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| Part Number | TRF250-110U-2 | TRF250-120U-2 | 
|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. | 
| Product Status | Obsolete | Active | 
| Type | Polymeric | Polymeric | 
| Voltage - Max | 60V (250V Int) | 60V (250V Int) | 
| Current - Max | 3 A | 3 A | 
| Current - Hold (Ih) (Max) | 110 mA | 120 mA | 
| Current - Trip (It) | 220 mA | 240 mA | 
| Time to Trip | 1.2 s | 1 s | 
| Resistance - Initial (Ri) (Min) | 5 Ohms | 6 Ohms | 
| Resistance - Post Trip (R1) (Max) | 16 Ohms | 16 Ohms | 
| 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 | 0.209" Dia x 0.150" T (5.30mm x 3.80mm) | 0.236" L x 0.150" W (6.00mm x 3.80mm) | 
| Height - Seated (Max) | 0.370" (9.40mm) | 0.394" (10.00mm) | 
| Thickness (Max) | - | - | 
| Lead Spacing | 0.197" (5.00mm) | 0.197" (5.00mm) |