OEM Siemens part ensuring direct form-fit-function replacement

Compatibility

Designed as an OEM-style front-mount auxiliary contact block for compatible Siemens contactor and control relay assemblies. Verify base contactor model acceptance of front-mount auxiliary blocks before ordering.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements and local codes. De-energize and lock out the panel before attaching or removing auxiliary contact blocks. Confirm the base contactor is rated to accept front-mount accessories before installing. Inspect contact terminations for proper seating and torque per the panel assembly documentation before returning the circuit to service.

Technical Specifications

• Weight: 0.082 pounds
• Length: 2.008 inches
• Width: 1.772 inches
• Height: 2.520 inches
• UPC: 75455441598

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RH1911-2FA20