Allen-Bradley 808-GL1A4 Speed Switch Assembly

Allen-Bradley 808-GL1A4 Speed Switch Assembly is an electro‑mechanical speed sensing switch from Rockwell Automation’s Bulletin 808 family that delivers a defined contact signal when a shaft reaches its preset speed. The GL1A4 variant specifies a switching range of 15–60 rpm, enabling precise speed detection in low‑speed applications such as machine tools, conveyor sequences, and fans or pumps. The 808 speed switches are designed for plug‑in and anti‑plug control circuits and are offered in Type 1, 4/13 and enclosure configurations, with mounting brackets available for panel or base mounting. Typical mechanical features include double‑seal, long‑life precision bearings and four mounting arrangements to suit different installations. In operation, shaft speeds can reach up to 2000 rpm for the family, with the 15–60 rpm window tailored to slower rotating equipment; the device is compatible with standard low‑voltage control circuits and can be used with optional safety accessories such as a lockout solenoid. Certifications often associated with 808 switches include UL Listed, CE Marked, CSA Certified, and UKCA Marked where applicable.