High Current Fuses MEGA High Performance Fuse Rated 70V-SF51 The MEGA 70V-SF51 High Performance (HP) Fuse is designed for high current circuit protection up to 500A with Diffusion Pill Technology. The MEGA 70V HP features 1MOhm Open State Resistance after fuse opening to guarantee safe interruption at any voltage up to 70V. The MEGA 70V HP Fuse is ideal for battery and alternator protection application and other heavy gauge cables requiring ultra-high current protection. MEGA 70V HP Fuse-SF51 Specifications Interrupting Rating: 2500A 70 VDC Voltage Rating: 70 VDC Operating Temperature Range: -40C to + 125C Housing Material: PPA-GF33 Terminals: ETP Copper (Tin plated) Mounting Torque M6: 9Nm+/-1Nm Mounting Torque M8: 20Nm+/-1Nm COLOR CODING Open State Resistance (after fuse opening) >1MOhm SEE CHART According to: ISO 20934 - Type SF51 Time-Current Characteristic Curves TIMECURRENTCHARACTERISTICCURVES(RECORDED 23C) 10000 Ordering Information Time-Current Characteristics Package Bolt Bolt Part Number Rating Opening Time Min / Max (s) % of Size Size Hole Qty 1000 Rating 0998xxx.UX-2M8 500 60 - 500 M8 2 60-250A 300A 350-500A 0998xxx.UX-1M8 500 60 - 500 M8 1 75 -/- 14,400 s / - 14,400 s / - 100 0998xxx.UX-2M6 500 60 - 500 M6 2 100 14,400 s / - -/- -/- 0998xxx.UX-1M6 500 60 - 500 M6 1 135 120 s / 1800 s 120 s / 1800 s -/- 0998xxx.UX-NH 500 60 - 500 N/A 0 150 20 s / 450 s 20 s / 450 s -/- 10 Dimensions 200 1 s / 15 s 1 s / 15 s 1 s / 15 s Dimensions in mm 350 0.3 s / 5 s 0.3 s / 5 s 0.500 s / 5 s 1 600 0.100 s / 1 s 0.100 s / 1 s 0.100 s / 1 s 68.60 50.80 29.2 0,1 0,01 10 100 1000 10000 CURRENT A 8.6 TIMECURRENTCHARACTERISTICCURVES(RECORDED 23C) or 6.6 10000 Ratings Current Rated Voltage Voltage Drop 2 2 2 Part Number Font Color Wire (mm ) I t (A s) Rating (A) (V) (mV) max. 0998060. 60 70 110 6 22800 1000 0998080. 80 70 110 10 34900 0998100. 100 70 110 10 24000 0998125. 125 70 110 16 38000 100 0998150. 150 70 110 25 58100 0998175. 175 70 110 25 79300 10 0998200. 200 70 110 35 123600 0998225. 225 70 110 35 142500 0998250. 250 70 110 50 220000 1 0998300. 300 70 80 50 340000 0998350. 350 70 80 50 495000 0998400. 400 70 80 70 872000 0,1 0998450. 450 70 80 70 1224000 100 1000 10000 CURRENT A 0998500. 500 70 80 70 1800000 Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. TIME s TIME s 60A 350A 80A 400A 100A 125A 450A 150A 500A 175A 200A 225A 250A 300A 19.05 16.25 1.0 9.9High Current Fuses MEGA High Performance Fuse Rated 70V-SF51 Typical Derating Of Fuse Melting Element Temperature Security Margin is 20% Wire Cross Sections And Test Fixture acc. ISO 20934 Temperature Table max. allowed current load A at ambient temperature -20C 0C 20C 65C 85C 95C 105C 125C 60A 60 60 60 52 46 44 41 34 80A 80 79 74 63 57 54 50 43 100A 100 100 99 83 75 70 66 55 125A 125 125 119 100 90 85 79 66 150A 150 150 141 118 107 100 94 78 175A 168 159 149 126 113 107 100 84 200A 195 185 174 147 133 125 117 98 225A 217 205 193 162 146 137 128 107 250A 250 240 227 192 175 165 155 132 300A 287 272 256 216 195 184 172 145 350A 293 278 262 221 200 188 176 148 400A 330 313 295 248 225 212 198 167 450A 347 329 310 261 236 222 208 175 500A 361 342 322 271 245 231 216 181 Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.