BS EN 4838-004:2018

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Aerospace series. Arc fault circuit breakers, single-pole, temperature compensated, rated current 3 A to 25 A. 115 V a.c. 400 Hz constant frequency – With signal contact. Product standard

Published By	Publication Date	Number of Pages
BSI	2018	16

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Description

This European Standard specifies the required characteristics for single-pole, arc fault circuit breakers rated currents from 3 A to 25 A, switching capacity 65 In, for use in aircraft electrical systems. Their operating temperatures are between ? 40 °C to 85 °C at a maximum altitude of Z = 15 000 m. The thermal protection is temperature compensated and operates between ? 55 °C and 125 °C. These arc fault circuit breakers are operated by a push-pull type single pushbutton (actuator), with delayed action “trip-free” tripping. They will continue to function up to the short-circuit current.

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PDF Pages	PDF Title
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6	1 Scope 2 Normative references 3 Terms and definitions
7	4 Dimension and mass 4.1 Dimensional characteristics
8	4.2 Electrical diagram 4.3 Mass 4.4 Panel mounting
9	5 Characteristics 5.1 Material, surface treatment 5.2 Mechanical characteristics 5.2.1 Fasteners 5.2.2 Recommended tightening torque of attaching nut for installation 5.2.3 Recommended tightening torque of connection hardware for installation 5.2.4 Recommended tools for contacts of auxiliary contact insertion and extraction 5.2.5 Resistance to vibrations 5.2.5.1 Combined test: ambient temperature at 70 °C and vibrations 5.2.5.2 Combined test: ambient temperature at 85 °C, altitude and vibrations 5.2.6 Resistance to shocks 5.2.7 Mechanical endurance 5.3 Environment characteristics 5.3.1 Humidity 5.3.2 Corrosion 5.3.3 Contaminating liquids
10	5.3.4 Susceptibility towards electrical perturbations 5.4 Electrical characteristics 5.4.1 Nominal voltage of operational circuits 5.4.2 Voltage drop at In and low current 5.4.3 Minimum and maximum tripping thresholds
11	5.4.4 Overload trip 5.4.5 Short-circuit values
12	5.4.6 No-load and load endurance 5.4.7 Dielectric rigidity 5.4.8 Insulation resistance 5.5 Arc fault performance
13	6 Designation 7 Rated current code 8 Delivery hardware codes
14	9 Marking 10 Technical specification

Additional information

Status	Definitive
Pages	16
Publication Date	2018-07-23
ISBN	978 0 580 99399 2
Standard Number	BS EN 4838-004:2018
Title	Aerospace series. Arc fault circuit breakers, single-pole, temperature compensated, rated current 3 A to 25 A. 115 V a.c. 400 Hz constant frequency – With signal contact. Product standard
Identical National Standard Of	EN 4838-004:2018
Descriptors	Fibre optic cables, Connectors (electric), Environmental testing, Flexible materials, Fibre optics, Marking, Dimensions, Weight (mass), Electrical insulating materials, Hose connectors, Flexible tubing, Clamps (mechanical), Terminology, Optical fibres, Heat-shrinkable materials, Classification systems, Torque, Pipe connections, Size, Electric cables, Damp-air tests, Cable sheaths, Solid electrical insulating materials, Electrical insulation, Designations, Sleeving (electrical), Hose clips, Aircraft engineering, Aircraft components, Damp-heat tests, Temperature, Electric connectors
Publisher	BSI
Committee	ACE/6
ICS Codes	49.060 - Aerospace electric equipment and systems

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BS EN 4838-004:2018

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