BEL SMP2A

defining a degree of excellence
Type SMP 2A
Surface Mount Power Cross Protection Fuse
26-Aug-03
SMP Surface mount Power Cross Protection Fuses are primarily
intended for use in telecommunication circuit applications requiring low
current protection with high surge tolerance. They are typically used to
replace heat coil type devices. They are designed to be placed between
the line input and the surge arresting components (mov. gas tube,
zenor diode, air gaps, etc.)
Catalog
Number
Ampere
Rating
SMP 2
Voltage
Rating
2A
Typical Cold
Resistance
Volt-drop
@100% In
Melting I²T
< 10 mSec
Melting I²T
@ 10 In
(ohm)
(Volt) max.
(A² Sec)
(A² Sec)
Maximum
Power
Dissipation
(w)
0.055
0.20
14.0
17.0
0.71
600V
Consult manufacturer for other ratings
These fuses will withstand transient surge currents generated by
lighting in accordance with the attached table.
SMP fuses guard protected circuitry against sustained overload or
short circuit conditions. Such sustained overloads may be generated by
accidental contact between utility cables and phone lines (power line
cross).
SMP Fuse are used in circuits to obtain compliance with the test
requirements specified in UL 1950/60950 and Bellcore GR 1089.
SURGE WITHSTAND RATINGS
Voltage
Peak
Surge
Current
Maximum
Rise/Duration
Time
Repetitions
1000V
120A
10 uS x 1000 uS
100 Pulses ( 50 Each Polarity)
2500V
500A
2 uS x 10 uS
40 Pulses ( 20 Each Polarity)
5000V
500A
2 uS x 10 uS
4 Pulses ( 2 Each Polarity)
Double -exponential Impulse Waveform
Electrical Characteristics (UL STD. 248-14)
Power Cross (Telecom) Rating
Clearing Time Limit
Blow Time
Testing Current
110%
Minimum
Maximum
4 hrs.
N/A
Overload Current
Voltage
Minimum
Maximum
3A
600V
1.1 sec
900 sec
200%
N/A
60 sec
7A
600V
0.4 sec
2.5sec
500%
100 msec
1.5 sec
30A
600V
N/A
65 msec
1000%
30 msec
300 msec
60A
600V
N/A
13 msec
Current
Waveform Duration Of A/B Seconds
A=Rise Time=T1-T0 (1.25(b-a)
B= Duration =T2-T0
(Peak Value) Ip
0.1 Ip
Safety Agency Approvals
Approval Standards
File No.
a
T0
Interrupting Rating
Power
Factor
Intended Application
[email protected] 600Vac
Resistive
Telecom Protection
Recognized File
no. E20624
[email protected] 125Vdc
Resistive
b
T1
Physical specification
Materials
Ceramic Body / Tin Plated Brass Caps
Lead Free Solder
Marking
On fuse: "bel", "Current Rating"
General Purpose
On label: Above info; "Type", "Voltage Rating", "Appropriate Safety Logos"
Interrupting Rating plus "
Environmental Specifications
Soldering Techniques & Compatability
Packaging
"
2000 fuses in 13 inches dia. Reel, 16mm wide tape, 8mm pitch, per EIA standard 481
Reflow: 240°C, 30sec max.
Wave Solder: 260°C, 3 sec max.
Mechanical Dimensions
Shock
MIL-STD-202, Method 213, Test Condition I
(100 G's peak for 6 milliseconds).
Vibration
bel 2A
MIL-STD-202, Method 201 (10-55 Hz, 0.06 inch, total excursion).
Salt Spray
MIL-STD-202, Method 101, Test condition B (48 hrs).
Insulation Resistance
MIL-STD-202, Method 302, Test Condition A
(After Opening) 10,000 ohms minimum.
Solderability
MIL-STD-202, Method 208.
Resistance to solder Heat:
MIL-STD-202, Method 210, Test Condition J (235°C, 30 sec)
Thermal Shock
MIL-STD-202, Method 107, Test Condition B
(-65°C to +125°C)
Operating Temperature
-55°C to +125°C
Specification Subject To Change Without Notice
SMP
Time
T2
defining a degree of excellence
Type SMP 2A
Surface Mount Power Cross Protection Fuse
SMP - TIME CURRENT CHARACTERISTIC CURVE
2A
10000
1000
TIME IN SECONDS
100
10
1
0.1
0.01
0.01
0.1
1
10
CURRENT IN AMPERES
100
1000