BS EN 2794-004:2014

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Aerospace series. Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A – UNC thread terminals. Product standard

Published By	Publication Date	Number of Pages
BSI	2014	16

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Description

This European Standard specifies the characteristics of single-pole circuit breakers, temperature compensated with a rated current from 20 A to 25 A, used in aircraft on-board circuits at a temperature between – 55 °C and 125 °C and at an altitude of 15 000 m max.

These circuit breakers are operated by a push-pull type single push button (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
5	Foreword
6	1 Scope 2 Normative references 3 Terms and definitions 4 Dimensions and mass 4.1 Dimensional characteristics
7	Figure 1 — Configuration – Dimensions – Tolerances 4.2 Electrical diagram
8	Figure 2 — Electrical diagram 4.3 Mass 4.4 Panel cut-out 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
9	5.2.3 Recommended tightening torque of connection hardware for installation 5.2.4 Resistance to vibrations 5.2.4.1 Combined test: ambient temperature at 70 C and vibrations 5.2.4.2 Combined test: ambient temperature at 85 C, altitude and vibrations 5.2.5 Resistance to shocks 5.2.6 Mechanical endurance 5.3 Environment characteristics 5.3.1 Humidity 5.3.2 Corrosion 5.3.3 Contaminating liquids 5.3.4 Overvoltage caused by lightning 5.4 Electrical characteristics 5.4.1 Nominal voltage of operational circuits Table 1
10	5.4.2 Voltage drop at Ιn Table 2 5.4.3 Minimum and maximum tripping thresholds Table 3 5.4.4 Overload trip Table 4
11	5.4.5 Short-circuit values Table 5 5.4.6 No-Load and load endurance Table 6 5.4.7 Dielectric rigidity Table 7 5.4.8 Insulation resistance
12	6 Designation 7 Rated current code Table 8 8 Delivery hardware code Table 9
13	9 Marking 10 Technical specification

Additional information

Status	Definitive
Pages	16
Publication Date	2014-01-31
ISBN	978 0 580 83446 2
Standard Number	BS EN 2794-004:2014
Title	Aerospace series. Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A – UNC thread terminals. Product standard
Identical National Standard Of	EN 2794-004:2014
Replaces	BS EN 2794-004:1999
Descriptors	Environment (working), Single, Bolts, Dimensions, Holes, Unified screw threads, Aircraft components, Short-circuit currents, Washers, Designations, Rated current, Circuit-breakers, Nuts, Tolerances (measurement), Quality assurance systems, Mass, Electrical protection equipment, Temperature, Switchgear, Electric terminals, Electrical equipment, Dimensional measurement, Fixing, Height
Publisher	BSI
Committee	ACE/6
ICS Codes	49.060 - Aerospace electric equipment and systems

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BS EN 2794-004:2014

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