CWF, BWF, RWF
7.4
3-phase “universal” wiring
Fuses F1 are always present in this wiring design.
Fuses F2 could be absent in some circumstances, if the circuit does not exceed 10A.
Fuses F3 are present if the circuit exceeds 25A, but otherwise are usually absent.
7.5
Supply light &
Instrument Switch
coil
temperature
controller
overtemp.
controller
thermocouple
safety
switch
SSR
heat
on
F3
F1
F2
F3
SSR
SSR
F3
heat
on
F3
e
l
e
m
e
n
t
(s)
heat
on
F3
F3
if fitted
Contactors
(2 or 3)
Filters
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
N
L
L
N
L
N
thermocouple
Fuses or
EMC filters
Supply
Terminals
Circuit no. 3
Circuit no. 2
N
L
N
L
N
L3
L2
L1
N
PE
L
Circuit no. 1
3-phase + neutral
A model made to this diagram can be
converted by the customer between the
following supply voltages:
between
3-phase + neutral in the range
380/220V – 415/240V
and
3-phase delta in the range
220V – 240V
and
single phase in the range
220V – 240V
208V model: convertable from 208V delta
to 208V 1-phase
coil
3-phase delta
Supply
Terminals
Fuses or
EMC filters
N
L
N
L
N
L3
L2
L1
N
L
PE
Supply
Terminals
N
L
N
L
N
L3
L2
L1
N
PE
L
1-phase
Circuit no. 1
Circuit no. 2
Not
used
Circuit no. 3
Fuses or
EMC filters
Circuit no. 1
Not
used
Circuit no. 2
Circuit no. 3
MF02
13
