20/45M-F8R250-211 datasheet, PDF

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20/45M-F8R250-211: DescriptionFixed Resistor, Wire Wound, 20W, 8.25ohm, 1% +/-Tol, 50ppm/Cel, Chassis Mount; CategoryPassive components The resistor; File Size134KB，1 Pages; ManufacturerOhmite; Websitehttps://www.ohmite.com

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20/45M-F8R250-211 Overview

Fixed Resistor, Wire Wound, 20W, 8.25ohm, 1% +/-Tol, 50ppm/Cel, Chassis Mount

20/45M-F8R250-211 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Ohmite
package instruction	,
Reach Compliance Code	unknown
ECCN code	EAR99
Other features	FLAME PROOF, FREE AIR POWER: 20W
Installation features	CHASSIS MOUNT
Number of terminals	2
Maximum operating temperature	275 °C
Package shape	RECTANGULAR PACKAGE
Rated power dissipation(P)	45 W
resistance	8.25 Ω
Resistor type	FIXED RESISTOR
surface mount	NO
technology	WIRE WOUND
Temperature Coefficient	50 ppm/°C
Terminal shape	LUG
Tolerance	1%
Base Number Matches	1

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FEATURES

• Flameproof and inorganic

• Higher power rating due to heat

sink capacity

• All welded construction

• Nonhygroscopic

• High surge construction

Metalohm Series

Wirewound Resistors

term. style 277

term. style 276 (sq. collar, G3923)

278 (oval collar, G3860)

0.250"

1.5" max.

term. style 279

SPECIFICATIONS

Electrical

Wattage:

Based on a 275°C “U”

characteristic derating curve

Temperature coefficient:

≥18

ohm: 0 ±90ppm/°C

8 < 18 ohm: 0 ±50ppm/°C

<8 ohm: 0 ±180ppm/°C

(TC for some watt/ohm combina-

tions may be lower)

Dielectric strength:

Terminal to

case, depends on terminal style

(1500V min.)

Creepage:

term. style 277: 1.2”

term. styles 278/276: 0.4”/0.7”

term. styles 211/252/279: 0.15”

Termination Wires

• Stranded, available in any insu-

lation rated 125°C or higher

(may require term. style 297).

• Custom cut/stripped lengths

• Can be potted or pre-soldered to

terminal styles 211 or 252

• Quick connect (fully or partially

insulated), ring or spade termina-

tions available

Dielectric Sleeves

• Steatite construction

• Style 276 meets UL/NEMA

2500V RMS for one minute

requirement

• Available as terminal styles 276,

277, 278, 297

ø0.195"

ø0.068"

±0.005

" max.

1.5" max.

term. style 252

0.5" D

ø0.089"

term. style 211

ø0.171"

1" max.

1.25" max.

0.75"

term. style 297

0.437" dia.

wire

term. style 298

wire

1.25" max.

Watts

Style

w/o heat sink w/ heat sink*

20/45M

40/70M

HV40-70M

50/100M

100

60/115M

115

Dimensions (inches)

Ohmic range**

0.05-6K

1.0-25K

1.5-47.5K

2.5-81K

*Based on a 12”x12”x

” aluminum heat sink, using a thermal compound, in a 25°C ambient

**Standard winding ranges only listed, other values available; contact factory.

OPTIONS

• Noninductive versions (Aryton-

Perry windings)

• Terminal sleeves to increase

dielectric strength and maximize

creepage distance

• Variety of terminal choices

• Potted or soldered wire leads

including quick connect, ring,

spade terminals

• Tapped models

DIELECTRIC STRENGTH

Terminal Type 211

Style

20/45M

1500

40/70M

1500

HV40/70M

N/A

50/100M

1500

60/115M

1500

252, 279

N/A

1500

N/A

1500

278

277

Dielectric Strength

N/A

2500

N/A

4250

2500

N/A

2500

N/A

276

297

2500V

N/A

2500V

298

2500V

N/A

2500V

O R D E R I N G I N F O R M AT I O N

½½½½½½½½½½½½½½½½½½

Style

Non-inductive Tolerance Ohms

1R000 = 1.000

(optional)

K = 10%

10R5K = 10,500

J = 5%

H = 3%

G = 2%

F = 1%

Terminal Type

(see diagram)

Ohmite Mfg. Co.

1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

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