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The SCHNEIDER ELECTRIC XB4BA921 is a non-illuminated, flush-style push-button switch designed for industrial and commercial control panel applications. It features a round, black operator button mounted through a 22 mm hole, with a chromium-plated metal bezel and a Zamak fixing collar for durable, corrosion-resistant construction. The XB4BA921 meets a broad range of international electrical standards, making it suitable for demanding environments where NEMA 4X and NEMA 13 ratings are required. Electricians and control panel builders install this switch in machine control stations, operator interface panels, and process equipment enclosures.
This push-button switch is intended for use in industrial control circuits where a compact, flush-profile operator is preferred. Its 22 mm mounting hole diameter is a widely used industry standard, fitting common panel cutouts in both new builds and replacement applications. The non-illuminated configuration suits applications where indicator lighting is provided by separate pilot devices or is not required by the control design. It is appropriate for both light-duty and heavy-duty machine control environments in manufacturing, utilities, and process industries.
Designed as an OEM-style replacement or new-installation push-button switch for industrial control panels using the standard 22 mm mounting hole format.
Installation should be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. De-energize and lock out the control panel before installing or replacing this switch. Verify that the panel cutout matches the 22 mm mounting hole diameter before installation. Confirm contact block compatibility and torque the fixing collar by hand to the manufacturer specification documented in the product datasheet.
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