Bussmann
®
Microtron
®
Printed Circuit Board Fuses
.122∑ ≈ .297∑ (3.10mm ≈ 7.54mm)
MCR
R
Time-Current Characteristic Curves–Average Melt
(Full Size Curves Available)
AMPERE
RATING
1/4
3/8
1/2
3/4
1.0 1.5
2.0 2.5
3.0
4.0 5.0
7.0
10.0
Actual Size
Product Name:
MCR (Microtron
®
)
Characteristics:
Fast Acting, Current Limiting
Construction:
Solid Matrix
Packaging & Ordering Information:
Dimensional Data
1.13"
28.58mm
.12"
3.10mm
.025"
0.64mm
MCR
Product
Rated Current
Symbol
(See Table)
*All tolerances:
±0.005"
±0.13mm
10
1
TIME IN SECONDS
1.13"
28.58mm
.297"
7.54mm
.1
.01
Weight = 2.45 lbs/2500
CURRENT IN AMPERES
Time-Current Characteristics:
Rated
Current
0-10A
100%
4 hrs. (min)
Percent of Rating
250%
5 sec. (max)
CE logo denotes compliance with European Union Low Voltage Directive
(50-1000 VAC, 75-1500 VDC). Refer to BIF document #8002 or contact
Bussmann Application Engineering at 314-527-1270 for more information.
Electrical Characteristics
Rated
Voltage
AC (Max.)
DC (Max.)
Interrupting
Rating
1
AC
DC
Pre-arcing
2
I
2
t (A
2
sec)
AC
10
-6
DC
Typical Total Clearing
2
I
2
t (A
2
sec)
AC
DC
Typical Voltage
Drop Volts at
100% Rated
Current
Agency*
Approvals
CSA
JIS
UR
Current
Rating
⁄Ω¡§
⁄Ω•
⁄Ω¢
‹Ω•
⁄Ω™
‹Ω¢
1
1⁄Ω
™
2
2⁄Ω
™
3
3⁄Ω
™
4
5
7
10
*
Approvals:
125V
125V
50A
300A
1.1
≈
1.0
≈
10
-7
1.8
≈
10
-6
1.5
≈
10
-7
2.33
• •
-6
-7
-6
125V
125V
50A
300A
4.3
≈
10
7.1
≈
10
7.3
≈
10
8.7
≈
10
-7
1.52
• •
125V
125V
50A
300A
8.0
≈
10
-5
1.0
≈
10
-6
1.2
≈
10
-4
1.3
≈
10
-6
.76
• •
125V
125V
50A
300A
9.7
≈
10
-5
6.7
≈
10
-6
1.1
≈
10
-4
8.3
≈
10
-6
.73
• •
125V
125V
50A
300A
7.4
≈
10
-4
5.4
≈
10
-5
6.2
≈
10
-3
6.8
≈
10
-5
.65
• •
125V
125V
50A
300A
1.3
≈10
-3
7.4
≈
10
-5
7.5
≈
10
-2
9.2
≈
10
-5
.55
• •
125V
125V
50A
300A
.01
.01
.02
.01
.24
• • •
125V
125V
50A
300A
.03
.02
.04
.03
.20
• • •
125V
125V
50A
300A
.09
.07
.11
.08
.16
• • •
125V
125V
50A
300A
.19
.14
.25
.17
.15
• • •
125V
125V
50A
300A
.35
.28
.45
.32
.15
• • •
125V
125V
50A
300A
.56
.37
.83
.43
.14
• • •
125V
125V
50A
300A
.96
.67
1.37
.77
.13
• • •
125V
125V
50A
300A
1.82
1.34
2.53
1.51
.11
• • •
60V
90V
50A
300A
1.48
.49
2.02
.58
.10
• •
60V
90V
50A
300A
3.62
1.16
4.41
1.38
.08
• •
UL Recognition STD 248-14, Guide JDYX2, File E19180; CSA Certification, Class 1422-01, File 53787.
JIS (Japanese Industrial Standard) Reg. No. 2221, Authorization No. 32-1516.
1. Interrupting ratings were measured at 100% (⁄Ω
¡§
to 5) and 100% (7, 10) power factors on AC, and a time constant less than 1ms. on D.C.
2. I
2
t was measured at 50 amps 125 VAC, .95PF, (random closing angle) and 300 amps 125 VDC, TC <1ms. for
⁄Ω¡§
through 5 amps and 50 amps 60 VAC, .95PF, (random
closing angle), and 300 amps 90 VDC, TC <1ms. for the 7 and 10 amp fuses.
Note:
All values shown above are typical.
100
Form No. MCR
Page 1 of 2
BIF Doc #2003
.01
12-21-98
SB98107
Rev. A
10
Package Code
Blank10
in
BK
500 in
TR/
Tape/Reel 2500 units, 52.4mm spacing
TR1/
Tape/Reel 5000 units, 52.4mm spacing
TR6/
Tape/Reel 1000 units, 52.4mm spacing
Radial leaded versions available (.4∑, .6∑ spacing)
.001
.1
1
1/16
1/8
Bussmann
®
Microtron
®
Printed Circuit Board Fuses
.122∑ ≈ .297∑ (3.10mm ≈ 7.54mm)
MCR
R
Typical Voltage Drop (At 25° C Ambient Temperature)
0.25
0.2
Voltage Drop
0.15
0.1
0.05
MCR-1
MCR-1⁄Ω™
MCR-2
MCR-2⁄Ω™
MCR-3
MCR-3⁄Ω™
MCR-5
MCR-10
MCR-4
MCR-7
0
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Percent of Rated Curent
2
MCR-
⁄Ω¡§
1.8
1.6
1.4
1.2
MCR-
⁄Ω¢
1
MCR-
‹Ω•
0.8
MCR-
⁄Ω•
MCR-
⁄Ω™
0.6
MCR-
‹Ω¢
0.4
0.2
0
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Percent of Rated Current
Microtron fuses are designed to meet the following specifications:
Body
High temperature thermoplastic,
flammability rating UL 94 VO.
Resistance to
Soldering Heat
Salt Spray
Shock
Solderability
Terminal Strength
MIL-STD-202, Method 210, Test
Condition C (260°C).
MIL-STD-202, Method 101, Test
Condition B.
MIL-STD-202, Method 213, Test
Condition I, 100G’s for 6 milliseconds.
MIL-STD-202, Method 208.
MIL-STD-202, Method 211, Test
Condition A, will withstand 7 lb. axial pull
test.
MIL-STD-202, Method 107, Test
Condition B, -65°C to 125°C.
EIA-STD-RS-186-C, Test Condition A,
-55°C to 85°C.
MIL-STD-202, Method 204, Test
Condition C, (55 to 2000 HZ, 10G’s
peak).
Maximum reservoir temperature 260°C,
10 second maximum exposure, .125"
from body.
Electrical Characteristics
Carry 100% rated current for 4 hours
minimum. Open at 250% of rated
current in 5 seconds maximum.
Element
Leads
Lead Bend Test
Solid Matrix, gold or silver element
encapsulated in ceramic.
Tin-plated copper, .64mm (.025∑)
diameter.
With a two pound weight attached, 90°
one direction, back to original position,
then 90° opposite direction; fuse will
withstand two cycles.
2000 hours at 80% rated current,
55°C.
MIL-STD-202, Method 106, 90%
relative humidity at 65°C.
-55°C to 125°C with proper fuse
derating.
EIA-STD-296-E.
Thermal Shock
Thermal Cycle
Vibration
Life Test
Moisture Resistance
Operating Temperature
Packaging
Wave Soldering
The only controlled copy of this BIF document is the electronic read-only version located on the 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. Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products. 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.
Voltage Drop
12-21-98
SB98107
Rev. A
Form No. MCR
Page 2 of 2
BIF Doc #2003
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