DIN EN 4838-001 pdf free download

DIN EN 4838-001 pdf free download.Luft- und Raumfahrt- Storlichtbogen-Schutzschalter, einpolig, temperaturkompensiert, Nennstrome von 3 A bis 25 A- 115 V Wechselstrom, 400 Hz Konstantfrequenz – Teil 001: Technische Lieferbedingungen.
3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 3841-100 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 4 Description These arc fault circuit breakers are operated by a “push-pull” type single pushbutton (actuator). In case of thermal overload or arc fault, electrical contacts must open. In both cases tripping time is related according to the type of default. In any operating state a “trip-free” tripping is ensured. 5 Design 5.1 Materials 5.1.1 Metallic materials All metallic parts shall be resistant to corrosion or finished against corrosion. When dissimilar materials are in close contact, an adequate protection against corrosion shall be used so that the electromotive force of the galvanic couple does not exceed 0,25 V. When bimetals are used, an eventual corrosion shall not affect the good operation of the circuit breaker. 5.1.2 Insulation materials The insulating parts shall be made of auto-extinguishing or non-flammable materials; they shall not emit damaging or explosive vapours, even in presence of fire or internal electric arc. They shall be insensitive to moulds and micro-organisms action. Application of any material or protective coating, which might crack, break or flake shall be forbidden. Materials which are not specified or which are not specially described shall be as light as possible for the requested use. Materials shall be selected according to security criteria (toxicity, smoke density) as defined in contractual documents. 5.2 Design 5.2.1 Insulating box The insulating box shall integrate besides the mechanism, the connection and attachment unit. 5.2.2 Free release mechanism Design of circuit breaker mechanism shall allow free release; i.e. the circuit breaker cuts out in case of overload, and remains cut out even if the actuator is kept by force in engaged position. A new engagement of circuit breaker is only possible after a first total release of the control actuator. The operation in these conditions shall not affect further performances of the circuit breaker. 5.2.3 Attachment All visible parts shall be black coloured and non-reflective. 5.2.4 Electrical connection units They shall be able to receive the lugs (or contacts). 5.2.5 Control actuator In engaged position, the visible part of the control actuator shall be of the colour stated in the product standard. In disengaged (or opened) position, the control actuator shall show a white strip. The outer part of this actuator shall be isolated from all energized parts. The control actuator shall not stay in a transition position, or give a false indication about the circuit breaker condition. It shall not be removable. When pushing it, power contacts of the circuit breaker engage and indicating contact opens. When pulling it, power contacts of the circuit breaker open and indicating contact closes. The circuit breaker rating is indicated in indelible white colour on the front part of the control actuator. The product standard gives the digits positioning. 5.2.6 Rating inviolability The circuit breaker shall be designed in such a way that the calibration unit cannot be reached without breaking a sealing. 5.2.7 Clearances and creepage distances The clearances, creepage distances and the minimal space to be foreseen between the energized parts and any other part of the circuit breaker made of conductive material, as well as between the energized parts of opposite polarity, shall be sufficient to avoid any default or arcing in all uses and climatic conditions.DIN EN 4838-001 pdf odwnload.