Littelfuse 259 User Manual

Special Application Fuses

259 Series Safe-T-Plus Fuse

Safe-T-Plus Fuse 259 Series

Agency Approvals

Agency Agency File Number Ampere Range

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Baseef02ATEX0071U
IECEx BAS 10.0098U

E10480 62mA - 5A

62mA - 5A

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Description

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 ATEx (EN 60079-0:2009 & EN 60079­11:2007), IECEx) IEC 60079-0:2007 & IEC 60079-11:2006).

The fuse design and its encapsulant are suitable for use in
intrinsically safe appartatus for voltage not exceeding 125V rms
(190V peak).

Features

• Hermeticallysealed

62mA - 5A range options

•

• Designedtooperate

within environments
where there is danger of
gas explosion from faulty
circuits

• Meetcerticationfor

use within intrinsically
safe apparatus for
applications such as gas
plants, petrochemical and
processing industries

Applications

Electrical Characteristics for Series

• Testing,measuringor

% of Ampere

Rating

100% 4 Hours, Minimum

200% 5 Seconds, Maximum

Opening Time

processing electronic and
electrical equipment

Additional Information

Datasheet

Resources

Samples

Electrical Specifications by Items

Ampere

Rating

(A)

0.062 .062

0.125 .125 1.70 0.0012 1.30 x x

0.250 .250 0.67 0.0095 0.83 x x

0.375 .375 0.395 0.025 0.81 x x

0.500 .500 0.302 0.0598 0.78 x x

0.750 .750 0.175 0.153 0.23 x x

1. 0 0 . 001 0.128 0.256 0.24 x x

3.00 .003 0.275 1.27 0.131 x x

5.00 .005

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.

Amp

Code

Interrupting

Rating

50A @ 125 VAC

300A @ 125 VDC

50A @ 125 VAC

300A @ 63 VDC

Nominal

Cold Resistance

(Ohms)

7. 0 0 0.00016 2.10 x x

0.0158 4.14 0.110 x x

Nominal Melting

2

t (A2 Sec.)

I

Nom

Voltage

Drop
(mV)

Agency Approvals

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© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13

Special Application Fuses

259 Series

259 Series Safe-T-Plus Fuse

Product Characteristics

Operating Temperature – 55°C to 90°C

Thermal Shock

Withstands 5 cycles of – 55°C to
125°C

Vibration Per MIL-STD-202F

Insulation Resistance
(After Opening)

Greater than 10,000 ohms

Soldering Parameters

Wave Soldering 260°C, 10 seconds max.

Dimensions

(.512")

13

mm

(.315")

8

mm

(.197")

(.025")

.635

mm

5

mm

(.394")

10

mm

Average Time Current Curves

.062 A

100

10

1

TIME IN SECONDS

0.1

0.01

0.001

0.1

.500 A

.375 A

.250 A

.125 A

1

CURRENT IN AMPERES

3.15 A

1 A

.750 A

Part Numbering System

0259.062M

5 A

10

100

1000

SERIES

AMP 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 Speci­fications table.

PACKAGING Code

M = Bulk pack, 1000 pcs
T = Bulk pack, 10 pcs

Example:

1 amp product is

0259001. M
(.062 amp product shown).

Specifications are subject to change without notice.

© 2013 Littelfuse, Inc.

Revised: 12/19/13