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

F E a T ur ES

• 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

S PEC i F i C a T i O n S

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% 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

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.

St andard p ar t number S for 270 S erie S



= 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









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



































Ohmic

value

12 Watt

Ohmic

value

12 Watt

Wattage

Part no.

Prefix 

Suffix

Wattage

Part no.

Prefix 

Suffix

ordering inf o

m ade-to-order p ar t S

� � � � � � � � � � � � � � � �

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

2 5 J 1 0 0 E

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

Wattage

Series

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

3,900

Ω

25W

12,000

Ω

50W

35,000

Ω

100W

75,000

Ω

No power

derating

necessary

for ratings

higher than

100W.

See website for

custom core and

terminal info

L

D

C