The KO129BA126 is a single-pole, 3-position keylock switch designed for secure electrical control. It features 45°/90° indexing and is rated for 4A at 125VAC/28VDC or 2A at 250VAC. The switch provides a long electrical life of 10,000 make-and-break cycles at full load and has a dielectric strength of 1KV RMS minimum. Its construction includes silver-plated copper contacts and a 4-disc tumbler mechanism, ensuring reliability. This key switch is ideal for applications requiring keyed access and multiple switching states, such as security systems and industrial control panels.