Co d e C o Co r p o r a t i o n o f Ve r m o n t

Series: KAL, Aluminum Housed Precision Power Resistors

(5 through 250 watts)

The KAL series resistors are designed for high power dissipation with precision tolerances in a

minimum of physical size. They provide extremely efcient heat dissipation by mounting solidly to

a metal chassis surface for maximum heat transfer. All KAL series parts are RoHS compliant.

General Specications:

1. Low hot spot ratings due to exclusive complete encapsulation of the resistive element

within the anodized aluminum body

2. Welded construction throughout assures long stable load life.

3. Copperweld leads are hot tin dipped for solderability. Heavy spade log type leads are used

on the 5 through 70 watt sizes. Threaded heavy stud terminals are used on the 100 through

250 watt sizes.

4. Extruded aluminum housings are used for maximum heat dissipation.

5. Cores are centerless ground for complete uniformity.

6. Available in standard or non-inductive windings (NKAL).

Electrical Specications:

1. Resistance Range: .05W through 275K

2. Tolerances: from 5% through 0.05%

3. Temperature Coefcient: 20PPM, slightly higher on low values resistors. Different TCs are

available on special order.

4. Minimum dielectric strength: 1,000 VAC through 10 watts, 2,500 VAC through 70 watts

and 5,500 VAC through 250 watts.

5. Operating temperature range: -55°C to +275°C

6. Stability: as low as 0.001% per annum.

70 Watts Through 250 Watts

Compared To A Normal Pencil

5 Watts Through 50 Watts

Compared To A Normal

Pencil

Codeco Corporation of Vermont

West Hill Road, P.O. Box 1207

Stowe, Vermont 05672-1207

Toll Free: 866-255-8567

Telephone: 802-253-8567

Fax: 802-253-8019

Page 26

Co d e C o Co r p o r a t i o n o f Ve r m o n t

Derating:

Derating is required whenever a reduced chassis mounting area is used and when the part is

exposed to a high ambient temperature.

Curve A: When resistor is mounted on a proper chassis

Curve B: 5 & 10 watt resistor unmounted.

Curve C: 25, 70 & 100 watt resistor unmounted.

Curve D: 50, 180 & 250 watt resistor unmounted.

Proper chassis sizes:

5 & 10 watt 4 x 6 x .040 aluminum

25 watt 5 x 7 x.040 aluminum

50 & 70 watt 12 x 12 x .059 aluminum

100, 180 & 250 watts 12 x 12 x .125 aluminum.

Type Mil Watts Max A Aa B C D E F G H J K L M N

KAL5 RE60 7.5 15K .444 - .490 .600 1.13 .334 .646 .320 .065 .140 .078 .093 .078 .050

KAL10 RE65 12.5 30K .562 - .625 .750 1.38 .430 .800 .400 .075 .190 .093 .093 .102 .086

KAL25 RE70 25 50K .719 - .781 1.06 1.94 .530 1.08 .560 .085 .260 .172 .125 .155 .086

KAL50 RE75 50 150K 1.56 - .844 1.97 2.78 .615 1.14 .615 .085 .300 .196 .125 .107 .086

KAL70 - 70 275K 2.63 - .844 2.97 3.78 .625 1.16 .625 .094 .281 .196 .125 .125 .086

KAL100 RE77 100 50K 2.75 - 2.25 3.50 5.48 1.80 2.81 1.75 .188 .800 .375 .188 .250 12/24

KAL180 - 180 50K 2.77 - 2.50 3.50 5.48 2.13 3.00 2.19 .250 .950 .375 .188 .200 12/24

KAL250 RE80 250 45K 3.88 3.00 2.50 4.50 7.00 2.13 3.00 2.19 .250 1.00 .312 .188 .200 ¼/20

Ambient Temperature (°C)

25 75 125 175 225 275

100

120

% of Rated Power

KAL DERATING CURVE

Physical Dimensions

KAL5 THRU KAL70