The Square D Telemecanique XCKM121H29 is a general-duty compact limit switch from the Osiswitch family, built with a ZAMAK zinc alloy body and a thermoplastic roller lever plunger actuator. The 1NO-1NC contact block is rated 240 VAC at 3 A and 250 VDC at 0.27 A — the DC rating is the one to watch for inductive loads like small solenoids or DC relays, where the 0.27 A ceiling governs the actual switching capacity, not the higher AC figure. The snap-action, spring-return mechanism gives a defined pretravel of 4.6 mm and differential travel of 2.2 mm, so the switch makes and breaks cleanly at a repeatable position.
Where it fits — enclosure and connection
The enclosure carries NEMA 1/2/4/6/6P/12/13 and IP66 ratings, meaning it seals against hose-directed water and submersion to a limited depth — suitable for washdown zones in food processing or outdoor conveyor lines. The ISO M20 x 1.5 cable gland entry accepts standard metric conduit fittings; the screw-clamp terminals inside accept solid or stranded wire without ferrules.