270 Series
Vitreous Enamel Power
Select 270 Type fixed resistors for applications
requiring wattage ratings from 12 to 1000 watts.
The 270 Type resistors are equipped with lug termi-
nals suitable for soldering or sturdy bolt connection.
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.
F e at u r e S
• Terminals suitable for soldering
or bolt connection
• High wattage applications
• Rugged lead free vitreous enamel coating
• Flame resistant coating
• All-welded construction
• RoHS compliant available
• “Fast on” option – see terminal 538,
http://www.ohmite.com/techdata/terminals.pdf
S e r I e S S P e C I F I C at I O N S
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
Core Code
D
K
K
M
P
P
S
S
Voltage
565
625
1625
2845
3595
4595
4970
8900
Std. Terminal
57
40
40
40
46
46
45
45
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
CharaCterIStICS
Coating
Lead free vitreous enamel. Large models (500 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.
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 rating (Measured from terminal to
mounting bracket)
Max. amps
use the formula √P/R
Power limitations for
When resistance exceeds the resistance values listed, derate the Power Rating by 25% to
high resistance values
improve reliability.
No power derating necessary for ratings higher than 100W.
Power
rating
12W
25W
50W
Resistance
value
12,000Ω
3,900Ω
100W
35,000Ω
75,000Ω
Mounting Hardware
see http://www.ohmite.com/techdata/lug-mounting.php
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
113
(continued)
270 Series
Vitreous Enamel Power
in./mm
dImeNSIONS
Series Wattage
L25
L12
25
12
L
1.75 / 44.4
4.0 / 101.6
2.0 / 50.8
D
0.562 / 14.3
0.313 / 7.94
C
0.188 / 4.76
0.313 / 7.94
0.313 / 7.94
Core Code* Std. Term.**
D
K
K
40
40
40
46
46
45
45
57
L50
D
L
C
L100
L175
L225
L500
L1000
100
175
225
1000
500
50
6.5 / 165.1
8.5 / 215.9
0.750 / 19.1
1.125 / 28.6
1.125 / 28.6
2.50 / 63.5
2.50 / 63.5
0.562 / 14.3
0.50 / 12.7
0.75 / 19.1
0.75 / 19.1
1.75 / 44.5
1.75 / 44.5
M
P
P
10.5 / 266.7
12.0 / 304.8
20.0 / 508.0
S
S
* http://www.ohmite.com/techdata/200-210-270-custom.pdf
** http://www.ohmite.com/techdata/terminals.pdf
O r d e r I N g I N F O r m at I O N
Standard
Non-inductive
F = Fast on
Blank = Standard
N = Non-inductive
(optional)
RoHS
Compliant
Made-to-order
Non-inductive
Blank = Standard
N = Non-inductive
Core Diameter
See “Core and
Terminal Selection”
RoHS Compliant
L
Series
Coating
Blank = Vitreous
C = Centohm
S = Silicone
25J100E
Wattage Tolerance Ohms
J = 5%
1R0 = 1Ω
K = 10%
250 = 250Ω
1K0 = 1,000Ω
25K = 25,000Ω
25K5 = 25,500Ω
Wattage
Coating
270 = Vitreous
470 = Silicone Ceramic
Terminal Type
See “Resistor Terminals
for Tubular Cores”
Ohms
R500 = 0.500Ω
1R00 = 1Ω
250R = 250Ω
1K00 = 1,000Ω
25K0 = 25,000Ω
25K5 = 25,500Ω
Tolerance
J = 5%
K = 10%
See website for
custom core and
terminal info
Standard part numbers for 270 series
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
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
L500J–––
500
Wattage
L225J–––
225
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
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
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
114
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