Siemens 51PA8B2 Round Pushbutton

Product Description

The SIEMENS 51PA8B2 is a round pushbutton designed for use in industrial and commercial control panel applications. This type of operator interface component provides a momentary or maintained contact input to control circuits, allowing technicians to start, stop, or signal electrical systems directly at the panel. The 51PA8B2 weighs 0.331 pounds and has a compact profile measuring 0.618 inches in length and 0.311 inches in both width and height, making it well suited for dense panel layouts where space is limited. Electricians and industrial controls technicians are the primary installers of this component.

This round pushbutton is appropriate for residential, commercial, and light industrial control panels, motor control centers, and machine control enclosures. It fits into standard pushbutton mounting cutouts and is used wherever a reliable operator input device is needed to interface with low-voltage control circuits. Applications include HVAC equipment control panels, pump control stations, and general-purpose electrical enclosures requiring a compact, round-format pushbutton operator.

Key Features

• Round pushbutton format fits standard panel cutout sizes
• Compact dimensions of 0.618 x 0.311 x 0.311 inches for dense panel installations
• Lightweight at 0.331 pounds for easy handling and mounting
• Suitable for control panel, motor control, and machine interface applications
• OEM-style design for direct replacement or new installation use

Compatibility

Designed as an OEM-style replacement or new-installation pushbutton operator for standard round-format pushbutton control panel assemblies.

Installation Notes

Installation should be performed by a qualified electrician in accordance with applicable NEC requirements. De-energize and lock out the control panel before removing an existing pushbutton or installing this component. Use appropriate hand tools to secure the operator into the mounting cutout and verify all control circuit connections are firmly terminated before restoring power.

Technical Specifications

• Weight: 0.331 pounds
• Length: 0.618 inches
• Width: 0.311 inches
• Height: 0.311 inches
• UPC: 78308709239

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 51PA8B2