| Parameters | 
                                                                                                            
                                            | Mfr | Littelfuse Inc. | 
                                                                            
                                            | Series | PolySwitch®, RXEF | 
                                                                            
                                            | Package | Tape & Reel (TR) | 
                                                                            
                                            | Product Status | Active | 
                                                                            
                                            | Type | Polymeric | 
                                                                            
                                            | Voltage - Max | 72V | 
                                                                            
                                            | Current - Max | 40 A | 
                                                                            
                                            | Current - Hold (Ih) (Max) | 900 mA | 
                                                                            
                                            | Current - Trip (It) | 1.8 A | 
                                                                            
                                            | Time to Trip | 7.2 s | 
                                                                            
                                            | Resistance - Initial (Ri) (Min) | 200 mOhms | 
                                                                            
                                            | Resistance - Post Trip (R1) (Max) | 470 mOhms | 
                                                                            
                                            | Operating Temperature | -40°C ~ 85°C | 
                                                                            
                                            | Ratings | - | 
                                                                            
                                            | Mounting Type | Through Hole | 
                                                                            
                                            | Package / Case | Radial, Disc | 
                                                                            
                                            | Size / Dimension | 0.441" Dia x 0.118" T (11.20mm x 3.00mm) | 
                                                                            
                                            | Height - Seated (Max) | 0.622" (15.80mm) | 
                                                                            
                                            | Thickness (Max) | - | 
                                                                            
                                            | Lead Spacing | 0.199" (5.05mm) | 
                                                                            
                                            | Approval Agency | CQC, CSA, TUV, UL | 
                                                                            
                                            | RoHS Status | ROHS3 Compliant | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 1  (Unlimited) | 
                                                                            
                                            | REACH Status | REACH Unaffected | 
                                                                            
                                            | ECCN | EAR99 | 
                                                                            
                                            | HTSUS | 8533.40.8070 | 
                                                                            
                                            | Standard Package | 3,000 | 
                                                                                                    
                            
                         
                                                Polymeric PTC Resettable Fuse 72V 900 mA Ih Through Hole Radial, Disc