32
Ohmite Mfg. Co.
1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Ohmite Mfg. Co.
STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES
270 Series
Vitreous Enamel Power Resistors
L
DC
=
=
Stock values
=
Non-stock values subject to minimum handling charge per item
Dimensions (in. /
mm
)
L
D
C
Series
Wattage
Ohms
Length
Diam.
I. D. Core
Voltage
L12
12
0.1-51K
0.1-51K
1.75 /
1.75 /
44.4
0.313 /
0.313 /
7.94
7.94
7.94 7.94
0.188 /
0.188 /
4.76
4.76
4.76 4.76
565
565
L25
25
0.15-100K
2.0 /
50.8
0.562 /
14.3
14.3 14.3
0.313 /
7.94
625
L50
L50
50
50
0.38-260K
0.38-260K
4.0 /
4.0 /
101.6
101.6
0.562 /
0.562 /
14.3
14.3
14.3 14.3
0.313 /
0.313 /
7.94
7.94
1625
1625
L100
100
0.23-101K
6.5 /
165.1
0.750 /
19.1
0.50 /
12.7
12.7 12.7
2845
L175
L175
175
175
0.13-101K
0.13-101K
8.5 /
8.5 /
215.9
215.9
1.125 /
1.125 /
28.6
28.6
28.6 28.6
0.75 /
0.75 /
19.1
19.1
3595
3595
L225
225
0.16-129K
10.5 /
266.7
1.125 /
28.6
28.6 28.6
0.75 /
19.1
4595
L500
L500
500
500
0.38-218K
0.38-218K
12.0 /
12.0 /
304.8
304.8
2.50 /
2.50 /
63.5
63.5
63.5 63.5
1.75 /
1.75 /
44.5
44.5
44.5 44.5
4970
4970
L1000
1000
0.69-392K
20.0 /
508.0
2.50 /
63.5
63.5 63.5
1.75 /
44.5
44.5 44.5
8900
Shaded values involve very fine resistance wire and should not be used in critical
applications without burn-in and/or thermal cycling.
Red outlined values supplied in Silicone-Ceramic coatings instead of vitreous enamel.
Non-Inductive versions available.
Other sizes available. Consult factory.
Also available in low cost Centohm coating. Consult Factory.
0.51
L12JKR51
1
L12J1R0
1.5
L12J1R5
2.2
L12J2R2
3.3
L12J3R3
4.7
L12J4R7
6.8
L12J6R8
10
L12J10R
12
L12J12R
15
L12J15R
18
L12J18R
22
L12J22R
27
L12J27R
33
L12J33R
39
L12J39R
47
L12J47R
56
L12J56R
68
L12J68R
82
L12J82R
100
L12J100
120
L12J120
150
L12J150
180
L12J180
220
L12J220
270
L12J270
330
L12J330
390
L12J390
1
–––
1R0
2
–––
2R0
3
–––
3R0
4
–––
4R0
5
–––
5R0
10
–––
10R
15
–––
15R
25
–––
25R
50
–––
50R
75
–––
75R
100
–––
100
125
–––
125
150
–––
150
200
–––
200
250
–––
250
500
–––
500
750
–––
750
800
–––
800
1,000
–––
1K0
1,500
–––
1K5
2,000
–––
2K0
2,500
–––
2K5
3,000
–––
3K0
3,500
–––
3K5
470
L12J470
560
L12J560
680
L12J680
820
L12J820
1000
L12J1K0
1200
L12J1K2
1500
L12J1K5
1800
L12J1K8
2200
L12J2K2
2700
L12J2K7
3300
L12J3K3
3900
L12J3K9
4700
L12J4K7
5600
L12J5K6
6800
L12J6K8
8200
L12J8K2
10000
L12J10K
12000
L12J12K
15000
L12J15K
18000
L12J18K
22000
L12J22K
27000
L12J27K
33000
L12J33K
39000
L12J39K
47000
L12J47K
51000
L12J51K
4,000
–––
4K0
5,000
–––
5K0
6,000
–––
6K0
7,500
–––
7K5
8,000
–––
8K0
10,000
–––
10K
12,000
–––
12K
15,000
–––
15K
20,000
–––
20K
25,000
–––
25K
30,000
–––
30K
35,000
–––
35K
40,000
–––
40K
50,000
–––
50K
60,000
–––
60K
70,000
–––
70K
75,000
–––
75K
80,000
–––
80K
100,000
–––
100K
125,000
–––
125K
150,000
–––
150K
175,000
–––
175K
200,000
–––
200K
250,000
–––
250K
Ohmic
value
12 Watt
Ohmic
value
12 Watt
Ohmic value
L25J
–––
25
L50J
–––
50
L100J
–––
100
L175J
–––
175
Wattage
Part No.
Prefix
Suffix
L225J
–––
225
L500J
–––
500
L1000J
–––
1000
Ohmic value
L25J
–––
25
L50J
–––
50
L100J
–––
100
L175J
–––
175
Wattage
Part No.
Prefix
Suffix
L225J
–––
225
L500J
–––
500
L1000J
–––
1000
Select 270 Type fixed resistors
for applications requiring watt-
age ratings from 12 to 1000
watts.
The 270 Type resistors are
equipped with lug terminals
suitable for soldering or sturdy
bolt connection. When secure
mounting is required, the hol-
low core of these resistors
permit fastening with spring-
type brackets, thru bolts or
thru bolts with slotted-steel
brackets.
Suitable for rugged applica-
tions, the 270 Type resistors
feature all-welded construction
and durable lead free vitreous
enamel coating.
Mounting brackets not
included with resistors.
FEATURES
•
Terminals suitable for soldering
or bolt connection.
•
High wattage applications.
•
Rugged lead free vitreous enam-
el coating.
•
Flame resistant coating.
•
All-welded construction.
•
RoHS compliant product avail-
able Jan. 2006 Add “E” suffix to
part number to specify.
Power limitations for high
resistance values:
When resis-
tance exceeds the resistance
values listed at right, derate the
Power Rating by 25% to improve
reliability:
Power
Resistance
rating
value
12W
3,900
Ω
25W
12,000
Ω
50W
35,000
Ω
100W
75,000
Ω
No power derating necessary for
ratings higher than 100 watts.
SPECIFICATIONS
Material
Coating:
Lead free vitreous
enamel.
Core:
Tubular ceramic.
Terminals:
Solder coated radial
lug.
Derating:
Linearly from 100% @
+25°C to 0% @ +350°C.
Electrical
Tolerance:
±5% 1
Ω
and over (J)
±10% under 1
Ω
(K)
Power rating:
Based on 25°C free
air rating.
Overload:
10 times rated wattage
for 5 seconds.
Temperature coefficient:
1 to 20
Ω
: ±400 ppm/°C.
Above 20
Ω
: ±260 ppm/°C
Dielectric withstanding voltage:
1000 VAC: 12 to 100 watt rating.
3000 VAC: 175 to 225 watt rat-
ing (Measured from terminal to
mounting bracket)
To calculate max. amps:
use the
formula
√
P/R
To calculate max. amps:
√
See page 34
for mounting hardware