MSK-S-LED is an order code for a slot magnetic switch (reed switch) with an integrated LED indicator made by Hans & Jos. Kronenberg GmbH. According to the manufacturer's product specification:

• MSK = Slot magnetic switch with connection cable.
• S-LED = Normally open (NO) contact with LED ("Schließer mit LED" in German). The contact closes when actuated by a ferromagnetic steel plate, and the LED indicates the switching state.

Typical features include:

• Reed contact in an inert gas atmosphere for reliable switching.
• Integrated LED status indication.
• 2 m connection cable.
• Quiet, contactless operation.
• Commonly used in elevator systems and industrial automation.

If you're looking for the wiring diagram, pinout, electrical specifications, or a replacement part for MSK-S-LED, let me know and I can provide those details.