30 Amp Fast Acting 437 Cross SM 125V Thin Film Surface Mount Fuses 1206
Brand Name:AMPFORT
Certification:UL,REACH
Model Number:R12.000
Minimum Order Quantity:3000 pcs
Delivery Time:7-10 Workdays
Payment Terms:T/T, Western Union, MoneyGram
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437 Cross SMT 1206 Fast Blow Thin Film SMD Fuse 125V 72V 63V 32V 0.25A-30A
Description Of The SMT 1206 Fast Blow Thin Film SMD Fuse 125V 72V 63V 32V 0.25A-30A
1206 Fast blow smd fuse designed for overcurrent protection on PCB where will bring high
working ambient temperature and high inrush current withstand capability with high I²t values typical.
A precise melting time offers ultimate protection for sensitive electronic components, while a reflow
soldering process allows surface mount fuses to be directly attached to printed circuit boards.
The SMD fuse is compatible with a wide range of circuit designs, making this fuse the best choice
for all types of consumer electronic applications.
Features Of The SMT 1206 Fast Blow Thin Film SMD Fuse 125V 72V 63V 32V 0.25A-30A
• Operating Temperature from -55ºC to +125ºC
• 100% Lead-free, HalogenFree and RoHS compliant
• Suitable for both leaded and lead-free reflow / wave soldering
• UL Recognized to UL/cUL
• Wide current range 0.25A-30A
• High voltage up to 125V
• High inrush current withstand capability
• High I²t values
• Fast blow
Fuse Cutoff Time Standard Of The SMT 1206 Fast Blow Thin Film SMD Fuse 125V 72V 63V 32V 0.25A-30A
| Rated Current | % of Amp Rating | Opening Time |
| 250mA~30A | 100% | 4hours, min |
| 1A~3A | 200% | 1.0s - 60 s |
| 1A~5A | 250% | 5.0s max |
| 1A~5A | 300% | 0.1s - 3.0 s |
| 250mA~750mA | 350% | 5.0s max |
| 6A~30A | 350% | 5.0s max |
| 250mA~30A | 1000% | 0.2ms - 20.0 ms |
Application Of The SMT 1206 Fast Blow Thin Film SMD Fuse 125V 72V 63V 32V 0.25A-30A
• LCD Displays
• Servers
• Printers
• Scanners
• Data Modems
• Power supplies
• LED driver
• UPS
• EMS
• BMS
Specification Of The SMT 1206 Fast Blow Thin Film SMD Fuse 125V 72V 63V 32V 0.25A-30A
| Specification | |||||||||||||
Part No. | Rated Voltage DC | Rated Current (A) | Breaking Capacity 1 | Typical Cold. Resistance (mOhms) 2 | Typical Voltage Drop (mV) | Typical Pre-Arcing I2t (A2Sec) 3DC | Aplha Marking | ||||||
| 72V | 63V | 32V | 24V | ||||||||||
| R12.000 0.25 | 72V | 63V | 32V | 24V | 250mA | 100A | 100A | 100A | 300A | 3608 | 1407 | 0.0004 | .25 |
| R12.000 0.375 | 375mA | 1882 | 718 | 0.0008 | E | ||||||||
| R12.000 0.5 | 500mA | 1028 | 650 | 0.0022 | 0.5 | ||||||||
| R12.000 0.75 | 750mA | 601 | 616 | 0.0057 | .75 | ||||||||
| R12.000 1 | 1A | 490 | 510 | 0.10 | H | ||||||||
| R12.000 1.25 | 1.25A | 165 | 184 | 0.021 | ▲ | ||||||||
| R12.000 1.5 | 1.5A | 240 | 367 | 0.15 | K | ||||||||
| R12.000 2 | 2A | 144 | 316 | 0.41 | N | ||||||||
| R12.000 2.5 | 2.5A | 83 | 240 | 0.65 | O | ||||||||
| R12.000 3 | 3A | 53 | 187 | 1.39 | P | ||||||||
| R12.000 3.5 | 3.5A | 40 | 180 | 1.68 | R | ||||||||
| R12.000 4 | 4A | 35 | 173 | 1.73 | S | ||||||||
| R12.000 4.5 | / | 4.5A | - | 27 | 164 | 2.62 | X | ||||||
| R12.000 5 | 5A | 22 | 141 | 2.89 | T | ||||||||
| R12.000 6.5 | 6.5A | 16 | 140 | 3.4 | 6.5 | ||||||||
| R12.000 7 | 7A | 12 | 140 | 5.68 | 7 | ||||||||
| R12.000 10 | / | 10A | - | 4.4 | 59 | 2.16 | 10 | ||||||
| R12.000 12 | 12A | 3.8 | 67 | 7.11 | 12 | ||||||||
| R12.000 15 | 15A | 2.9 | 66 | 23.89 | 15 | ||||||||
| R12.000 20 | 20A | 1.6 | 60 | 47.17 | 20 | ||||||||
| R12.000 25 | 25A | 1.4 | 57 | 32 | 25 | ||||||||
| R12.000 30 | 30A | 1 | 68 | 43 | 30 | ||||||||
Does a fuse resistor work the same as a fuse?
A resistor is available for a certain load. If the current flowing
through the resistor goes beyond the limit, it will be burned and
the circuit will be open. At this point, a resistor is similar to a
fuse, i.e., the current can be interrupted upon overcurrent. This
seems like a fuse function. In this way, some manufacturers change
the fuse in its original design to cheap fuse resistors to keep
cost down, presenting customers with superficial security.
However, is a fuse resistor able to substitute a fuse to have the same function? The answer is obviously no.
As we know, a good fuse must possess three essential functions: protection, load bearing and safety, while a fuse resistor may not be able to work well in all three aspects.
The protection function covers overload protection and short circuit protection. Specifically, a fuse must operate within the specified time when an unexpected overcurrent, even an extremely short overcurrent, occurs in the circuit, so as to protect the circuit and parts. A fuse resistor may not be as accurate as the fuse in terms of technical parameters like starting time and operation duration, and thus cannot ensure overcurrent protection. It only works to some extent for short current.
The load bearing function of a fuse is ensured by the I2t value, which enables a fuse to withstand pulse shocks of a certain energy from switching operations. We should calculate and evaluate this value before fuse selection. Nevertheless, a fuse resistor has no similar technical indexes, so it may be blown by a pulse if the value is small or fail to protect the circuit if it is large.
As for safety, a fuse can be assured through rated voltage, interrupting capacity and other indexes, especially safety compliance certification by an authorized third party. A fuse resistor is not a safety component, so it does not need certification. Its safety is therefore questionable. Furthermore, it has insufficient protection, and it's hard to ensure no hazards occur during the breaking process.
In conclusion, a fuse resistor may blow upon overcurrent, but it cannot work the same as a fuse. In most applications, it will not be appropriate to replace a fuse with a fuse resistor to cut cost.
However, is a fuse resistor able to substitute a fuse to have the same function? The answer is obviously no.
As we know, a good fuse must possess three essential functions: protection, load bearing and safety, while a fuse resistor may not be able to work well in all three aspects.
The protection function covers overload protection and short circuit protection. Specifically, a fuse must operate within the specified time when an unexpected overcurrent, even an extremely short overcurrent, occurs in the circuit, so as to protect the circuit and parts. A fuse resistor may not be as accurate as the fuse in terms of technical parameters like starting time and operation duration, and thus cannot ensure overcurrent protection. It only works to some extent for short current.
The load bearing function of a fuse is ensured by the I2t value, which enables a fuse to withstand pulse shocks of a certain energy from switching operations. We should calculate and evaluate this value before fuse selection. Nevertheless, a fuse resistor has no similar technical indexes, so it may be blown by a pulse if the value is small or fail to protect the circuit if it is large.
As for safety, a fuse can be assured through rated voltage, interrupting capacity and other indexes, especially safety compliance certification by an authorized third party. A fuse resistor is not a safety component, so it does not need certification. Its safety is therefore questionable. Furthermore, it has insufficient protection, and it's hard to ensure no hazards occur during the breaking process.
In conclusion, a fuse resistor may blow upon overcurrent, but it cannot work the same as a fuse. In most applications, it will not be appropriate to replace a fuse with a fuse resistor to cut cost.
30 Amp Fast Acting 437 Cross SM 125V Thin Film Surface Mount Fuses 1206
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