BS EN 50041:2019 pdf free.Low-voltage switchgear and controlgear -Control switches – Position switches 42,5 x 80- Dimensions and characteristics.
3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 60947-5-1:2017 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http://www.electropedia.org/
ISO Online browsing platform: available at http://www.iso.org/obp 3.1 enclosure part providing a specified degree of protection of equipment against certain external influences and a specified degree of protection against approach to or contact with live parts and moving parts 3.2 operating point position of the actuator in which the contact state changes when the position switch is activated 3.3 reset point position of the actuator in which the contact state changes when the position switch is deactivated 3.4 differential travel distance (in millimetres) between the operating and reset points 3.5 lever part of actuator used for rotative movement 3.6 roller lever lever, equipped with a free-running cylinder, which is suitably shaped to make contact with the object to detect
3.7 plunger piston which transmits the movement or the force to the contact of the position switch 3.8 rounded plunger plunger with a round end 3.9 roller plunger plunger, equipped with a free-running cylinder, which is suitably shaped to make contact with the object to detect 3.10 rod lever bar actuating mechanism 4 Dimensions 4.1 General The dimensions shown in Figure 1, Figure 2，Figure 3, Figure 4a, Figure 4b, Figure 4c Figure 5, Figure 6, Figure 7a and Figure 7b are applicable to switches in a new condition. The operating point corresponds to the opening of the break contact element. The operating point can drift during the life of the switch. The manufacturer shall indicate the direction of the drift. The differential travel of a position switch with independent mechanism shall be stated by the manufacturer, it is shown as H in Figure2, Figure 3, Figure4, Figure 6 and Figure 7, and differs dependent upon the type of actuator. Apart from the dimensions indicated, the design of these devices is not restricted. Dimensions are given in millimetres. 4.2 Enclosure Enclosures shall meet the requirements given in EN 60947-5-1 with the following additions: Enclosures shall be equipped with a threaded hole for a cable entry that has to support a maximum cable diameter of 12 mm. The manufacturer shall specify the thread the device is fitted with, e.g. M20x1,5 according to ISO 261.BS EN 50041 pdf download.