A limit switch detects when a moving part reaches a position by physical contact. Replacing one means matching how it's actuated, how it wires, and how it mounts.
Actuator head — how it's triggered
- Roller lever (adjustable or fixed) — the most common.
- Plunger (top push) or roller plunger.
- Rod / wobble stick (omnidirectional).
- Fork/lever (stays in position until reset).
Contacts and rating
- Configuration: NO, NC, or both (e.g. 1NO+1NC).
- Snap-action vs slow-action contacts.
- Voltage and current rating of the contacts.
Housing, mounting and connection
- Body style/size: compact, standard (often EN 50047 / EN 50041 footprints), or heavy-duty.
- Housing material and IP rating for the environment.
- Connection: conduit entry with terminals, pre-wired cable, or M12 connector.
We'll cross-reference it
Limit switches from Allen-Bradley, Schneider/Telemecanique (OsiSense), Honeywell (MICRO SWITCH), Omron and Siemens cross-reference when the head, contacts and footprint match. Send us the part number or a photo and we'll quote a replacement.