RTRDU
Manual 5–step transformer with motor protection — a 3–phase transformer that controls the fan speed by altering the supply
voltage in five fixed steps. The steps are adjusted by using the control knob on the front of the unit.
N
L1
L2
L3
L3
N
L1
L2
PE
U
V
W
2
3
1
TB
TB
RT
L
L
N
230 V AC
RT
FS
FS
230 V AC
max. 1 A
A
B
M
3 ~
PE
V
W
U
TB
TB
Y/
0
1
5
4
2
3
0
1
5
4
2
3
C
B
D
E
G
F
RTRDU
0 1
A
A
A
A.
If the function is not necessary, the terminals must be bridged
B.
Contact rating, 230 V AC/maximum 1 A
C.
Time switch
D.
OFF/ON
E.
OFF/ON (only by reset)
F.
Mains supply, 3–phase 400 V 50/60 Hz
G.
3–phase motor with internal thermal contacts
19
