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BS EN 3774-004:2014

BS EN 3774-004:2014

$102.76

Aerospace series. Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A – UNC thread terminals. Product standard

Published By Publication Date Number of Pages
BSI 2014 16
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This European Standard specifies the characteristics of three-pole circuit breakers, temperature compensated with a rated current from 1 A to 25 A, used in aircraft on-board circuits at a temperature between ? 55 °C and 125 °C for ratings ? 15 A and ? 55 °C to 90 °C for ratings > 15 A and at an altitude of 22 000 m max. These 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.

PDF Catalog

PDF Pages PDF Title
5 Foreword
6 1 Scope
2 Normative references
3 Terms and definitions
7 4 Dimensions and mass
4.1 Dimensional characteristics
Figure 1 — Configuration – Dimensions – Tolerances
8 4.2 Electrical diagram
Figure 2 — Electrical diagram
4.3 Mass
4.4 Panel mounting
5 Characteristics
5.1 Material, surface treatment
9 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 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
10 5.4 Electrical characteristics
5.4.1 Nominal voltage of operational circuits
Table 1
5.4.2 Voltage drop at Ιn and low current
Table 2
5.4.3 Minimum and maximum tripping thresholds
Table 3
11 5.4.4 Overload trip
Table 4
5.4.5 Short-circuit values
Table 5
12 5.4.6 No-load and load endurance
Table 6
5.4.7 Dielectric rigidity
Table 7
5.4.8 Insulation resistance
13 6 Designation
7 Rated current code
Table 8
8 Delivery codes
Table 9
14 9 Marking
10 Technical specification

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BS EN 3774-004:2014
$102.76