The Square D XCKJ10513H7 is a heavy duty, non-plug-in limit switch from the Osiswitch XCKJ family. It uses a rotary head with a steel roller lever actuator, spring-return snap-action mechanism, and SPDT contact configuration. Rated 240 VAC at 10 A and 250 VDC at 0.27 A, it handles motor control and position sensing in industrial machinery where a rugged metal-bodied switch is required. Enclosure rating is NEMA 1/2/4/12 and IP66, meaning it's dust-tight and protected against hose-down water — suitable for washdown environments and outdoor enclosures. The body is ZAMAK zinc alloy, a die-cast material that resists corrosion and impact better than plastic-bodied limit switches.
Contact rating: 240 VAC 10 A is the thermal current for AC resistive/inductive loads; the 250 VDC 0.27 A figure is the DC switching limit for the same contacts. DC arcs are harder to extinguish, so the current is derated sharply — don't expect to switch a 10 A DC motor with this switch. The SPDT configuration gives one normally-open and one normally-closed set, so you can wire both a safety signal and a status feedback from a single actuator. Mechanical travel: 23° pretravel before the contacts snap, 11° differential (the angle between make and break), and 90° total travel. That 23° pretravel means the lever must rotate at least that far to change state — useful for applications where you need a deliberate actuation, not a brush-by. Operating force is 33.3 oz-in, a moderate torque that won't trip from vibration but will respond to a positive cam or dog. Connection is via a 1/2-inch NPT cable gland — standard conduit size for industrial control panels. No pigtails or quick-disconnect; you land the wires inside the switch body. Operating temperature range is -13 to 158 °F (-25 to 70 °C), covering most factory-floor conditions but not freezer or oven applications.
UL and CSA listed — accepted for North American installations. The switch also complies with EN/IEC 60204-1 (safety of machinery — electrical equipment) and EN/IEC 60947-5-1 (low-voltage switchgear — control circuit devices and switching elements). That IEC 60947-5-1 standard is the one that governs limit switches for industrial use; it covers endurance, dielectric strength, and making/breaking capacity.