Ohmic Values
The range of ohmic values available is shown below. You may select any ohmic value between the Max & Min values.
Low Inductance Windings
Ayrton Perry windings are available for resistors which are required to be substantially non-inductive.
Thermal cut-outs
Cut-outs can be fitted to certain
resistors which will operate a contact to disconnect the resistor to
prevent overload damage.
Electrical Data Power Rating - Continuous Duty
The two power ratings given to each type of resistor in the table are based on temperature rises of 280°C
380°C respectively and relate to single resistors mounted in free air.
*380° applies only to vitreous resistors.
Where it is desirable to limit the surface temperature of the resistor refer to the graph below.
Standard Ohmic Values & Tolerances
for
vitreous enamelled resistors
(other values & tolerances are available on request)
WATTS
30
40
45
60
90
130
150
180
220
320
380
TOLERANCE
TYPE
Range
Ohmic Value
PE
FIXED WIRE
MIN
MAX
2R2
5K0
4R7
10K
4R7
10K
4R7
15K
10R
30K
10R
60K
12R
70K
22R
100K
22R
120K
33R
120K
47R
125K
OVER 10R =+/-5%
10R OR LESS +/-10%
PT
FIXED TAPE
MIN
MAX
0R02
2R0
0R15
4R5
0R2
4R5
0R2
4R5
0R3
9R0
0R7
9R0
0R8
10R
1R0
20R
1R0
20R
1R5
30R
1R5
30R
+/-10%
NI
NON INDUCTIVE
MIN
MAX
1R0
500R
2R0
500R
2R0
500R
3R0
500R
3R0
1K0
5R0
1K5
6R0
1K5
7R0
1K5
10R
1K5
25R
2K0
30R
2K5
+/-10%
ADJ
ADJUSTABLE
MIN
MAX
2R2
1K3
2R2
3K9
4R7
2K2
4R7
3K9
8R2
6K2
15R
11K
16R
13K
20R
16K
27R
22K
36R
22K
43R
22K
+/-10%
Ratings
for
vitreous enamelled resistors
De-Rating
Continuous Rating
Where it is desirable to limit the surface temperature of the resistor, refer to this graph.
Short Time
In cases where resistors are only required to be operated intermittently, a higher short-time rating may be
considered.
The graph shows loading against on time assuming a cooling time of at least 20 minutes between duty cycles.
Short
Time Ratings
for
vitreous enamelled resistors
TYPE
Size cm
Winding
Spaces cm
Con Rating Watts 280°
10 Sec. rating Watts
5
Sec. rating Watts
1 Sec. rating Watts
.5 Sec. rating Watts
Volts Max Vm
PE30
5.1
X 1.9
2.6
30
200
400
600
1300
360
PE40
10.2
X 1.9
7.7
40
300
600
900
1800
1080
PE45
5.1
X 3.2
2.6
45
400
800
1300
2600
360
PE60S
7.0
X 3.2
4.5
60
600
1200
1900
3800
630
PE60L
8.9
X 2.2
6.4
60
600
1200
1900
3800
890
PE90S
10.2
X 3.2
6.2
90
800
1600
2600
5200
860
PE90L
16.5
X 2.2
14
90
800
1600
2600
5200
1900
PE130
15.2
X 3.2
11.2
130
1000
2000
3300
6600
1500
PE150
17.8
X 3.2
13.8
150
1200
2400
3900
7900
1900
PE180
21.6
X 3.2
17.6
180
1500
3000
4950
9900
2400
PE220
26.7
X 3.2
22.7
220
2200
4400
7260
14500
3100
PE320
26.7
X 4.5
22.7
320
3500
7000
11550
23100
3100
PE380
30.5
X 4.5
26.5
380
6000
12000
19800
39600
3700
PE600
30.5
X 5.4
26.5
600
9400
18800
31000
62000
3700
PE750
35.6
X 5.4
31.6
750
11800
23600
38900
77800
4400
PT750
35.6
X 5.4
31.6
1000
15700
31400
52000
104000
4400
Operation in High Ambient Temperatures
When the ambient temperature is above 20°C resistors should be de-rated as shown on the graph below.
Dimensions (mm)for
vitreous enamelled resistors
TYPE
WATTS
WATTS
A
B
C
D
E
F
G
H
HR
J
K
L
M
N
P
R
280°C
380°C
PB & PE30
PT30
30
35
35
44
51
19
9.5
25
6.3
4
72
62
42
16
20
64
38
25
4x6
4x6
PB & PE40
PT40
40
50
65
80
102
19
9.5
25
6.3
4
123
113
93
16
20
114
38
25
4x6
4x6
PB & PE45
PT45
45
55
65
80
51
32
19
37
6.3
4
91
75
30
28
27
64
54
41
5x8
5x13
PB & PE60L
PT60L
60
75
75
90
89
22
12.6
30
6.3
4
117
103
77
20
27
102
45
32
4x6
5x8
PB & PE60S
PT60S
60
75
75
90
70
32
19
37
6.3
4
110
94
48
28
27
83
54
41
5x8
5x13
PB & PE90L
PT90L
90
110
125
185
165
22
12.6
30
6.3
4
193
179
153
20
27
178
45
32
4x6
5x8
PB & PE90S
PT90S
90
110
125
185
102
32
19
37
9.5
6
142
126
80
28
27
114
54
41
5x8
5x13
PB & PE130
PT130
130
160
175
215
152
32
19
37
9.5
6
192
176
130
28
27
165
54
41
5x8
5x13
PB & PE150
PT150
150
185
195
245
178
32
19
37
9.5
6
218
202
156
28
27
191
54
41
5x8
5x13
PB & PE180
PT180
180
220
230
285
216
32
19
37
9.5
6
256
240
194
28
27
229
54
41
5x8
5x13
PB & PE220
PT220
220
275
285
400
267
32
19
37
9.5
6
307
291
245
28
27
279
54
41
5x8
5x13
PB & PE320
PT320
320
400
420
560
267
45
28
43
9.5
6
318
291
248
44
51
-
-
-
-
7x14
PB & PE380
PT380
380
476
500
625
305
45
28
43
9.5
6
356
327
286
44
51
-
-
-
-
7x14
PT Resistors. Dimensions 'B' may vary up to 10mm greater depending on the resistance value specified
