This document applies to certain position switches with automatic return actuator, the standardized dimensions of which and the characteristics necessary for their application are given below. A larger size (42,5x80) is standardized in EN 50041. This document includes the four following types: Roller lever (form A); Rounded plunger (form B); Plunger with roller (form C); Rod lever arm (form E). This document is covering devices fitted with either independent (snap) action contact elements, designated (1), or dependent (slow make and break), designated (2) in Clause 5.