BS EN 50041 pdf free download

BS EN 50041-2019 pdf free download.Low-voltage switchgear and controlgear – Control switches – Position switches 42,5 x 80 – Dimensions and characteristics.
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 Figure 2, Figure 3, Figure 4, 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.
4.3 Actuator
4.3.1 General
Actuators for position switches shall meet the following constructional requirements. The characteristic for the operation of the position switch (actuator and enclosure including the contact elements) shall be within the range stated in Figure 2 to Figure 7a and Figure 7b.
Example 1 designation of a position switch 42,5×80 with a roller lever actuator (form A) with independent action mechanism:
Position switch EN 50041 — A1
Example 2 designation of a position switch 42,5×80 with rod lever actuator (form D) with dependant make and break mechanism:
Position switch EN 50041 — D2
6 Contact unit
Electrical characteristics shall conform to those of EN 60947-5-1.
Position switches shall have at least one make contact (i.e. normally open) and one break contact (i.e. normally closed). Position switches with two break contacts can also be provided.
7 Terminal marking
The terminal marking shall be in accordance with EN 60947-5-1.
8 Terminal for protective conductor
Position switches with metal enclosures shall have a terminal for the protective conductor; this terminal shall be mounted inside the enclosure in the immediate vicinity of the cable entry and marked in accordance with 7.1.10.3 of EN 60947-1:2007.
9 Degree of protection
The minimum degree of protection required shall conform to IP 65, tested in accordance with Annex C of EN 60947-1:2007 and EN 60947-1:2007/A1:2011.BS EN 50041 pdf download.