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 four types of position switches with the following actuator types: – roller lever actuator (form A); – rounded plunger actuator (form B); – roller plunger actuator (form C); – roller 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.