Littelfuse 259 Series Safe-T-Plus User Manual
Special application fuses, Safe-t-plus fuse 259 series, 259 series safe-t-plus fuse
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Special Application Fuses
259 Series Safe-T-Plus Fuse
Safe-T-Plus Fuse 259 Series
Baseefa
Description
Agency Approvals
Agency
Agency File Number
Ampere Range
Baseefa
Baseef02ATEX0071U
IECEx BAS 10.0098U
62mA - 5A
E10480
62mA - 5A
Electrical Characteristics for Series
Features
Applications
% of Ampere
Rating
Opening Time
100%
4 Hours, Minimum
200%
5 Seconds, Maximum
• Hermetically sealed
• 62mA - 5A range options
• Designed to operate
within environments
where there is danger of
gas explosion from faulty
circuits
• Meet certification for
use within intrinsically
safe apparatus for
applications such as gas
plants, petrochemical and
processing industries
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
Cold Resistance
(Ohms)
Nominal melting
I
2
t (A
2
Sec.)
Nom
Voltage
Drop
(mV)
Agency Approvals
baseefa
0.062
.062
50A @ 125 VAC
300A @ 125 VDC
7.00
0.00016
2.10
x
x
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
1.00
.001
0.128
0.256
0.24
x
x
3.00
.003
0.275
1.27
0.131
x
x
5.00
.005
50A @ 125 VAC
300A @ 63 VDC
0.0158
4.14
0.110
x
x
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 60079-
11:2007), 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).
• Testing, measuring or
processing electronic and
electrical equipment
Additional Information