BS/EN 2794-004-2014 pdf download.Aerospace series Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A Part 004: UNC thread terminals — Product standard.
This BS/EN 2794-004 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 “tñp-f reV tripping.
They will continue to function up to the short-circuit current.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2350, Aerospace series — Circuit breakers — Technical specification
EN 2794-001, Aerospace series — Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A — Part 001: Technical specification
EN 3841-305, Aerospace senes — Circuit breakers — Test methods — Part 305: Short-circuit performance
EN 6113, Aerospace series — Circuit breaker, connecting and attachment hardware 1)
TR 6083. Aerospace series — Cut-outs for installation of electrical components 2)
FED-STD-595B, Colors used in Government Procurement 3)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 2350 apply.
4 Dimensions and mass
4.1 Dimensional characteristics
The circuit breakers do not have to correspond to the pictorial illustration, only the dimensions given shall be adhered to.
5.2.4 Resistance to vibrations
5.2.4.1 Combined test: ambient temperature at 70 °C and vibrations
Sinusoidal : 10 g. see EN 2794—001.
Random : 5,8 gn, see EN 2794—001.
Low frequencies :10 g, see EN 2794—001.
5.2.4.2 Combined test: ambient temperature at 85 °C, altitude and vibrations
Sinusoidal: 3 gn, see EN 2794-001.
5.2.5 Resistance to shocks
50 gn, see EN 2794001.
5.2.6 Mechanical endurance
See Table 6.
5.3 Environment characteristics
5.3.1 Humidity
See EN 2794-001.
5.3.2 Corrosion
See EN 2794-001.
5.3.3 Contaminating liquids
See EN 2794-001.
5.3.4 Overvoltage caused by lightning
See EN 2794-001.
5.4 Electrical characteristics
5.4.1 Nominal voltage of operational circuits
9 Marking
As defined on the drawing and unless otherwise specified by contract, marking shall include:
— the designation defined in Clause 6 on the packaging;
— the manufacture date (year, week): YYWW;
— the manufacturers name or trademark;
— the electrical diagram and the terminal identification;
— the pin terminal identification:
— the manufacturer’s part number (corresponding to the part number with connection and attachment hardware).
NOTE The marking could be combined on the both opposite faces. For electrical diagram and/or terminal kientification refer to the Figure 1.
10 Technical specification
See EN 2794-001.BS/EN 2794-004-2014 pdf download.