Fixed body limit switch with steel roller plunger
The XCKML502 is a fixed-body general duty limit switch from Schneider Electric's Telemecanique XCK range, built around a Zamak metal housing that seals to IP66 and NEMA 1/2/4/6/6P/12/13 — meaning it stands up to hose-down washdown, temporary submersion, and corrosive atmospheres in a plant environment. The steel roller plunger actuator gives positive mechanical engagement on cam tracks or machine slides; the snap-action mechanism delivers a clean make-or-break transition at 50 N positive opening force, with tripping at 12 N.
Contact ratings that govern the circuit
Contact configuration is 2NO-2NC — four poles total, with the normally-closed pair providing a positive-break safety path per EN/IEC 60947-5-1. The 240 VAC rating at 3 A is the thermal current; at 250 VDC the contacts are rated 0.27 A, a steep derating that reflects DC arc extinction limits in a snap-action switch. Screw clamp terminals accept solid or stranded wire without special tooling — the connection is field-serviceable, not crimp-on. Operating temperature spans -13 to 158 °F (-25 to 70 °C), covering most indoor industrial enclosures and unheated outdoor cabinets. Approvals stack includes UL 508, CSA C22.2, CE, and CCC — the switch is accepted in North American, European, and Chinese panels without additional certification paperwork.
Sourcing and lifecycle status
RoHS compliant per the listing, with a California Proposition 65 warning for DINP and DIDP phthalates in the enclosure materials — standard for Zamak die-cast components with plastic seal elements.