270 Series
D
L
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. Add “E” suffix to part num-
ber to specify.
Core
Code
D
K
K
M
P
P
S
S
Standard
Terminal
57
40
40
40
46
46
45
45
SPECiFiCaTiOnS
Material
Coating:
Lead free vitreous
enamel. Very large models (750
watts and up) are supplied in
Silicone Ceramic. Also available
in low-cost Centohm coating;
Consult factory.
Core:
Tubular ceramic.
Terminals:
Solder coated radial
lug. RoHS solder composition is
96% Sn, 3.5% Ag, 0.5% Cu
Derating:
Linearly from 100% @
+25°C to 0% @ +350°C.
Electrical
Tolerance:
±5% 1Ω and over (J)
±10% under 1Ω (K)
Power rating:
Based on 25°C free
air rating.
Overload:
10 times rated wattage
for 5 seconds.
Temperature coefficient:
1 to 20Ω: ±400 ppm/°C.
Above 20Ω: ±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
Power limitations for high resis-
tance values:
When resistance
exceeds the resistance values
listed, derate the Power Rating by
25% to improve reliability:
Power Resistance
No power
derating
rating
value
necessary
12W
3,900Ω
for ratings
25W
12,000Ω
higher than
50W
35,000Ω
100W.
100W
75,000Ω
Vitreous Enamel Power
C
See page 36
for mounting
hardware
Series
L12
L25
L50
L100
L175
L225
L500
L1000
Wattage
12
25
50
100
175
225
500
1000
Ohms
0.1-51K
0.15-100K
0.38-260K
0.23-101K
0.13-101K
0.16-129K
0.38-218K
0.69-392K
Dimensions (in. /
mm)
L
D
C
1.75 / 44.4
0.313 / 7.94
0.188 / 4.76
2.0 / 50.8
0.562 / 14.3
0.313 / 7.94
4.0 / 101.6
0.562 / 14.3
0.313 / 7.94
6.5 / 165.1
0.750 / 19.1
0.50 / 12.7
8.5 / 215.9
1.125 / 28.6
0.75 / 19.1
10.5 / 266.7
1.125 / 28.6
0.75 / 19.1
12.0 / 304.8
2.50 / 63.5
1.75 / 44.5
20.0 / 508.0
2.50 / 63.5
1.75 / 44.5
Voltage
565
625
1625
2845
3595
4595
4970
8900
Non-Inductive versions available; Other sizes available; Also available in low cost Centohm or Silicone coating; Consult Ohmite.
* Maximum Voltage is based on Ohm’s Law [V=√P*R] as limited by the resistance value of specified product
Select 270 Type fixed resistors for applications requiring wattage ratings from 12 to 1000 watts.
The 270 Type resistors are equipped with lug terminals suitable for soldering or sturdy bolt con-
nection. When secure mounting is required, the hollow core of these resistors permit fastening with
spring-type brackets, thru bolts or thru bolts with slotted-steel brackets.
Suitable for rugged applications, the 270 Type resistors feature all-welded construction and
durable lead free vitreous enamel coating. Mounting brackets not included with resistors.
ordering info
Series
Non-inductive
Blank = Standard
N = Non-inductive
RoHS Compliant
made-to-order partS
Non-inductive
Blank = Standard
N = Non-inductive
Core Diameter
See “Core and
Terminal Selection”
RoHS Compliant
�½ �½�½�½�½ �½ �½ �½ �½ �½ �½
Coating
Wattage Tolerance Ohms
Blank = Vitreous
J = 5%
1R0 = 1
Ω
C = Centohm
K = 10% 250 = 250
Ω
S = Silicone
1K0 = 1,000
Ω
25K = 25,000
Ω
25K5 = 25,500
Ω
�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½�½
Coating
Wattage
270 = Vitreous
470 = Silicone Ceramic
Terminal Type
See “Resistor Terminals
for Tubular Cores”
Ohms
Tolerance
R500 = 0.500
Ω
J = 5%
1R00 = 1
Ω
K = 10%
250R = 250
Ω
See website for
1K00 = 1,000
Ω
25K0 = 25,000
Ω
custom core and
25K5 = 25,500
Ω
terminal info
S ta n d a r d pa rt n u m b e r S f o r 2 7 0 S e r i e S
L1000J–––1000
Ohmic
value
0.51
1
3.3
4.7
10
12
15
22
27
33
47
68
82
100
150
12 Watt
L12JKR51E
L12J1R0E
L12J3R3E
L12J4R7E
L12J10RE
L12J12RE
L12J15RE
L12J22RE
L12J27RE
L12J33RE
L12J47RE
L12J68RE
L12J82RE
L12J100E
L12J150E
Ohmic
value
180
270
330
390
470
560
1000
1200
1500
2200
2700
4700
10000
18000
22000
51000
L100J–––
100
L175J–––
175
L100J–––
100
12 Watt
L12J180E
L12J270E
L12J330E
L12J390E
L12J470E
L12J560E
L12J1K0E
L12J1K2E
L12J1K5E
L12J2K2E
L12J2K7E
L12J4K7E
L12J10KE
L12J18KE
L12J22KE
L12J51KE
Ohmic value
Ohmic value
L175J–––
175
L25J–––
25
L50J–––
50
L25J–––
25
L50J–––
50
L1000J–––1000
Wattage
L225J–––
225
L500J–––
500
Wattage
L225J–––
225
L500J–––
500
= Standard values; check availability using the worldwide
inventory search at www.ohmite.com
Red outlined values supplied in Silicone-Ceramic coatings
instead of vitreous enamel.
1
2
3
4
5
10
15
25
50
75
100
125
150
200
250
500
750
800
1,000
1,500
2,000
Part no.
Prefix
Suffix
–––1R0E
–––2R0E
–––3R0E
–––4R0E
–––5R0E
–––10RE
–––15RE
–––25RE
–––50RE
–––75RE
–––100E
–––125E
–––150E
–––200E
–––250E
–––500E
–––750E
–––800E
–––1K0E
–––1K5E
–––2K0E
2,500
3,000
3,500
4,000
5,000
6,000
7,500
10,000
12,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
75,000
100,000
150,000
200,000
250,000
Part no.
Prefix
Suffix
–––2K5E
–––3K0E
–––3K5E
–––4K0E
–––5K0E
–––6K0E
–––7K5E
–––10KE
–––12KE
–––15KE
–––20KE
–––25KE
–––30KE
–––35KE
–––40KE
–––50KE
–––60KE
–––75KE
–––100KE
–––150KE
–––200KE
–––250KE
34
Ohmite Mfg. Co.
1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
OHMITE [ OHMITE MFG. CO. ]
