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BETA Protecting
Residual Current Protective Devices
SIQUENCE 5SM3, 5SU1 universal
current-sensitive type B
2/9
Siemens ET B1 · 10/2008
2
*
You can order this quantity or a multiple thereof.
■
Overview
Frequency converters, medical devices and UPS systems are
seeing increasing use in industry. Smooth DC residual currents
or currents with low residual ripple may occur in the event of
faults on these devices.
Type A residual current protective devices are unable to detect
these smooth DC residual currents. Furthermore, such smooth DC
residual currents make Type A devices increasingly insensitive to
AC residual currents and pulsating DC residual currents. If a
fault occurs, there is therefore no tripping and the desired
protective function is no longer assured.
Universal current-sensitive residual current protective devices of
Type B have an additional transformer, which is supplied with a
control signal. It is therefore possible to evaluate the change of the
transformer's operating range caused by smooth DC residual
currents, thus ensuring the desired protective function.
The devices in this series are designed as residual current operated
circuit breakers (RCCBs) up to 80 A and as residual current
circuit breakers with integral overcurrent protection (RCBOs) for
100
A or 125 A in Characteristics C or D.
■
Benefits
•
Universal current-sensitive residual current protective devices
detect not only AC residual currents and pulsating DC residual
currents, but also smooth DC residual currents, thus ensuring
the desired protective function with all types of residual current
•
The tripping characteristic is adapted to the increase of leakage
currents at higher frequencies in systems with capacitive
impedances and results in increased operating safety.
•
The RCBO is a compact device for up to 125 A. It provides not
only personnel, property and fire protection but also overload
and short-circuit protection for cables. This enables great
savings on wiring and installation costs.
■
Technical specifications
I
2
t characteristic curves, see page 2/28.
RCCBs
RCBO
5
SM3
5
SU1
Standards
IEC/EN 61008-1 (VDE 0664-10);
VDE 0664-100;
IEC/EN 61543 (VDE 0664-30);
IEC 62423
IEC/EN 61009-1
(
VDE 0664-20);
VDE 0664-200;
IEC/EN 61543
(
VDE 0664-30);
IEC 62423
Versions
1
P+N
3
P+N
4
P
Tripping characteristic
--
--
C, D
Surge current withstand capability with
current waveform 8/20 μs acc. to
DIN VDE 0432-2
•
Super resistant
kA
> 3
> 3
> 3
•
Selective
kA
--
> 5
> 5
Minimum operational voltage for
test function operation
V AC
150
150
150
Rated voltages
U
n
V AC
230
400
400, 480
Rated frequency
Hz
50 ... 60
Rated currents
I
n
A
16, 25, 40, 63
25, 40, 63, 80
100, 125
Rated residual currents
I
n
mA
30, 300, 500
Rated switching capacity
•
I
m
A
800
--
•
I
cn
kA
--
10
Conductor cross-sections
•
Solid and stranded
mm
2
1.5 ... 25
6 ... 50
•
Finely stranded, with end sleeve
mm
2
1.5 ... 16
6 ... 35
Terminal tightening torques for all devices
Nm
2.5 ... 3.0
3.0 ... 3.5
Mains connection
Either top or bottom
Mounting position
Any
Degree of protection acc. to EN 60529
(
VDE 0470-1)
IP20
Touch protection acc. to EN 50274
(
VDE 0660-514)
Finger and back-of-hand safe
Service life, electrical and mechanical;
(
test cycle acc. to regulations)
> 10 000 switching cycles
Storage temperature
°C
-40 ...
+75
Ambient temperature
°C
-25 ...
+45,
Marked with
Resistance to climate acc. to
IEC 60068-2-30
28
cycles (55 °C; 95 % rel. humidity)
CFC and silicone-free
Yes
-25
-25
(
Type B)
© Siemens AG 2008