2000 Oct 20
2
BCcomponents
Product specification
Cemented wirewound resistors AC01/03/04/05/07/10/15/20
FEATURES
• High power dissipation in
small volume
• High pulse load handling
capabilities.
APPLICATIONS
• Ballast switching
• Shunt in small electric motors
• Power supplies.
DESCRIPTION
The resistor element is a resistive wire
which is wound in a single layer on a
ceramic rod. Metal caps are pressed
over the ends of the rod.
The ends of the resistance wire and the
leads are connected to the caps by
welding. Tinned copper-clad iron
leads with poor heat conductivity are
employed permitting the use of
relatively short leads to obtain stable
mounting without overheating the
solder joint.
The resistor is coated with a green
silicon cement which is not resistant to
aggressive fluxes. The coating is
non-flammable, will not drip even at
high overloads and is resistant to most
commonly used cleaning solvents, in
accordance with “MIL-STD-202E,
method 215” and “IEC 60068-2-45”.
QUICK REFERENCE DATA
DESCRIPTION
VALUE
AC01
AC03
AC04
AC05
AC07
AC10
AC15
AC20
Resistance range
0.1
Ω=
to
2.4 k
Ω=
0.1
Ω
to
5.1 k
Ω
0.1
Ω
to
6.8 k
Ω
0.1
Ω
to
10 k
Ω
0.1
Ω
to
15 k
Ω
0.68
Ω
to
27 k
Ω
0.82
Ω
to
39 k
Ω
1.2
Ω
to
56 k
Ω
Resistance tolerance
±5%; E24 series
Maximum permissible body temperature
350
°C
Rated dissipation at Tamb =40 °C
1 W3 W4 W5 W
7 W
10 W
15 W
20 W
Rated dissipation at Tamb =70 °C
0.9 W
2.5 W
3.5 W
4.7 W
5.8 W
8.4 W
12.5 W
16 W
Climatic category (IEC 60 068)
40/200/56
Basic specification
IEC 60115-1
Stability after:
load, 1000 hours
∆R/R max.: ±5% + 0.1 Ω
climatic tests
∆R/R max.: ±1% + 0.05 Ω
short time overload
∆R/R max.: ±2% + 0.1 Ω