Allen-Bradley 800MB-H31B Miniature Selector Switch

Allen-Bradley 800MB-H31B Miniature Selector Switch is a compact, 22.5 mm panel‑mount selector switch in Rockwell Automation’s 800B family, designed to select between two circuit paths in control panels. The H31B designation identifies a 2‑position operator with a Cam B and an operator code of 31, enabling maintained operation and two distinct knob positions when mounted with the appropriate contact block. The 22.5 mm mounting hole allows a slim footprint ideal for crowded enclosures, and the unit is designed to work with standard 800M contact blocks in the same series for straightforward field wiring. Typical applications include mode selection on automated machinery, start/stop routing, or manual override controls in panel‑mounted control stations. The 800MB family is part of Allen‑Bradley’s 22.5 mm selector switch lineup, known for robust mechanical operation in high‑cycle environments; while exact cycle life depends on contact block configurations, related Rockwell data for the 800MR‑H31B variant lists a life specification approaching 200,000 cycles. For reliable installation, verify compatibility with the correct mounting hardware and ensure the enclosure provides protection appropriate for your environment.