Special Application Fuses
Intrinsically Safe > Surface Mount > 308 Series
Pb RoHS
308 Series 30V Intrinsically Safe Fuse
Description
The 308 Series offers a range of surface mountable
encapsulated fuses certified as intrinsically safe components
that can be used in hazardous locations. Ideal for use in oil,
gas, mine, chemical, pharmaceutical and process industries,
the 308 Series surface mountable fuse was designed to limit
the energy and temperature generated during its operation.
The fuse design and its encapsulant are suitable for use in
intrinsically safe apparatus and associated apparatus for peak
voltage not exceeding 30V.
Features
• Surface Mountable
• 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
•
Encapsulated and sealed
(0.7mm minimum)
Agency Approvals
• Designed for operation in
a range of hazardous area
applications requiring
30V peak
• RoHS-compliant and lead-
free
• Fully compatible with
lead-free solder alloys
and higher temperature
profiles associated with
lead-free assembly
Agency
Agency File Number
Ampere Rating
DEMKO 15 ATEX 1439U
(II 1 G Ex ia IIC)
0.250A – 1.5A
0.250A – 1.5A
0.250A – 1.5A
E358130
IECEx UL 15.0011U
(Ex ia IIC)
Locations per IEC and EN
60079 Series
Reference Standards
Certification
Standards
ATEX
EN 60079-0, EN 60079-11
IEC 60079-0, IEC 60079-11
IECEx
Applications
UL 913, UL 60079-0,
UL 60079-11
CAN/CSA C22.2 No. 157,
CAN/CSA C22.2 No. 60079-0,
CAN/CSA C22.2 No. 60079-11
UL
• Testing, measuring or
processing electronic and
electrical equipment
• Motor controllers
• Process control and
automation
• Sensors
cUL
• Lighting
• Communication handsets/
two-way radios
• Flow/gas meters
Electrical Characteristics for Series
% of Ampere Rating
OpeningTime
100%
250%*
350%**
4 Hours, Minimum
120 Seconds, Maximum
60 Seconds, Maximum
* Applicable to 750mA - 1.5A
** Applicable to 250mA - 1.5A
Electrical Specifications by Items
Agency Approvals
Ampere
Rating
(A)
Nominal
Melting
Minimum Cold
Resistance at
-20°C (Ohms)
Minimum Cold
Resistance at
-40°C (Ohms)
Nominal Cold
Resistance at
25°C (Ohms)
Catalog
Number
Interrupting
Rating
Amp Code
I2t (A2 Sec.)
308.25
308.375
308.5
0.25
0.375
0.5
0.25
0.375
0.5
0.004
0.01
1.856
1.022
0.712
0.52
1.821
1.006
0.676
0.511
0.216
0.236
0.144
2.29
1.33
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0.022
0.048
0.1
0.908
0.665
0.42
50A@24VAC
50A@30VDC
308.75
308001.0
3081.25
30801.5
0.75
1.0
0.75
1.0
0.226
0.24
1.25
1.5
1.25
1.5
0.22
0.318
0.209
0.333
0.182
Notes:
1. The fuse must be mounted so that creepage and clearance distances aren’t impaired in any way.
2. The fuse is suitable for use in intrinsically safe equipment and associated apparatus for voltage not exceeding 30V peak.
3. Maximum surface temperature rise at 170% rated current: 250-375mA = 23°C, 500mA = 35°C, 750mA = 53°C, 1A = 38°C, 1.25-1.50A = 96°C.
4. Minimum Cold Resistance at -30°C is available upon request.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/14/20
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