1/4” x 1 1/4” Time-Delay Ceramic Tube Fuses
MDA Series
Environmental Data
• Shock: 1/100A and 8/10A – MIL-STD-202, Method 213,
Test Condition I; 1A thru 30A – MIL-STD-202, Method 213,
Test Condition J
• Vibration: 1/100A and 8/10A – MIL-STD-202, Method 201;
1/4A thru 30A – MIL-STD-202, Method 204, Test Condition C
(Except 5g, 500Hz)
Dimensions - mm (in)
Drawing Not to Scale
Description
•
•
•
•
•
Time-delay
Optional axial leads available
1/4” x 1-1/4” (6.35 x 31.75mm) physical size
Ceramic tube, nickel-plated brass endcap construction
UL Listed product meets standard 248-14
Rated Current
1/4 - 30A
Electrical Characteristics
Amp Rating
Opening Time
100%
None
135%
60 Minutes Max.
200%
120 Seconds Max.
38.10
(1.500)
32.82
(1.292)
38.10
(1.500)
6.76
(0.266)
DIA. OF LEADS
0.81
0–15 AMP:
(0.032)
20–30 AMP: 1.02
(0.040)
31.75
(1.250)
6.35
(0.250)
Agency Information
•
•
•
•
UL Listed Card: MDA
2
/
10
- 20A (Guide JDYX, File E19180)
UL Recognized Card: MDA 25 - 30A (Guide JDYX2, File E19180)
CSA Certification Card: MDA
2
/
10
- 20 (Class No. 1422-01)
CSA Component Acceptance: MDA 25-30A (Class No. 1422-30)
Ordering
• Specify packaging, product and option code.
Specifications
Part
Number
MDA-1/4-R
MDA-1/2-R
MDA-3/4-R
MDA-1-R
MDA-1-1/2-R
MDA-2-R
MDA-2-1/2-R
MDA-3-R
MDA-4-R
MDA-5-R
MDA-6-R
MDA-7-R
MDA-8-R
MDA-10-R
MDA-12-R
MDA-15-R
MDA-20-R
MDA-25A-R
MDA-30A-R
*
**
†
‡
Voltage Rating
Vac
Vdc
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
-
250
125
250
125
250
125
AC Interrupting
Rating* (amps)
250V
125V
35
10000
35
10000
35
10000
35
10000
100
10000
100
10000
200
10000
200
10000
200
10000
200
10000
200
10000
200
10000
200
10000
200
10000
750
10000
750
10000
1500 10000
1500 10000
1500 10000
DC Interrupting
Rating (amps) 125V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
10000
10000
10000
Typical DC Cold
Resistance** (Ω)
8.7
1.78
0.82
0.56
0.2565
0.17
0.068
0.0525
0.03575
0.0256
0.02035
0.0165
0.013
0.00925
0.00755
0.00565
0.004065
0.0031
0.002465
Typical
Typical Voltage
2
Melting I t† AC
Drop‡
0.748
4.00
2.53
1.42
8.58
1.31
12.21
1.03
27.5
0.691
70.4
0.623
31.79
0.213
44.99
0.182
147.4
0.162
380.49
0.145
587.73
0.141
638.33
0.137
1038.4
0.134
1620.43
0.135
125.18
0.128
336.82
0.107
483.45
0.095
734.69
0.105
1096.7
0.110
Interrupting Ratings (Measured at 70% - 80% power factor on AC. The interrupting ratings for 25A, 30A were measured at 90% - 100% power factor on AC)
DC Cold Resistance (Measured at <10% of rated current)
_
Typical Melting I
2
t (A
2
Sec) (I
2
t was measured at listed interrupting rating and rated voltage)
Typical Voltage Drop (Voltage drop was measured at 25°C ambient temperature at rated current)
0711
BU-SB11875
Page 1 of 2
Data Sheet 2002
Time-Current Curves
CURRENT IN AMPS
3-2/10
4
5
6-1/4
1/4
1/2
TIME IN SECONDS
10
12
15
20
25
30
1
2
TIME IN SECONDS
CURRENT IN AMPS
Packaging Code
Packaging Code Prefix
BK-
BK1-
BK8-
Description
100 fuses packed into a cardboard carton
1,000 fuses packed into a cardboard carton
8,000 fuses packed into a cardboard carton
Option Code
Option Code
B
V
Description
Sealed to withstand aqueous cleaning (Board Washable)
Axial leads - copper tinned wire with nickel plated brass overcaps
The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is
intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information con-
tained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
Life Support Policy: Cooper Bussmann does not authorize the use of any of its products for use in life support devices or systems without the express written approval of an officer of the Company. Life sup-
port systems are devices which support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result
in significant injury to the user.
© 2011 Cooper Bussmann
www.cooperbussmann.com
0711
BU-SB11875
Page 2 of 2
Data Sheet 2002
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