34 Ohmite Mfg. Co. 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
270 Series
Vitreous Enamel Power
Dimensions (in. / mm) Core Standard
Series Wattage Ohms L D C Code Voltage Terminal
L12 12 0.1-51K 1.75 / 44.4 0.313 / 7.94 0.188 / 4.76 D 565 57
L25 25 0.15-100K 2.0 / 50.8 0.562 / 14.3 0.313 / 7.94 K 625 40
L50 50 0.38-260K 4.0 / 101.6 0.562 / 14.3 0.313 / 7.94 K 1625 40
L100 100 0.23-101K 6.5 / 165.1 0.750 / 19.1 0.50 / 12.7 M 2845 40
L175 175 0.13-101K 8.5 / 215.9 1.125 / 28.6 0.75 / 19.1 P 3595 46
L225 225 0.16-129K 10.5 / 266.7 1.125 / 28.6 0.75 / 19.1 P 4595 46
L500 500 0.38-218K 12.0 / 304.8 2.50 / 63.5 1.75 / 44.5 S 4970 45
L1000 1000 0.69-392K 20.0 / 508.0 2.50 / 63.5 1.75 / 44.5 S 8900 45
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 available
• “Fast on” option – see terminal
538, page 37
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
See page 36
for mounting
hardware
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.
Standard part numberS for 270 SerieS
= 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.
0.51 L12JKR51E
1 L12J1R0E
3.3 L12J3R3E
4.7 L12J4R7E
10 L12J10RE
12 L12J12RE
15 L12J15RE
22 L12J22RE
27 L12J27RE
33 L12J33RE
47 L12J47RE
68 L12J68RE
82 L12J82RE
100 L12J100E
150 L12J150E
1 –––1R0E
2 –––2R0E
3 –––3R0E
4 –––4R0E
5 –––5R0E
10 –––10RE
15 –––15RE
25 –––25RE
50 –––50RE
75 –––75RE
100 –––100E
125 –––125E
150 –––150E
200 –––200E
250 –––250E
500 –––500E
750 –––750E
800 –––800E
1,000 –––1K0E
1,500 –––1K5E
2,000 –––2K0E
180 L12J180E
270 L12J270E
330 L12J330E
390 L12J390E
470 L12J470E
560 L12J560E
1000 L12J1K0E
1200 L12J1K2E
1500 L12J1K5E
2200 L12J2K2E
2700 L12J2K7E
4700 L12J4K7E
10000 L12J10KE
18000 L12J18KE
22000 L12J22KE
51000 L12J51KE
2,500 –––2K5E
3,000 –––3K0E
3,500 –––3K5E
4,000 –––4K0E
5,000 –––5K0E
6,000 –––6K0E
7,500 –––7K5E
10,000 –––10KE
12,000 –––12KE
15,000 –––15KE
20,000 –––20KE
25,000 –––25KE
30,000 –––30KE
35,000 –––35KE
40,000 –––40KE
50,000 –––50KE
60,000 –––60KE
75,000 –––75KE
100,000 –––100KE
150,000 –––150KE
200,000 –––200KE
250,000 –––250KE
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
ordering info made-to-order partS
Tolerance
J= 5%
K= 10%
Core Diameter
See “Core and
Terminal Selection”
Ohms
R500 = 0.500 Ω
1R00 = 1 Ω
250R = 250 Ω
1K00 = 1,000 Ω
25K0 = 25,000 Ω
25K5 = 25,500 Ω
RoHS Compliant
Coating
270 = Vitreous
470 = Silicone Ceramic
Wattage
Terminal Type
See “Resistor Terminals
for Tubular Cores”
Non-inductive
Blank = Standard
N=Non-inductive
L 25J100E
Tolerance
J= 5%
K= 10%
Ohms
1R0 = 1 Ω
250 = 250 Ω
1K0 = 1,000 Ω
25K = 25,000 Ω
25K5 = 25,500 Ω
RoHS
Compliant
WattageSeries
Coating
Blank =Vitreous
C=Centohm
S=Silicone
Non-inductive
Blank = Standard
N=Non-inductive
F = Fast on
(optional)
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
rating value
12W 3,900Ω
25W 12,000Ω
50W 35,000Ω
100W 75,000Ω
No power
derating
necessary
for ratings
higher than
100W.
See website for
custom core and
terminal info
L
DC
