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| 1.Heater operation |
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1) Operating electronic power range: Electronic power applied to operable heater
2) Operating voltage range: Values calculated using the operating electric power and resistance of the heater. Within these values, the protector works properly. Range of voltage applicable to heater. Operating voltage(V) =  |
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| 2.Heater operation test method |
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When the heater is operated by the flow of electric current, as shown in the left figure, the self control protector is connected to the constant-voltage power supply and the time for the melting of the two fuses is measured. |
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| 3.Cut time by Heater (Electric Power) |
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| 4.Cut time by Heater (Voltage) |
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| 5.Cut time by Heater (Electric Power) vs Ambient temperature |
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| 7.Cut time by Current vs Ambient temperature |
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| 8.Current Carrying Capacity |
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 Test Piece Condition |
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Ambient temperature: |
25°C,
40°C,
60°C |
[It is the typical value that is calculated from 100°C, the temperature that we confirmed the reliability with our company's standard PCB(0.6t Glass Epoxy single-sided copper-clad laminates).]
[It is influenced by thermal capacity of PCB and so we recommend checking it with your PCB.] |
*The temperature that we confirmed the reliability is not a critical condition. SCP fusing-off temperature is 200°C or more. Current-carrying capacity is measured in thermal equilibrium condition. Therefore,if Current-carrying time is short, Current-carrying capacity will increase. |
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| Results |
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| Ambient temperature |
SFH-0810C |
SFH-0412B
SFH-1212B
SFH-1412B
SFH-2012B |
| 25°C |
11.0A |
13.5A |
| 40°C |
10.0A |
12.0A |
| 60°C |
8.5A |
10.0A |
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| Results |
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SFH-0810C |
SFH-0412B
SFH-1212B
SFH-1412B
SFH-2012B |
Current Rush Withstand |
80A-10ms(*) |
100A-10ms(*) |
* It is the test condition(10ms-On, 9990ms-Off, 500cycles )that we confirmed the reliability. But it is not necessarily a critical condition for SCP. |
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| 10.Melting status in different operation modes |
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| If the self control protector is operated (melted), it is possible to infer the "operation mode" from how the fuse elements have melted.
[Heater operation mode (melting by heating with a heater)]
When the heater is operated by Overcharge, "both sides of the middle electrode" usually melt because heating is continued until the flow of electric current through the heater is stopped.
If the flow of electric current through the heater is stopped due to melting of one side, the protection circuit makes "Fuses flow into the middle electrode for melting" in most cases; however, in some cases, melting occurs in only one side.
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<Characteristics of heater operation>
- Fuses flow into the middle electrode for melting.
- Both sides (or only one side) of the middle electrode are melted.
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[ Overcurrent operation mode ]
Because the system in the overcurrent operation mode works in the same way as in the normal current fuse operation mode, "melting basically occurs in only one position (it can occur in two positions by the flow of electric current of over 50 A." Cutting doesn't occur in the same position," but "Cutting occurs like bursting.
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<Characteristics of overcurrent operation>
- Cutting like bursting.
- Cutting in different position.
- Cutting basically in only one position
(*Cutting can occur in two positions by the flow of electric current of over 50 A.)
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| 11.Terminal size (Unit: mm. Not scale.) |
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| 12.Temperature profile of re-flow soldering
*The re-flow profile is on the basis of the solder temperature of the SC protector terminal electrode. |
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Self Control Protector(SCP)
SFH-0412B / 
