RES-PFE-PFR Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Clamps, movable along resistor

PFE and PFR Series
Powr-Rib® Edgewound
Edgewound and Round Wire
Designed in both Edgewound and Round
Wire formats, these rugged resistors can
handle 700 to 1000 Watts of power.
Specify our Edgewound design for
very low resistance and high power
capacity. When higher resistance with lower power
capacity is required use our Round Wire design.
These resistors are constructed of a heavy resistance alloy mounted on
ceramic insulators and supported by a metal mounting bracket. Metal parts,
except for the resistance element, are heavily plated to prevent oxidation at high
operating temperatures and to prevent corrosion. The mounting bar is slotted
on each end to facilitate installation. Edgewound units provide clamp-type ter-
minals, permitting a reliable connection which can be moved along the resistive
element to obtain intermediate values.
c h a r a c t er i s t i c s
Current Rating Continuous duty as listed on follow-
ing page.
Wattage Rating 700 to 1,000 (up to 1,600 watts on
special order)
Resistance ±10% standard, ±5% available
Tolerance
Terminals
Clamps, movable along resistor
wire for setting intermediate resis-
tance values on Edgewound units
(current must be derated in propor-
tion).
Temperature ±300 ppm/°C for resistors 50 amps
Coefficient and more; ±500 ppm/°C for resis-
tors 47 amps or less
Ohmic Values See chart on following page
Mounting Metal mounting bar is slotted on
each end to facilitate installation.
Short Term 10x rated wattage for five seconds
Overload
Derating
100
80
60
40
20
0
0 25 50 100 150 200 250 300 350
Ambient Temperature, °C
Size* (No. of
Insulator-Sections Long)
Dimension A
in.
mm
Dimension B
in.
mm
2
3
4
5 (std.)
6
7
8
8.875 11.875 14.875 17.875 20.875 23.875 26.875
(225.43) (301.63) (377.83) (454.03) (530.23) (606.43) (682.63)
7.250 10.250 13.250 16.250 19.250 22.250 25.250
(184.15) (260.35) (336.55) (412.75) (488.95) (565.15) (641.35)
Max. Amps Ohms Ohms Ohms Ohms Ohms Ohms Ohms
PFE Edgewound
100 0.033 0.057 0.080 0.100 0.120 0.140 0.160
91
0.040 0.070 0.100 0.120 0.140 0.160 0.180
89
0.046 0.078 0.110 0.140 0.170 0.200 0.230
78
0.052 0.088 0.120 0.160 0.190 0.220 0.250
75
0.060 0.100 0.140 0.180 0.210 0.250 0.300
68
0.070 0.120 0.180 0.220 0.260 0.300 0.340
63
0.080 0.130 0.190 0.250 0.300 0.350 0.400
57
0.100 0.160 0.230 0.300 0.360 0.420 0.480
54
0.110 0.180 0.250 0.330 0.400 0.470 0.540
50 0.120 0.200 0.280 0.370 0.450 0.530 0.610
47 0.170 0.280 0.380 0.500 0.600 0.700 0.800
43 0.210 0.330 0.460 0.600 0.720 0.850 0.980
41 0.230 0.360 0.510 0.670 0.800 0.930 1.06
39 0.260 0.420 0.580 0.750 0.900 1.05 1.20
33
0.350 0.560 0.770 1.00
1.20
1.40
1.60
29
0.450 0.730 1.00
1.30
1.50
1.75
2.00
26
0.560 0.900 1.20
1.60
1.90
2.20
2.50
18.4 0.690 1.20
1.70
2.20
2.70
3.10
3.50
16.3 0.880 1.50
2.20
2.80
3.40
4.00
4.60
14.6
1.10
1.90
2.70
3.50
4.30
5.10
5.90
12.7 1.40
2.40
3.50
4.50
5.50
6.50
7.50
11.8
1.70
2.90
4.20
5.40
6.60
7.80
9.00
10.3 2.10
3.70
5.30
6.80
8.30
9.80
11.3
9.4
2.70
4.60
6.50
8.50 10.40 12.3
14.2
PFR Round-Wire
8.3
3.4
5.9
8.5
11.0
13.5
16.0
18.5
7.6
4.1
7.1
10.0
13.0
15.9
18.8
21.7
6.6
5.3
9.2
13.0
17.0
20.8
24.6
28.4
5.9
6.3
10.9
15.4
20.0
24.5
29.0
33.5
5.1
7.9
13.6
19.3
25.0
30.7
36.4
42.1
*Standard 5-section units are stocked; part numbers are listed on the following page.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
105
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