If you are looking for the data at 400% and 1000% current levels for the Littelfuse 37306300430 fuse, please note that we have checked this with the manufacturer, and the details are provided below.
The 373 Series is a fuse designed in accordance with UL 248-14.
Since UL 248-14 does not specify opening (blow) characteristics at 400% and 1000% of the rated current, we do not perform data collection under these conditions. Since the 372 Series is an IEC-compliant fuse, its datasheet includes opening characteristic data under these conditions.
On the other hand, opening characteristics at 400% and 1000% of rated current are primarily requirements based on IEC standards.
Regarding time tolerance (maximum operating time) until fuse opening
We would like to adjust our design based on the time tolerance (maximum operating time) until the fuse opens. It would be helpful if there is any documentation showing the time variation.
The variation in opening time for a given current on the Time-Current (TC) curve is generally as follows:
- At 200% of rated current: approximately ±15%
- At currents above 200% of rated current: approximately ±6%
Examples are shown below.
Example: 1A rated fuse
Based on the TC curve:
- 200% of rated current (2A): 10 seconds ±1.5 seconds
- 400% of rated current (4A): 1 second ±0.06 seconds
The above variations are general guidelines based on the typical values shown on the TC curve.
They do not represent maximum operating times guaranteed by any standard and should not be considered guaranteed values.
Applicable Part Numbers
| DigiKey Part Number | Manufacturer Part Number |
|---|---|
| WK3063BK-ND | 37315000410 |
| WK3071BK-ND | 37321000410 |
| WK3062BK-ND | 37314000410 |
| WK3057BK-ND | 37312000410 |
| WK3048BK-ND | 37311000410 |
| WK3041BK-ND | 37305000410 |
| WK6240-ND | 37318000410 |
| WK3022BK-ND | 37300500410 |
| WK3066BK-ND | 37316300410 |
| WK3046BK-ND | 37308000410 |
| WK3035BK-ND | 37302500410 |
| WK3050BK-ND | 37311250410 |
| WK3053BK-ND | 37311600410 |
| WK3024BK-ND | 37313150410 |
| WK3034BK-ND | 37302000410 |
| F4500-ND | 37321000430 |
| F4496-ND | 37314000430 |
| F4490-ND | 37311000430 |
| 18-37316300000CT-ND,18-37316300000TB-ND | 37316300000 |
| 18-37301000000CT-ND,18-37301000000TB-ND | 37301000000 |
| 18-37321000000CT-ND,18-37321000000TB-ND | 37321000000 |
| WK3025BK-ND | 37300630410 |
| WK3028BK-ND | 37301250410 |
| WK3030BK-ND | 37301600410 |
| WK3043BK-ND | 37306300410 |
| WK3037BK-ND | 37303150410 |
| WK3027BK-ND | 37301000410 |
| F4492-ND | 37311600430 |
| F4498-ND | 37316300430 |
| 18-37302000000CT-ND,18-37302000000TB-ND | 37302000000 |
| 18-37314000000CT-ND,18-37314000000TB-ND | 37314000000 |
| 18-37312000000CT-ND,18-37312000000TB-ND | 37312000000 |
| WK3058BK-ND | 37312500410 |
| F4499-ND | 37318000430 |
| WK3063CT-ND,WK3063TB-ND | 37315000000 |
| 18-37300500000CT-ND,18-37300500000TB-ND | 37300500000 |
| 1294-37311250000-CHP,F5485TB-ND | 37311250000 |
| 1294-37311000000TB-CHP,F5484TB-ND | 37311000000 |
| F4497-ND | 37315000430 |
| 18-37318000000CT-ND,18-37318000000TB-ND | 37318000000 |
| F4489-ND | 37306300430 |
| WK3026BK-ND | 37300800410 |
| F4488-ND | 37305000430 |
| F4493-ND | 37312000430 |
| F4495-ND | 37313150430 |
| F11306CT-ND,F11306TB-ND | 37305000000 |
| 18-37308000000CT-ND,18-37308000000TB-ND | 37308000000 |
| WK3035TB-ND | 37302500000 |
| WK3040TB-ND | 37304000000 |
| WK3024TB-ND | 37313150000 |
| 37301250000-ND | 37301250000 |
| 37303150000-ND | 37303150000 |
| 37306300000-ND | 37306300000 |
| 37311600000-ND | 37311600000 |
| 37301600000-ND | 37301600000 |
| 37312500000-ND | 37312500000 |
| WK3040BK-ND | 37304000410 |
| F4486-ND | 37301000430 |
| 37301250430-ND | 37301250430 |
| 37301600430-ND | 37301600430 |
| 37302000430-ND | 37302000430 |
| F4487-ND | 37302500430 |
| 37303150430-ND | 37303150430 |
| 37304000430-ND | 37304000430 |
| 37308000430-ND | 37308000430 |
| F4491-ND | 37311250430 |
| F4494-ND | 37312500430 |
| 37300800000-ND | 37300800000 |
| 37300630000-ND | 37300630000 |
| 37300500430-ND | 37300500430 |
| 37300630430-ND | 37300630430 |
| 37300800430-ND | 37300800430 |