| Parameters | 
                                                                                                            
                                            | Mfr | Littelfuse Inc. | 
                                                                            
                                            | Series | POLY-FUSE®, 250R | 
                                                                            
                                            | Package | Tape & Box (TB) | 
                                                                            
                                            | Product Status | Obsolete | 
                                                                            
                                            | Type | Polymeric | 
                                                                            
                                            | Voltage - Max | 60V (250V Int) | 
                                                                            
                                            | Current - Max | 3 A | 
                                                                            
                                            | Current - Hold (Ih) (Max) | 120 mA | 
                                                                            
                                            | Current - Trip (It) | 240 mA | 
                                                                            
                                            | Time to Trip | 2.5 s | 
                                                                            
                                            | Resistance - Initial (Ri) (Min) | 6 Ohms | 
                                                                            
                                            | Resistance - Post Trip (R1) (Max) | 16 Ohms | 
                                                                            
                                            | Operating Temperature | -40°C ~ 85°C | 
                                                                            
                                            | Ratings | - | 
                                                                            
                                            | Mounting Type | Through Hole | 
                                                                            
                                            | Package / Case | Radial, Disc | 
                                                                            
                                            | Size / Dimension | 0.256" L x 0.181" W (6.50mm x 4.60mm) | 
                                                                            
                                            | Height - Seated (Max) | 0.433" (11.00mm) | 
                                                                            
                                            | Thickness (Max) | - | 
                                                                            
                                            | Lead Spacing | 0.201" (5.10mm) | 
                                                                            
                                            | Approval Agency | cURus, TUV | 
                                                                            
                                            | RoHS Status | ROHS3 Compliant | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 1  (Unlimited) | 
                                                                            
                                            | ECCN | EAR99 | 
                                                                            
                                            | HTSUS | 8533.40.8070 | 
                                                                            
                                            | Other Names | -250R120-R1ZR | 
                                                                            
                                            | Standard Package | 1,200 | 
                                                                                                    
                            
                         
                                                Polymeric PTC Resettable Fuse 60V (250V Int) 120 mA Ih Through Hole Radial, Disc