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BETA Switching
Transformers, Bells and Socket Outlets
4
AC3 0, 4AC3 1 bell transformers
10/3
Siemens ET B1 · 10/2008
10
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Overview
A typical application for these bell transformers is short-time
use, i.e. bells, gongs, door openers or remote control switches
in residential buildings.
The standard EN 61558 distinguishes between transformers for
short-time loading and those for permanent loading. This means
that clear requirements for bell transformers are defined. A bell
transformer must maintain 100 % of its rated power for 1 minutes
or 20 % for 5 minutes, without shutting down.
Siemens bell transformers are protected against short circuit or
moderate overload by a PTC resistor. If a disconnection occurs,
the bell transformer must be switched off for approx. 30 minutes
to cool down the PTC resistor.
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Benefits
•
Bell transformers with a footprint of only one modular width
•
Reliable device protection through PTC resistors; for protection
against overload and short circuits
•
The bell transformers are IMQ (Italy) and VDE approved. This
guarantees safety during applications.
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Technical specifications
4
AC3 006 4AC3 008 4AC3 016 4AC3 108 4AC3 116 4AC3 140
Standards
EN 61558-2-8
Approved acc. to
EN 61558-2, IMQ
Rated operational power P
s
VA 8
8
16
8
16
40
Rated operational voltage U
e
V AC 230
Operating range
at 50/60 Hz
× U
e
0.9 ... 1.06
Rated frequency
Hz 50
Operating frequency range
Hz 45 ... 65
48 ... 62
Rated secondary voltage U
sec
V AC 12
2
× 4
2
× 12
•
In series connection
V AC --
8
24
Rated secondary current
I
sec
•
At 4 V
A AC --
2
× 1.0
2
× 2.0
--
--
--
•
At 8 V
A AC --
1
1
--
--
--
•
At 12 V
A AC 0.67
--
--
2
× 0.33
2
× 0.67
2
× 1.67
•
At 24 V
--
--
--
0.33
0.67
1.67
Rated power dissipation P
V
•
In no-load operation
W 0.78
1.8
2.4
1.6
1.6
1.2
•
At rated load
W 1.65
5
7.5
3.6
8.2
17.2
Safe isolation
•
Creepage distances and clearances
mm > 3
Insulation class
B
Test voltage,
50
Hz, 1 minute
•
Primary against secondary winding
kV 4
> 3.75
Terminals
± screw (Pozidriv)
1
Conductor cross-sections
•
Rigid
mm
2
1
× 6 or 2 × 4
•
Flexible, with end sleeve
mm
2
0.75
Permissible ambient temperature
°C -10 .... +25
Permissible humidity
% 80
Degree of protection
Acc. to EN 60629
IP20
Safety class
Acc. to EN 61140/
VDE 0140-1
II
© Siemens AG 2008