Introduction to Circuit Protection

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Table of Contents INTRODUCTION TO CIRCUIT PROTECTION Fuseology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11 Fuse Facts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4 Fuse selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6 Standrds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8 Packaging Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 PTC Facts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Overcurrent Selection Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Transientology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-23 Overvoltage Suppression Facts and Overvoltage Selection Guide . . . . . . . . . . . . . . . . . . . . . .11-21 ESD Suppressor Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 Overvoltage Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-23 VARISTOR PRODUCTS Varistor Products Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-26 TMOV ® and iTMOV ® High Surge Current Radial Lead, Thermally Protected Metal Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27-35 UltraMOV High Surge Current Radial Lead Metal Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . .36-47 C-III Series High Energy Radial Lead Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48-55 LA Series Radial Lead Metal-Oxide Varistors for Line Voltage Operation . . . . . . . . . . . . . . . . . . . .56-66 ZA Series Radial Lead Metal-Oxide Varistors for Low to Medium Voltage Operation . . . . . . . . . . .67-80 BA/BB Series Industrial High Energy Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81-85 DA/DB Series Industrial High Energy Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86-89 HA Series Industrial High Energy Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90-94 TMOV34S ® High Energy, Thermally Protected Metal Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . .95-100 HB34, HF34 and HG34 Series Industrial High Energy Metal-Oxide Varistor . . . . . . . . . . . . . . .101-108 DHB34 Series Industrial High Energy Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . .109-113 CA Series Industrial High Energy Metal-Oxide Disc Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . .114-121 NA Series Industrial High Energy Metal-Oxide Square Disc Varistor . . . . . . . . . . . . . . . . . . . . .122-126 MA Series Axial Lead Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127-131 PA Series Base Mount Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-136 RA Series Low Profile Metal-Oxide Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137-144 High Reliability Varistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145-154 SURFACE MOUNT VARISTORS Surface Mount Varistors Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156 MHS Series Multilayer High-Speed Surface Mount ESD Voltage Suppressor . . . . . . . . . . . . . .157-160 MLE Series Multilayer Surface Mount ESD Suppressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161-167 ML Series Multilayer Surface Mount Transient Voltage Surge Suppressor . . . . . . . . . . . . . . . .168-178 MLN SurgeArray Four Line Multilayer Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . .179-185 AUML Series Multilayer Surface Mount Automotive Transient Surge Suppressor . . . . . . . . . . .186-194 CH Series Monolithic Chip Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .195-199 PULSEGUARD ® PAGE RoHS Pb RoHS Pb RoHS Pb RoHS RoHS RoHS Pb Pb Pb SUPPRESSORS RoHS RoHS RoHS Pb Pb Pb PGB1 Series Lead-Free 0603, Single Line Surface Mount ESD Suppressor . . . . . . . . . . . . . . .202-203 PGB1 Series Lead-Free SOT23, Two Line Surface Mount ESD Suppressor . . . . . . . . . . . . . . .204-205 PGB1 Series Lead-Free 0805, Four Line Surface Mount ESD Suppressor . . . . . . . . . . . . . . . .206-207 PGB Series 0603, Single Line Surface Mount ESD Suppressor . . . . . . . . . . . . . . . . . . . . . . . .208-209 PGB Series SOT23, Two Line Surface Mount ESD Suppressor . . . . . . . . . . . . . . . . . . . . . . . . .210-211 PGB Series 0805, Four Line Surface Mount ESD Suppressor . . . . . . . . . . . . . . . . . . . . . . . . . .212-213 PGD Series Connector Array, Surface Mount ESD Suppressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . .214 TVS DIODE ARRAYS SPUSB1 Series, TVS Protection with Filter and Termination for USB Ports . . . . . . . . . . . . . . . .217-219 SP05x Series TVS Avalanche Diode Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220-227 SP720 Series High Voltage Rail Clamp SCR/Diode Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228-233 SP721 Series High Voltage Rail Clamp SCR/Diode Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . .234-239 SP723 Series High Voltage Rail Clamp SCR/Diode Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . .240-245 SP724 Series High Voltage Rail Clamp SCR/Diode Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . .246-251 SILICON AVALANCHE DIODES RoHS RoHS RoHS SMAJ Series, 400W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . .254-257 P4SMA Series, 400W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . .258-261 SMBJ Series, 600W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . .262-265 RoHS P6SMBJ Series, 600W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . .266-269 RoHS 1KSMBJ Series, 1000W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . .270-273 RoHS SMCJ Series, 1500W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . .274-277 RoHS 1.5SMC Series, 1500W Surface Mount Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . .278-281 RoHS P4KE Series, 400W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . . .282-285 RoHS SA Series, 500W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . . . . .286-289 RoHS P6KE Series, 600W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . . .290-293 RoHS 1.5KE Series, 1500W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . .294-297 RoHS 5KP Series, 5000W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . . .398-301 RoHS 15KP Cells, 15000W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . .302-304 RoHS SLD Series, Axial Leaded Transient Voltage Suppressor for Automotive Applications . . . . . . . .305-306 RoHS AK6 Series, 6000W Transient Voltage Suppressor for AC Line Protection . . . . . . . . . . . . . . . . .307-308 AK10 Series, 1000W Transient Voltage Suppressor for AC Line Protection . . . . . . . . . . . . . . . .309-310 RoHS www.littelfuse.com
Table of Contents SWITCHING GAS DISCHARGE TUBES LCE Series, 1500W Axial Leaded Transient Voltage Suppressor . . . . . . . . . . . . . . . . . . . . . . . .311-314 LT Series, Voltage Switch Designed for HID Lighting Systems . . . . . . . . . . . . . . . . . . . . . . . . . .316-317 VS Series, Voltage Switch Designed for Fuel Ignition Circuits . . . . . . . . . . . . . . . . . . . . . . . . . .318-319 XT Series, Voltage Switch Designed for Xenon HID Circuits in Automobiles . . . . . . . . . . . . . . .320-321 GAS DISCHARGE TUBES GreentubeBroadband Optimized SL1002 Minitube Series . . . . . . . . . . . . . . . . . . . . . . . . . .323-325 Greentube SL1003 Minitube Series, 3 Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .326-328 Greentube SL1011A Medium Duty Arrester Series, 2 Terminal . . . . . . . . . . . . . . . . . . . . . . . .329-331 Greentube SL1011B Heavy Duty Arrester Series, 2 Terminal . . . . . . . . . . . . . . . . . . . . . . . . . .332-334 Greentube SL1021A Medium Duty Arrester Series, 3 Terminal 8.0mm diameter . . . . . . . . . . .335-337 Greentube SL1021B Heavy Duty Arrester Series, 3 Terminal 8.0mm diameter . . . . . . . . . . . .338-340 Greentube SL1024A Medium Duty Arrester Series, 3 Terminal 8.0mm diameter . . . . . . . . . . .341-343 Greentube SL1024B Heavy Duty Arrester Series, 3 Terminal 8.0mm diameter . . . . . . . . . . . .344-346 Greentube SL1122A Hybrid Arrester Series, 3 Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .347-348 Greentube SL1026 Maximum Duty Arrester Series, 3 Terminal . . . . . . . . . . . . . . . . . . . . . . . .349-350 Greentube HV Series High Voltage Arrester, 2 Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .351-352 RESETTABLE PTCs 1206L Series 1206 Surface Mount Resettable PTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .354-355 1812L Series 1812 Surface Mount Resettable PTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .356-357 30R Series 30 Volt Radial Lead Resettable PTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .358-359 60R Series 60 Volt Radial Lead Resettable PTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .360-361 SURFACE MOUNT FUSES 466 Series, SlimLine Lead-Free 1206, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . .364-365 433 Series, SlimLine 1206, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .366 429 Series, High Current Lead-Free 1206, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . .367 468 Series, SlimLine Lead-Free 1206, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .368 430 Series, 1206, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .369 467 Series, SlimLine Lead-Free 0603, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . .370-371 434 Series, SlimLine 0603, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .372 435 Series, SlimLine Lead-Free 0402, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . .373 451/453 Series, NANO2® Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .374 452/454 Series, NANO2® Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .375 455 Series, NANO2® UMF Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .376 154 Series, SMF OMNI-BLOK ® Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .377 464 Series, NANO2® 250V UMF Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .378 465 Series, NANO2® 250V UMF Time Lag Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .379 461 Series, TeleLink ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .380-382 459/460 Series, PICO ® SMF Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .383 202 Series, FLAT-PAK ® Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .384 203 Series, FLAT-PAK ® Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .385 446/447 Series, EBF Fuse Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .386 AXIAL LEAD & 251/253 Series, PICO ® II, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .388 CARTRIDGE FUSES 263 Series, PICO ® II 250 Volt, Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .389 471 Series, PICO ® II, Time Lag Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .390 473, Series, PICO ® II, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .391 265/266/267 Series, PICO ® , Very Fast-Acting Fuse (High-Reliability) . . . . . . . . . . . . . . . . . . . . . . . .392 262/268/269 Series, MICRO Very Fast-Acting Fuse (High-Reliability) . . . . . . . . . . . . . . . . . . . . . . .393 272/273/274/278*279 Series, MICRO Very Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . .394 2AG, Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .395-396 2AG, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .397-398, 399-400 3AG Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-402 3AG, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .403-404 3AB, Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .405-406 3AB, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407-408 5 x 20 mm, Medium-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .409-410, 422-423, 426-427, 428-429 5 x 20 mm, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . .411-412, 413-414, 417-418, 419, 420-421 5 x 20 mm, Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .415-416, 424-425 3.6 X 10 mm, Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .432, 434, 436 3.6 X 10 mm, Slo-Blo ® Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .433, 435, 437 322 Series, 3AB, Very Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .438 322P Series, 3AB, Very Fast-Acting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .439 662 Series, LT-5, Fast-Acting- for New Designs use the Wickmann 370 series TR5 ® fuse . . . . . . . . . . . 663 Series, LT-5, Time Lag Fuse- for New Designs use the Wickmann 372 series TR5 ® fuse . . . . . . . . 664 Series, LT-5, Time Lag Extended Breaking Capacity- for New Designs use the Wickmann 382 series TR5 ® fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 665 Series, LT-5, Time Lag- for New Designs use the Wickmann 374 series TR5 ® RoHS PAGE RoHS RoHS RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS RoHS Pb RoHS RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS RoHS RoHS RoHS RoHS RoHS RoHS RoHS RoHS RoHS RoHS RoHS RoHS Pb RoHS RoHS RoHS RoHS RoHS Pb Pb Pb Pb Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb RoHS Pb fuse . . . . . . . . . . . . . KLK Series, AC, Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .440 KLKD Series, DC, Fast-Acting Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .441 www.littelfuse.com
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