| Part Number | RKEF300 | RKEF400 |
|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. |
| Category | PTC Resettable Fuses | PTC Resettable Fuses |
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|
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| Product Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 60V | 60V |
| Current - Max | 40 A | 40 A |
| Current - Hold (Ih) (Max) | 3 A | 4 A |
| Current - Trip (It) | 6 A | 8 A |
| Time to Trip | 19.8 s | 24 s |
| Resistance - Initial (Ri) (Min) | 30 mOhms | 14 mOhms |
| Resistance - Post Trip (R1) (Max) | 80 mOhms | 60 mOhms |
| Resistance - 25°C (Typ) | - | - |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Ratings | - | - |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | Radial, Disc | Radial, Disc |
| Size / Dimension | 0.650" L x 0.118" W (16.50mm x 3.00mm) | 0.827" L x 0.118" W (21.00mm x 3.00mm) |
| Height - Seated (Max) | 0.835" (21.20mm) | 0.980" (24.90mm) |
| Thickness (Max) | - | - |
| Lead Spacing | 0.199" (5.05mm) | 0.400" (10.15mm) |