BS EN 4838-005 pdf free download

BS EN 4838-005 pdf free download. 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.
1 Scope This document specifies the required characteristics for single-pole, arc fault circuit breakers rated currents from 3 A to 25 A, switching capacity 65 I n , 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 circuit breaker 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. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3155-016, Aerospace series — Electrical contacts used in elements of connection — Part 016: Contacts, electrical, male, type A, crimp, class S — Product standard EN 3841-100, Aerospace series — Circuit breakers — Test Methods — Part 100: General EN 4838-001, Aerospace series — Arc Fault Circuit breakers, single-pole, temperature compensated, rated current 3 A to 25 A —115 Vac 400 Hz constant frequency — Part 001: Technical specification EN 6113, Aerospace series — Circuit breakers, connecting and attachment hardware TR 6083, Aerospace series — Cut-outs for installation of electrical components 1) MIL-S-19500B, Semiconductor Device, Diode, Type 1N969 (Navy) 2) MIL-I-81969/1, Installing and removal tools, connector electrical contact, Type III, Class 2, composition C 2) MIL-I-81969/14, Installing and removal tools, connector electrical contact, Type III, Class 2, composition B 2) FED-STD-595B, Colors used in Government Procurement 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 Dimension 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. See Figure 1. Dimensions are in millimetres with exception Terminal thread 8-32 UNC. NOTE Tools noted in 5.2.4 shall be applied without interfering with the terminal 2 connection. Even if the circuit  breakers are grouped. 4.2 Electrical diagram See Figure 2. Push button released: CB is open, signal contact is closed. Push button pressed: CB is closed, signal contact is open. 4.3 Mass Maximum mass: 35 g (including hardware delivery code A). 4.4 Panel mounting Panel cut-out : The panel cut-out is in accordance with the designation TR 6083C202. Spacing : 20 mm horizontal and 35 mm vertical from the centre of the mounting holes. Panel thickness : 1 mm to 3 mm. The metallic front plate of the breaker (mark 15 on Figure 1) is an electrical connection to neutral. For this purpose the panel mounting means must ensure a good electrical continuity to neutral. In case of panel isolated from neutral a rear wire can be used to connect neutral to terminal 6 (see Figure 1).5 Characteristics 5.1 Material, surface treatment See EN 4838-001. 5.2 Mechanical characteristics 5.2.1 Fasteners See EN 6113. 5.2.2 Recommended tightening torque of attaching nut for installation (4,0 ± 0,25) N.m 5.2.3 Recommended tightening torque of connection hardware for installation (1,6 ± 0,1) N.m 5.2.4 Recommended tools for contacts of auxiliary contact insertion and extraction  plastic SAE-81969/14,  metallic SAE-81969/1. 5.2.5 Resistance to vibrations 5.2.5.1 Combined test: ambient temperature at 70 °C and vibrations Sinusoidal: 10 g-PK, see EN 4838-001. Random: 5,8 Grms, see EN 4838-001. Low frequencies: 10 g-PK, see EN 4838-001.BS EN 4838-005 pdf download.