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| PartNumber | LR4-450F | LR4-450 | LR4-450L |
| Description | Resettable Fuses - PPTC 4.5A 20V 100A Imax | Resettable Fuses - PPTC 4.5A 20V 100A Imax | Resettable Fuses - PPTC 4.5A 20V 100A Imax |
| Manufacturer | Littelfuse | TE Connectivity Raychem Circuit Protection | - |
| Product Category | Resettable Fuses - PPTC | PTC Resettable Fuses | - |
| RoHS | Y | - | - |
| Series | LR4 | PolySwitchR | - |
| Mounting Style | Strap | Strap | - |
| Termination Style | Axial | Axial | - |
| Hold Current | 4.5 A | 4.5 A | - |
| Maximum Voltage | 20 V | 20 VDC | - |
| Trip Current | 8.9 A | 8.9 A | - |
| Current Rating Max | 100 A | - | - |
| Resistance | 20 mOhms | 0.02 Ohms | - |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 125 C | - | - |
| Packaging | Bulk | Bulk | - |
| Height | 1 mm | 1 mm | - |
| Length | 26 mm | 26 mm | - |
| Type | PolySwitch Resettable Devices | PolySwitch Resettable Devices | - |
| Width | 10.5 mm | 10.5 mm | - |
| Brand | Littelfuse | - | - |
| Pd Power Dissipation | 1.4 W | - | - |
| Product Type | Resettable Fuses - PPTC | - | - |
| Factory Pack Quantity | 1000 | - | - |
| Subcategory | PPTC Resettable Fuses | - | - |
| Tradename | PolySwitch | - | - |
| Part # Aliases | 177226-000 RF1542-000 | - | - |
| Part Aliases | - | 177226-000 RF1542-000 | - |
| Operating Temperature Range | - | - 40 C to + 125 C | - |
| Package Case | - | Strap | - |
| Current Max | - | 100A | - |
| Current Hold Ih Max | - | 4.5A | - |
| Voltage Max | - | 20V | - |
| Current Trip It | - | 8.9A | - |
| R Min Max | - | 0.011 ~ 0.020 Ohm | - |
| Time to Trip | - | 5s | - |
| Current Rating Max | - | 100 A | - |
| Pd Power Dissipation | - | 1.4 W | - |