BS/EN 50047-2019 pdf download.Low-voltage switchgear and controlgear -Control switches – Position switches 30 x55 – Dimensions and characteristics.
— 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. 2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 60947-1:2007, Low-voltage switch gear and controlgear – Part 1: General rules
EN 60947-1:2007/Al :2011, Low-voltage switch gear and controlgear – Part 1: General rules
EN 60947-5-1:2017, Low-voltage switch gear and controlgear – Part 5-1: Control circuit devices and switching elements – Electromechanical control circuit devices
3 Terms and definitions
For the purposes of this document, the following terms and definitions given in EN 60947-5-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at htt:I/www.electropedia.orql
• ISO Online browsing platform: available at http://www.iso.org/obD
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*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
lever arm
part of actuator used to actuate a plunger
3.11
roller lever arm
lever arm, equipped with a free-running cylinder which is suitably shaped to make contact with the object to detect
4 Dimensions
4.1 General
The dimensions shown in Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5 are applicable to switches in a new condition.
The operating point corresponds to the opening of the break contact element. The operating point can dnft 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 4a). Figure 4c) and Figure 5, 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. The manufacturer shall specify the thread the device is fitted with, e.g. M16x1,5 according to ISO 261.BS/EN 50047-2019 pdf download.

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