KRONE LSA-PLUS (or simply krone) is an insulation-displacement connector for telecommunications. It is a proprietary European alternative to 110.
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Krone was developed in Berlin in the 1970s by The KRONE Group, a German telecommunications company. In 2004, KRONE was acquired by ADC Telecommunications, an American corporation. ADC was later acquired by Tyco Electronics in 2010.
LSA-PLUS is a German acronym (Lötfrei, Schraubfrei, Abisolierfrei, Preiswert, Leicht zu handhaben, Universell anwendbar, Sicher und schnell) that translates to: no solder, no use of screws, no insulation removal, cost effective, easy to use, universal application, secure and fast.
Compared to 110, krone can be easily identified by its contact slots arranged at a 45 degree angle to the wire. The contacts use silver to inhibit corrosion.