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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/31/18
Special Application Fuses
PICO® 259 Series Safe-T-Plus Fuse for Hazardous Locations
PICO® 259 Series Safe-T-Plus Fuse
Description
Agency Approvals
Reference Standards
Agency Agency File Number Ampere Range
Baseefa02ATEX0071U 0.062A - 5A
IECEx BAS 10.0098U 0.062A - 5A
E10480
E358130 0.062A - 5A
Agency Standards
ATEX EN 60079-0, EN 60079-11
IECEx IEC 60079-0, IEC 60079-11
UL UL 913, UL 60079-0, UL 60079-11
Electrical Characteristics for Series
Features
Applications
RoHS
% of Ampere
Rating Opening Time
100% 4 Hours, Minimum
200% 5 Seconds, Maximum
Encapsulated and sealed
(1mm minimum)
0.062A - 5A range options
Designed to operate
within environments
where there is danger of
gas explosion from faulty
circuits
ATEX and IECEx certified
components
RoHS compliant
Suitable for use in Class
I, Groups A, B, C and
D; Class II, Groups E,
F and G; Class III and
Class I, Zone 0, AEx ia IIC
Hazardous Locations.
Suitable for use in Gas,
Zone 0 Hazardous
Locations per IEC and EN
60079 Series
The Safe-T-Plus 259 Series offers a range of encapsulated
fuses designed to enable greater safety for operating
electronic equipment within potentially explosive
environments. Originally designed to serve the needs of gas
plants, petrochemical and processing industries, these fuses
are certitifed for use within intrinsically safe apparatus with
ATEX and IECEx certifications.
The fuse design and its encapsulant are suitable for use in
intrinsically safe appartatus and associated apparatus for
voltage not exceeding 125V rms (190V peak).
Testing, measuring or
processing electronic and
electrical equipment
Additional Information
Datasheet Samples
Resources
Application testing is strongly recommended.
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/31/18
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
110 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
Electrical Specifications by Items
Schedule of limitations:
1) The fuse must be so mounted that creepage and clearance distances aren’t impaired in any way.
2) The fuse is suitable for use in intrinsically safe equipment for voltages not exceeding 190V peak.
3) Maximum surface temperature rise at 170% rated current: ≤750mA=40ºC, 1A=55ºC, 3A=118ºC and 5A=135ºC.
Ampere
Rating
(A)
Amp
Code
Interrupting
Rating
Nominal
Melting
I2t (A2 Sec.)
Minimum Cold
Resistance at
-20°C (Ohms)
Minimum Cold
Resistance at
-40°C (Ohms)
Nominal Cold
Resistance at
25°C (Ohms)
Agency Approvals
0.062 .062
50A @ 125 VAC
300A @ 125 VDC
0.00011 4.89 4.39 7. 0 0 x x x
0.125 .125 0.0012 1.35 1.26 1.70 x x x
0.250 .250 0.0095 0.51 0.48 0.665 x x x
0.375 .375 0.025 0.32 0.29 0.395 x x x
0.500 .500 0.0598 0.24 0.22 0.302 x x x
0.750 .750 0.153 0.14 0.12 0.175 x x x
1. 0 0 0 01. 0.256 0.10 0.07 0.128 x x x
3.00 003. 1.27 0.03 0.01 0.03 x x x
5.00 005. 50A @ 125 VAC
300A @ 63 VDC 4.14 0.01 0.005 0.0158 x x x
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/31/18
Special Application Fuses
PICO® 259 Series Safe-T-Plus Fuse for Hazardous Locations
Dimensions
(.512")
13mm
(.394")
10mm
(.025")
.635mm
(.315")
8mm
(.197")
5mm
Part Numbering System
0259.062M
SERIES
AMP Code
PACKAGING Code
The dot is poisitioned before the
Packaging Suffix with whole ratings
and within the numbering sequence
for fractional ratings. Refer to Amp
Code column in the Electrical Speci-
fications table.
M = Bulk pack, 1000 pcs
T = Bulk pack, 10 pcs
Example:
1 amp product is
0259001.M
(.062 amp product shown).
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code
Bulk N/A 1000 M = Bulk 1000 pieces, T = Bulk 10 pieces
Please refer to available quantities above in “Part Numbering System”
Bulk N/A 10
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each
product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at:
www.littelfuse.com/disclaimer-electronics.
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