General-Purpose Failsafe

Moulded Wirewound Resistors

SPH/SPF Series

Make Possible

07.14

General Note

TT Electronics reserves the right to make changes in product specification without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

© TT Electronics plc

www.ttelectronicsresistors.com

General Purpose Failsafe

Molded Wirewound Resistor

SPH/SPF Series

www.bitechnologies.com www.irctt.com www.welwyn-tt.com

General Note

TT electronics reserves the right to make changes in product specification without notice or liability.

All information is subject to TT electronics’ own data and is considered accurate at time of going to print.

© TT electronics plc

01.14

• 4222 South Staples Street • Corpus Christi Texas 78411 USA

Wire and Film Technologies Division

Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com

SPH Power Derating Curve

2.0

2.5

1.5

1.0

0.5

0

Ambient Temperature (°C)

0

50

100

150

200

70

160

General Purpose Failsafe

Molded Wirewound Resistor

SPF Power Derating Curve

SPF Typical Fusing

SPH and SPF

Temperature Rise Chart

2.0

2.5

1.5

1.0

0.5

0

Ambient Temperature (°C)

0

50

100

150

200

70

20

25

15

10

5

0

Time (seconds)

0

20

40

60

80

100

2

0.1 ohm

1 ohm

10 ohm

100 ohm

1000 ohm

125

150

100

75

50

25

Power Input (watts)

0

0.5

1.0

1.5

2.0

0

SPH/SPF Series Issue December 2008 Sheet 3 of 3