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| Part Number | 30R500U | 30R500UF | 
|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. | 
| Product Status | Obsolete | Active | 
| Type | Polymeric | Polymeric | 
| Voltage - Max | 30V | 30V | 
| Current - Max | 40 A | 40 A | 
| Current - Hold (Ih) (Max) | 5 A | 5 A | 
| Current - Trip (It) | 10 A | 10 A | 
| Time to Trip | 14.5 s | 14.5 s | 
| Resistance - Initial (Ri) (Min) | 10 mOhms | 10 mOhms | 
| Resistance - Post Trip (R1) (Max) | 50 mOhms | 50 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 | 0.551" L x 0.118" W (14.00mm x 3.00mm) | 0.551" L x 0.118" W (14.00mm x 3.00mm) | 
| Height - Seated (Max) | 1.008" (25.60mm) | 1.008" (25.60mm) | 
| Thickness (Max) | - | - | 
| Lead Spacing | 0.402" (10.20mm) | 0.402" (10.20mm) |