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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Special Application Fuses
PICO
®
259 Series Safe-T-Plus Fuse for Hazardous Locations
Product Characteristics Average Time Current Curves
100
100
10
1
0.1
0.01
0.001
1
10
1000
0.1
TIME IN SECONDS
CURRENT IN AMPERES
1 A .750 A .500 A
3.15 A
5 A
.125 A
.062 A .375 A .250 A
259 Series
Materials
Body : Polyamide
Terminals - Tin Plated Copper Alloy
Max. operating temperature of materials 130°C
Operating
Temperature
Operating temperature depends on fuse
rating and max. allowed fuse surface
temperature. (Consider re-rating)
Thermal Shock Withstands 5 cycles of – 55°C to 125°C
Vibration Per MIL-STD-202, Method 201
Insulation
Resistance
(After Opening)
Greater than 10,000 ohms
Note:
1. Re-rating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
Temperature Re-rating Curve
Soldering Parameters
Recommended Hand Soldering Parameters:
Solder Iron Temperature: 350°C +/- 5°C
Heating Time: 5 seconds max.
Note: These devices are not recommended for IR or
Convection Reflow process
Recommended Process Parameters:
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
Temperature Minimum:
100
°C
Temperature Maximum:
150
°C
Preheat Time: 60-180 seconds
Solder Pot Temperature:
260
°C Maximum
Solder Dwell Time: 2-5 seconds