30
MIETZSCH GmbH Lufttechnik Dresden
Großenhainer Str. 137
01129 Dresden
Fax (0351) 8 58 00 74
http://www.mietzsch.de
Radial fans of plastic material
Electrical accessories
Repair switch RS
The repair switch RS is used to disconnect the fan completely from the mains in
cases of repair and maintenance. This excludes the risk of accidents arising from
unauthorized activation. The switch is supplied as a separate unit or fastened and
wired on the fan.
The switch size is determined by the motor power and mains voltage.
Fan connection through a frequency inverter requires the cable connection to be
shielded.
Six-pole switches are used for pole-changing motors. Explosion-proof motors are
equipped with switches with explosion protection EEX de IICT6 according to ATEX.
Motor protection switch MS
Every motor has to be connected to the supply system
through a protective device with reclosing blocking.
Protective switches of type MS are three-pole low voltage
switching appliances used for single-phase and three-
phase motors. They protect the motor from impermissible
overload and are used simultaneously for fan activation
and deactivation in normal operation.
The switch is supplied as a separate unit or fastened and
wired on the fan.
It has to be set according to the particular nominal motor
current.
Pole-changing motors require a switch for every speed rate. Explosion-proof motors are equipped with switches with
explosion protection EEX de IICT6 according to ATEX.
Frequency inverter FU 0.18 ... 15.0-A31
The inverter FU ... A31 permits many simple control and regulation problems to be solved in a very convenient way if its
numerous functions are utilized and some additional components added.
On this basis MIETZSCH supply individual applications such as speed setting by means of integrated potentiometer,
stepped regime, time-control activation, pressure or volume flow control and many others. The user gets a complete system
(fan, inverter, switches, signal lamps, measuring appliances, sensors etc.) which is immediately ready for operation when
the electrical connections have been made. All necessary setting and programming work is done by the manufacturers.
Example:
Volume flow control with alarming if rated value is fallen below
alarm device
fan
measuring orifice
with pressure transmitter
FU ... A31
with master switch
rated value potentiometer
degree of protection IP 55
Type
Currant range / A
MS 1.0
0,6 ... 1,0
MS 1.6
1,0 ... 1,6
Motor protection switch
MS 2.5
1,6 ... 2,5
three-pole
MS 4.0
2,5 ... 4,0
(for single-phase and
MS 6.3
4,0 ... 6,3
three-phase motors)
MS 10.0
6,3 ... 10
degree of protection IP 54
MS 16.0
10 ... 16
MS 20.0
16 ... 20
MS 25.0
20 ... 25
MS 32.0
25 ... 32
MS 40.0
32 ... 40
Repair switch
Switching capacity / kW
three-pole
Type
3(1)x230V
3x400V
3x500V
(for single-phase and
RS 20 A / HS
3,5
6,5
7,5
three-phase motors) RS 25 A / HS
7
13
11
with auxiliary contact
RS 32 A / HS
8,5
15
18,5
key-locked
RS 63 A / HS
18,5
37
37
degree of protection IP 65
RS 100 A / HS
30
50
65
i_v
re_
en
(
09/
06
)
