BS EN 50047 pdf free download
BS EN 50047 pdf free download. Low-voltage switchgear and controlgear – Control switches – Position switches 30 × 55 – Dimensions and characteristics.
1 Scope 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 (42,5×80) 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. 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 switchgear and controlgear – Part 1: General rules EN 60947-1:2007/A1:2011, Low-voltage switchgear and controlgear – Part 1: General rules EN 60947-5-1:2017, Low-voltage switchgear 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 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 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 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 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. The distance between fixing points shall be either (20 ± 0,1) mm or (22 ± 0,1) mm. As an alternative, elongated hole is accepted as shown in Figure 1. 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 5.BS EN 50047 pdf download.
