
9
Issue C
0
%
Germany (0 91 87) 10-0 - USA (847) 827-7600 - UK (01296) 420336 - www.etacbe.com
Protection degree IP 54 may apply to products with a splashcover, for
example for front of panel protection whereas the terminals (IP 00) will
be in an enclosed area.
Cable ratings to EN 60934
EN 60934:1994 + A1 : issue 1994
Standard current ratings as assigned to different cable cross sectional
areas (stranded copper cable).
Size mm
2
1
1.5
2.5
4
6
10
16
25
35
50
Current
rating (A)
>6
to 13 to 20
>13 >20 >25 >32 >50 >63
to 25
to 32
>80
to 100
>100
to 125
to 6
to 50
to 63
to 80
Protection against
access to hazardous
parts and against solid
foreign objects
Protection against ingress of water
Code letters and Second characteristic digit
first characteristic digit
0
1
2
3
4
5
6
IP 0
IP 00
IP 2
IP 20 IP 21 IP 22 IP 23
IP 3
IP 30 IP 31 IP 32 IP 33
IP 5
IP 54
IP6
IP 65 IP 66
Cable ratings and sizes for aerospace applications
Representation of operating status
Current AWG cable sizes
rating
EN 2350
(A)
MS 3320
Airbus
Boeing
BPS-C-144
0.5
1
2
2.5
3
4
5
7.5
10
15
20
25
20
20
18
18
18
18
18
16
16
14
12
10
22
22
22
22
22
22
22
22
20
18
16
24
24
24
24
24
24
24
22
20
16
14
12
20
18
18
18
18
18
16
16
14
12
10
AWG
mm
2
24
22
20
18
16
14
12
10
0.21
0.33
0.52
0.82
1.31
2.08
3.31
5.26
AWG =American
Wire
Gauge
In accordance with DIN 40719, part 3, issue April 1997, the operating
status of switching elements should be represented as follows:
G
Telecommunications
The representation of the
ready
status as used by the telecommuni-
cations industry - Fuses and circuit breakers are shown in the
closed
position.
G
Power engineering
The representation of the
open
position is used by the power, installation,
control and data processing industries.
Equipment is represented in the
de-energized
condition and without
the effect of an operating force.
Power switches, disconnectors, circuit breakers etc. are shown in the
open
condition, which is the
normal position
.
Following these definitions,
E-T-A products are generally shown in
the de-energized condition.
An Introduction to E-T-A Circuit Protection
Preferred degrees of protection
The definition of IEC Publication 50 (441), 1974 issue, applies.
A control or auxiliary contact which is closed
when the main contacts of the mechanical
switching device are closed and open when
they are open.
Example:
A control or auxiliary contact which is open
when the main contacts of the mechanical
switching device are closed and closed when
they are open.
Example:
Note:
The common terminal of change over contacts is often shown as C
(common).
Definition of make contact and break contact
make contact
a-contact
N/O (Si2) contact
break contact
b-contact
N/C (Si1) contact
Terminal identification
The following identifications are in conformance with DIN EN 5005 July
1977. However, the diagrams for the examples have been adjusted to
DIN 40900 1988 (equivalent to IEC 617 of 1983).
Main circuit
One-digit numerals - one pair of subsequent numerals per main
switching element
Example
Auxilairy circuits
Two-digit numbers - Second digit
function numeral
b-contact 1 and 2
a-contact 3 and 4
change over contact 1, 2 and 4
b-contact 7 and 8, delayed
change over contact
with special functions 5, 6 and 8
- First digit, ordinal number
switching elements with identical function
and belonging together
Examples:
b-contact a-contact change over contact
2
12
2 main switching elements
1
13
2
14
1
11
1
3
2
4
.1
.2
.3
.4
.4
.1
.2