Littelfuse.com/SPF

© 2021 Littelfuse, Inc.

Rev: 113021

4 of 6

SPF SERIES SOLAR FUSES

AMPERAGE

RATING

OPENING TIME (MINUTES)

100 % of Amp

Rating per UL

113 % of Amp

Rating per IEC

135 % of Amp

Rating per UL

145 % of Amp

Rating per IEC

200 % of Amp

Rating per UL

1–30

Temperature

Stabilization

60 Min

60 Max

60 Max

4 Max

WAVE PARAMETER

LEAD FREE RECOMMENDATION

Preheat:

(Typical industry recommendation)

Temperature minimum:

130 ˚C

Temperature maximum:

—

Pre-heat time

75 seconds maximum

Solder pot temperature

280 ˚C maximum

Solder dwell time

270 ˚C for 8 seconds maximum

Complete cycle time

250 seconds maximum

Recommended Process Parameters

Soldering Parameters

-60°C

-40°C

-20°C

0°C

20°C

40°C

60°C

80°C

100°C

120°C

140°C

-76°F

-40°F

-4°F

32°F

68°F

104°F

140°F

176°F

212°F

248°F

284°F

AMBIENT TEMPERATURE

60

40

20

0

0

20

40

60

Temperature Derating Curve (temperature of air immediately surrounding fuse)

Electrical Specification – Agency Requirements