Square D XB4BA51 Push-button Switch Momentary No 0.87 in

Product Description

The SQUARE D XB4BA51 is a momentary-action push-button switch designed for industrial control panel and machine wiring applications. It features a 22 mm (0.87 inch) mounting hole diameter and a flush-style, round yellow metal bezel. The contact configuration is normally open (NO), and actuation is momentary, meaning the circuit closes only while the operator depresses the button and returns to open upon release. The screw-clamp terminal type provides a reliable, tooled connection to control wiring. At 1.7 pounds, the unit is constructed with a metal bezel for durability in demanding environments.

This switch is suited for use in industrial and commercial control panels, motor starters, conveyor systems, and general-purpose machine control circuits. It is rated NEMA 4X and NEMA 13, making it appropriate for wash-down, dust-tight, and corrosion-resistant enclosure installations. Licensed electricians and industrial control technicians are the primary installers. The flush button profile reduces the risk of accidental actuation in crowded panel environments.

Key Features

• Momentary (MO) operation with normally open (NO) contact configuration
• 22 mm (0.87 inch) mounting hole diameter for standard panel cutouts
• Flush-style round yellow push button with metal bezel construction
• Screw-clamp terminals for secure, tool-terminated wiring connections
• NEMA 4X and NEMA 13 rated for wash-down and dust-tight environments
• Shock-resistant and vibration-resistant construction for industrial service
• Non-illuminated operator

Compatibility

Designed as an OEM-style replacement or new-installation push-button switch for standard 22 mm panel cutouts in industrial control enclosures and motor control centers.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC Article 430 and applicable local codes. Disconnect and lock out all power to the control panel before mounting or wiring this switch. Screw-clamp terminals require a flat-blade screwdriver and should be tightened to the terminal manufacturer specification noted in the product documentation. Verify NEMA enclosure rating compatibility before installing in wash-down or outdoor locations.