CONTACTORS TYPE NF, NFS AND NHF
CONTACTORS FOR MEDIUM FREQUENCY UP TO
10000Hz, 1500 V
These contactors, specially
designed for the use in the control of induction furnaces, are constructed in three
versions with different characteristics suitable for the different frequencies of
utilization.
a) Contactors type NF for frequencies up to 250Hz:
They are directly derived from the standard bar-contactors of the N series and constructed
with care to avoid dangerous overheating and to withstand high voltage;
b) Contactors type NFS for frequency from 250 to 500
Hz:
These are derived from the NF series by the fitting of laminated magnetic blowing circuits
and the use of non-magnetic metals for all the parts subject to the circulation of induced
eddy current (fixed and movable axles, bolts, etc.);
c) Contactors type NHF for frequency over 500Hz up to
10KHz:
These are special contactors particularly designed, in which all the metallic parts
subject to any induced current are made of non-magnetic materials. Moreover they are
fitted with a separate arcing-pole connected in parallel with the main pole which is then
without a magnetic blow out circuit.
Utilization category up to
125Hz and up to 500Hz
Type Nf & NFS |
SIZE
(Ith@50Hz) |
Poles
N° |
Nom.
Volt.
[V] |
Rated Operational Current
[A] |
| Type NF
|
Type NFS
|
| 100Hz |
150Hz |
250Hz |
250Hz |
350Hz |
500Hz |
| 85 |
1 |
2
|
600 |
1200 |
27 |
25 |
23 |
25 |
18 |
16 |
| 125 |
1 |
2 |
600 |
1200
|
75 |
70 |
60 |
70 |
50 |
45 |
| 190 |
1 |
2 |
600 |
1200
|
115 |
105 |
95 |
105 |
75 |
65 |
| 270 |
1 |
2 |
600 |
1200
|
160 |
150 |
135 |
150 |
110 |
95 |
| 350 |
1 |
2 |
600 |
1200
|
210 |
190 |
175 |
190 |
140 |
120 |
| 550 |
1 |
2 |
600 |
1200
|
330 |
300 |
275 |
300 |
220 |
195 |
| 650 |
1 |
2 |
600 |
1200
|
390 |
360 |
325 |
360 |
260 |
230 |
| 800 |
1 |
2 |
600 |
1200
|
480 |
440 |
400 |
440 |
320 |
280 |
| 1000 |
1 |
2 |
600 |
1200
|
600 |
550' |
500 |
550 |
400 |
350 |
| 1250 |
1 |
2 |
600 |
1200
|
750 |
700 |
600 |
700 |
500 |
450 |
Utilization category up to
500Hz and up to 10.000Hz
Type NHF |
Utilization frequency
[KHz] |
|
1 |
2 |
4 |
6 |
8 |
10 |
Rated Voltage
[V] |
1P |
750 |
750
|
600 |
500
|
400 |
300 |
| 2P |
1500 |
1500 |
1000 |
850 |
700 |
600 |
| TYPE |
Rated Operational Current [A] |
| NHF
270 |
|
250 |
220 |
200 |
180 |
150 |
130 |
| NHF
350 |
300 |
270
|
240 |
210
|
180 |
170 |
| NHF
550 |
500 |
450 |
400 |
350 |
300 |
270 |
| NHF
650 |
600 |
540
|
480
|
420
|
360 |
320 |
| NHF
1000 |
900 |
800 |
720 |
630 |
540 |
500 |
| NHF 1200 |
1100 |
1000 |
900 |
750 |
650 |
600 |
General Characteristics | Electrical Characteristics | Overall Dimensions | Contactors type TAN | Contactors type TDN | Contactors type
TADN | Contactors type CN
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