F55J1K0 Datasheet F30J1K0, F40J100E, F40J750E | P1-P3

1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

110

250 Series

‘Thin’ Stackohm®

Vitreous Enamel Power

Series Wattage Ohms Max. Voltage*

F10 10 1.0-15K 187

F20 20 1.0-50K 815

F30 30 1.0-10K 281

F40 40 1.0-25K 655

F55 55 1.0-30K 1405

Adjustable versions and other sizes available; Consult Ohmite 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 resis-

tance value of specified product

•Smallsize-to-powerratio.

•Stackable

•Integral mounting bracket conducts heatto

mountingsurface.

•Lowprofileforuseinequipmentwherespaceis

limited.

•All-weldedconstruction.

•RoHScompliantproductavailable.Add“E”suffixto

partnumbertospecify.

Whenlimitedspaceisaconsideration,choose

Ohmite’s“thin”stackable250Typeresistors.These

oval-shapedceramic-coreresistorsfeaturealow

profiletopermitinstallationinspaceswithheight

restrictions.Theyarealsoequippedwithintegral

mountingbracketssotheycanbefastenedtoa

chassisandstackedinlocationswithlimitedsurface

area.

Whenproperlyfastened,themountingbrackets

addaheatsinkingbenefitresultinginasmallersize

perwatt.Durable250Typeresistorsarefullywelded

andcoatedwithleadfreevitreousenamel.

Coating

Lead free vitreous enamel

Core

Ceramic

Terminals

Tinned lug with hole. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu

Derating

Linearly from 100% @ +25°C to 0% @ +350°C

Tolerance

±5% (J)

Power rating

Based on mounting a single resistor on a metal surface measuring 10”

(254mm) square by 0.04” (1.016mm) thick. Reduce rating by 15% when

mounting on non-metallic surface

Overload

10x rated wattage for 5 seconds if max. voltage is not exceeded

Temperature

coefficient

1 to 20Ω: ±400 ppm/°C

Over 20Ω: ±260 ppm/°C

Dielectric with-

standing voltage

500 VAC: 10 and 20 watt rating. 1000 VAC: 30, 40 and 55 watt rating (mea-

sured from lug to mounting bracket)

Max. amps

To calculate, use the formula √P/R

CHARACTERISTICS

SERIES SPECIFICATIONS

FEATURES

1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

111

Series Wattage Length L Length A

F10 10 0.750 / 19.050 1.000 / 25.400

F20 20 2.000 / 50.800 2.313 / 58.750

F30 30 1.250 / 31.750 2.000 / 50.800

F40 40 2.000 / 50.800 2.750 / 69.850

F55 55 3.500 / 88.900 4.250 / 107.950

0.625"

15.875 mm

0.031"

0.794 mm

0.125"

3.175 mm

Diam.

0.063"

1.588 mm

Diam.

0.125"

3.175 mm

0.110":

2.776 mm

0.250"

6.350 mm

0.375"

9.525 mm

10W & 20W

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

Diam.

0.196"

4.979 mm

0.250"

6.350 mm

0.125"

3.175 mm

0.438"

11.113 mm

30W, 40W & 55W

0.375"

9.525 mm

0.125" *

3.175 mm

1.000"

25.400 mm

0.250" *

6.350 mm

0.938"

23.813 mm

0.375"

9.525 mm

*Reference dimension only; varies according to resistance

value.

Note: When resistors are stacked, use washers or spacers

as required to insure clearance and improve power dissipa-

tion.

250 Series

‘Thin’ Stackohm®

Vitreous Enamel Power

DIMENSIONS

(in. / mm)

0.625"

15.875 mm

0.031"

0.794 mm

0.125"

3.175 mm

Diam.

0.063"

1.588 mm

Diam.

0.125"

3.175 mm

0.110":

2.776 mm

0.250"

6.350 mm

0.375"

9.525 mm

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

Diam.

0.196"

4.979 mm

0.250"

6.350 mm

0.125"

3.175 mm

0.438"

11.113 mm

0.094"

2.381 mm

0.125"

3.175 mm

Diam.

0.063"

1.588 mm

Diam.

0.196"

4.979 mm

0.125"

3.175 mm

0.438"

11.113 mm

0.813"

20.638 mm

Core

size

Core

size

Core

size

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

Diam.

0.196"

4.979 mm

0.125"

3.175 mm

0.438"

11.113 mm

(SS)

Core

size

0.188"

4.763 mm

0.250"

6.350 mm

0.531"

13.494 mm

(SSH)

0.125"

3.175 mm

0.188"

4.763 mm

Diam.

0.109"

2.776 mm

0.156" x0.313"

3.969 x 7.938 mm

Slot

0.5"

12.7 mm

Core

size

0.188"

4.763 mm

Brackets

cemented

in core

MOUNTING

Inadditiontothestandardboxbracket,studtypebrackets

areavailableforstackingthestandardsizeresistors.Stud

typebracketsareavailableintwoheights:standard(SS,

0.437”/11.113mm)andhigh(SSH,0.531”/13.494mm).The

SSHstudisrecommendedwhenstackingtheadjustableType

260,asitassuresclearancefortheadjustablelugstopass

eachother.SpacerwasherNo.6027(O.D.0.219”/5.556mm,

I.D.0.125”/3.175mm,thickness0.094”/2.381mm)isrecom-

mendedforusewiththeminiatureadjustableandfixedresis-

torstoprovideclearance,asexplainedabove,orincreased

wattage.Seechart.

Derating for stacked mounting

Stackedresistorsshouldbederatedtopreventexcessivetem-

peraturesduetoproximity.Approximateratingsaregivenin

thetable.

2 70 70 75

3 60 60 69

4 50 50 60

Miniature with

0.094” (2.381 mm)

Spacer WasherMiniature

Std. or Inter.

Percent of Single Unit Rating

No. of

Resistors

(continued)

1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

112

250 Series

‘Thin’ Stackohm®

Vitreous Enamel Power

CORE AND TERMINAL SELECTION

ForMadetoOrderType250StackohmResistors

Miniature

 10 0.750”(19.050mm) 0.375”(9.525mm) 0.125”(3.175mm) 1 15,000 TA 1 1.000”(25.400mm) 0.375”(9.525mm) 51

 15 1.000”(25.400mm) 0.375”(9.525mm) 0.125”(3.175mm) 1 25,000 TA 1 1.250”(31.750mm) 0.375”(9.525mm) 51

 20 2.000”(50.800mm) 0.375”(9.525mm) 0.125”(3.175mm) 1 50,000 TA 1 2.313”(58.750mm) 0.375”(9.525mm) 51

 12 0.688”(17.463mm) 0.594”(15.081mm) 0.234”(5.953mm) 1 20,000 TB **   51

Intermediate

 21 1.000”(25.400mm) 0.813”(20.638mm) 0.250”(6.350mm) 1 8,000 TD 2 1.313”(33.350mm) 0.594”(15.081mm) 51

 25 1.500”(38.100mm) 0.813”(20.638mm) 0.250”(6.350mm) 1 15,000 TD 2 1.813”(46.050mm) 0.594”(15.081mm) 51

Standard



30 1.250”(31.750mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 10,000 TE

 5 1.750”(44.450mm)

0.938”(23.813mm) 57

        3,4 2.000”(50.800mm) 

 40 2.000”(50.800mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 25,000 TE

 5 2.500”(63.500mm)

0.938”(23.813mm) 57



        3,4 2.750”(69.850mm) 



55 3.500”(88.900mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 30,000 TE

 5 4.000”(1.1.600mm)



0.938”(23.813mm) 57

        3,4 4.250”(107.950mm) 

 70 4.750”(120.650mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 120,000

‡

 TE

 5 5.250”(133.350mm)



0.938”(23.813mm) 57



        3,4 5.500”(139.700mm) 



95 6.000”(152.400mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 150,000

‡

 TE

 5 6.500”(165.100mm)

0.938”(23.813mm) 57



        3,4 6.750”(171,450mm)

Free Air

Wattage

Rating* Length L Width W Thickness T

Code

for

Core

Dia.

Min.

Ohms

Max.

Practical

Ohms

Standard

Terminal

Fig.

No. Dimension A Dimension B

*Basedonmountingonsteeelpanel10”(254mm)x10”x0.040”(1.016mm).

†

Insidedimensionsofcoreare:0.250”(6.350mm)x0.047”(1.191mm)forTA;0.406”

(10.319mm)x0.047”(1.191mm)forTB;0.438”(11.113mm)x0.063”(1.588mm)forTD;

0.672”(17.069mm)x0.063”(1.588mm)forTE.

Core Dimensions

†

‡

ThesesizesareOhmicone(silicone-ceramic)coated–type450-460.

**Usersuppliesbrackets.

 1 –––1R0E     

 1.5 –––1R5E     

 2 –––2R0E     

 3 –––3R0E     

 4 –––4R0E     

 5 –––5R0E     

 7.5 –––7R5E   

 10 –––10RE     

 15 –––15RE   

 20 –––20RE

 25 –––25RE     

 30 –––30RE

 40 –––40RE

 50 –––50RE     

 75 –––75RE     

 100 –––100E     

 150 –––150E    

 200 –––200E     

 250 –––250E     

 300 –––300E 

 400 –––400E     

 500 –––500E     

 750 –––750E    

 800 –––800E  

 1,000 –––1K0E     

 1,250 –––1K25E   

 1,500 –––1K5E     

 2,000 –––2K0E     

 2,500 –––2K5E     

 3,000 –––3K0E     

 4,000 –––4K0E     

 5,000 –––5K0E    

 6,000 –––6K0E  

 7,500 –––7K5E    

 10,000 –––10KE     

 15,000 –––15KE    

 20,000 –––20KE    

 25,000 –––25KE    

 40,000 –––40KE  

=Standardvalues;

checkavailabilityat

www.ohmite.com

Ohmic value

F10J––– 10

F20J––– 20

F30J––– 30

F40J––– 40

Wattage

Part No.

Prefix

Suffix

F55J––– 55



Ohmic value

F10J––– 10

F20J––– 20

F30J––– 30

F40J––– 40

Wattage

Part No.

Prefix

Suffix

F55J––– 55



Wattage

Ohmic value

F10J––– 10

F20J––– 20

F30J––– 30

F40J––– 40

Part No.

Prefix

Suffix

F55J––– 55



See web-

site for

custom

core info

Tolerance

F= 1%

H= 3%

J= 5%

K= 10%

Ohms

1R0 = 1Ω

250 = 250Ω

1K0 = 1,000Ω

25K = 25,000Ω

25K5 = 25,500Ω

RoHS CompliantSeries

WattageCoating

Blank =Vitreous

C=Centohm

S=Silicone

Ohms

Example:

1R00 = 1Ω

250R = 250Ω

1K00 = 1,000Ω

25K0 = 25,000Ω

25K5 = 25,500Ω

Series

Vitreous enamel:

25 = 250 Fixed

26 = 260 Adjustable

Silicone ceramic:

45 = 450 Fixed

46 = 460 Adjustable

Wattage &

Core Code

See “Core and

Terminal Selection”

Terminal Type

See “Resistor Terminals for Tubular Cores”

Mounting Brackets

(user supplies bracket for core TB)

B= Stacking box

S= Stacking stud, std. height

H= Stacking stud high

U= Unit type

RoHS

Compliant

Tolerance

J= 5%

ORDERING INFORMATION

Made-to-order Parts

Standard Values

P1-P3

F55J1K0

Mfr. #:

Buy F55J1K0

Manufacturer:

Ohmite

Description:

Wirewound Resistors - Chassis Mount 55watt 1K 5% Stackohm

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

F55J1K0

F55J1K0

Products related to this Datasheet