WFH230L27RJ datasheet, PDF - EEWORLD Datasheet

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WFH230L27RJ: DescriptionWirewound Resistors - Chassis Mount 230watt 27ohm 5% High Power; CategoryPassive components; File Size268KB，2 Pages; ManufacturerOhmite; Websitehttps://www.ohmite.com

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Wirewound Resistors - Chassis Mount 230watt 27ohm 5% High Power

WFH230L27RJ Parametric

Parameter Name	Attribute value
Product Category	Wirewound Resistors - Chassis Mount
Manufacturer	Ohmite
RoHS	No RoHS Version Available
Resistance	27 Ohms
Power Rating	230 W
Tolerance	5 %
Temperature Coefficient	150 PPM / C
Voltage Rating	1.2 kV
Operating Temperature Range	0 C to + 300 C
Length	210 mm
Width	51 mm
Height	12.6 mm
Type	Aluminum Housed Resistor
Product	Wirewound Resistors
Termination Style	Solder Lug

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WFH Series

Aluminum Housed Wirewound Power

Ohmite’s new flat core winding technology allows for wire-

wound heatsinkable resistors affording a very low profile, and

superior thermal transfer characteristics when compared to

conventional aluminum housed wirewound resistors.

Close mounting of heat sensitive components is possible

due to only a slight rise of the temperature on the aluminum

profile.

No heat sink compound is required because of large mount-

ing surface.

F e at u r e S

• Solder lug, wire, and “Fast-on” amp ter-

minations

• Multiple resistors in one profile possible

• Custom wire lengths available

S e r i e S S P e c i F i c at i O N S

*at 40°C base plate temperature

Type

WFH90

WFH160

WFH230

WFH330

Power Rating*

(watts)

160

230

330

Resistance Range

(Ω)

0.22Ω – 6.8K

0.47Ω-18K

0.82Ω-27K

1Ω - 39K

cHaracteriSticS

Power rating

90W-330W

Resistance

±5%, ±10%

tolerance

Temperature

Normal: 50ppm - 150ppm

Coefficients

Low ohmic values: 400ppm

Dielectric

2500 VAC peak

strength

Working voltage

1200 VAC

Test voltage

6000 VAC

Lead wire

(wire terminal version only): XLPE, 600V, 125C,

18 AWG stranded

Insulation

Silicone Rubber & Mica. The Silicone is

UL-recognised (UL 94 HB) to a working tem-

perature of 220°C. Temperatures of up to

300°C can be endured for shorter periods.

This may however cause an expansion of the

silicone rubber with a possibility of reducing

the dielectric strength.

Min. Storage &

-40˚C

Operating Temp.

W/Resistor

Power Dissipation

350

300

250

200

150

100

WFH330

WFH230

WFH160

WFH90

40°

60°

80°

100°

120°

Heat Sink Temperature,

°C

140°

This graph shows the maxi-

mum wattage rating for each

possible resistor of standard

size corresponding to the

heat sink temperature. It is

assumed that all resistors

are equally loaded.

Thermal Resistances

Thermal Resistance (°C/W) between different

measuring points

resistor

surface to

heat sink

WFH90 WFH160 WFH230 WFH330

0.75

0.5

6.8

3.9

2.75

0.1

0.05

0.03

0.02

0.3

0.17

0.1

0.085

TH4

aluminum

housing

to air

TH2

aluminum

housing to

heat sink

TH3

TH1

wire to

aluminum

housing

THIS PRODUCT IS DESIGNED FOR

USE WITH PROPER HEATSINKING.

Maximum base plate temperature of the resistor must be monitored

and kept within specified limits to establish the power rating. Best

technique is to attach a thermocouple to the side of the base plate of

the resistor. Temperature of plastic housing or heat sink cannot be

used to establish rating of the resistor.

(continued)

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

133

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Product Category	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount	Wirewound Resistors - Chassis Mount
Manufacturer	Ohmite	Ohmite	Ohmite	Ohmite	Ohmite	Ohmite	Ohmite	Ohmite
RoHS	No RoHS Version Available	No RoHS Version Available	No RoHS Version Available	No RoHS Version Available	No RoHS Version Available	No RoHS Version Available	No RoHS Version Available	No RoHS Version Available
Resistance	27 Ohms	75 Ohms	27 Ohms	1 Ohms	1 Ohms	50 Ohms	150 Ohms	5 Ohms
Power Rating	230 W	90 W	330 W	230 W	160 W	230 W	160 W	230 W
Tolerance	5 %	5 %	5 %	10 %	10 %	5 %	5 %	10 %
Temperature Coefficient	150 PPM / C	150 PPM / C	150 PPM / C	150 PPM / C	150 PPM / C	150 PPM / C	150 PPM / C	150 PPM / C
Voltage Rating	1.2 kV	1.2 kV	1.2 kV	1.2 kV	1.2 kV	1.2 kV	1.2 kV	1.2 kV
Operating Temperature Range	0 C to + 300 C	0 C to + 300 C	0 C to + 300 C	0 C to + 300 C	0 C to + 300 C	0 C to + 300 C	0 C to + 300 C	0 C to + 300 C
Length	210 mm	70 mm	280 mm	210 mm	140 mm	210 mm	140 mm	210 mm
Width	51 mm	51 mm	51 mm	51 mm	51 mm	51 mm	51 mm	51 mm
Height	12.6 mm	12.6 mm	12.6 mm	12.6 mm	12.6 mm	12.6 mm	12.6 mm	12.6 mm
Type	Aluminum Housed Resistor	Aluminum Housed Resistor	Aluminum Housed Resistor	Aluminum Housed Resistor	Aluminum Housed Resistor	Aluminum Housed Resistor	Aluminum Housed Resistor	Aluminum Housed Resistor
Product	Wirewound Resistors	Wirewound Resistors	Wirewound Resistors	Wirewound Resistors	Wirewound Resistors	Wirewound Resistors	Wirewound Resistors	Wirewound Resistors
Termination Style	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug

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