special purpose fuses 92 w w w . l i t t e l f u s e . c o m special purpose fuses ? 2005 littelfuse ? powr-gard ? products catalog la 50 qs 250 -4 style littelfuse ampere rating mounting type (blades/bolt-in) voltage (500) la50qs semiconductor fuses 500 vac ? very fast acting ? 35 C 1200 amperes specifications voltage rating: ac: 500 volts dc: 500 volts interrupting rating: ac: 200,000 amperes dc: 100,000 amperes ampere range: 35 C 1200 amperes approvals: ul recognized under the components program csa certified. in response to new equipment requirements, littelfuse la50qs series fuses were developed to improve the overall performance of semiconductor fuses. the la50qs provides the best protection features including lower i 2 t, longer life when subjected to cyclic loading and lower watts loss. la50qs is todays choice for the protection of dynamic solid state equipment. features ? lowest i 2 t for greatest protection of semiconductor circuits. ? low watts loss for cooler operation. ? superior cycling ability gives an equipment design advantage. ? state-of-the-art protection for 500 volt equipment. ? ultra compact sizes allow down-sizing of existing equipment. applications protection of 500 volts or less solid state equipment such as motor drives, ups, inverters, etc. ordering information
special purpose fuses 93 w w w . l i t t e l f u s e . c o m special purpose fuses ? 2005 littelfuse ? powr-gard ? products catalog la50qs semiconductor fuses 500 vac ? very fast acting ? 35 C 1200 amperes ampere rating littelfuse catalog number mounting type maximum clearing i 2 t @500 vac (a 2 s x 10 3 ) watts loss @ rated current (w) 35 la50qs35-4 4 0.56 6 40 la50qs40-4 4 0.69 7 50 la50qs50-4 4 1.1 8 60 la50qs60-4 4 1.8 10 70 la50qs70-4 4 1.9 12 80 la50qs80-4 4 2.6 14 90 la50qs90-4 4 3.6 15 100 la50qs100-4 4 4.4 17 125 la50qs125-4 4 5.6 21 150 la50qs150-4 4 9 25 175 la50qs175-4 4 15 29 200 la50qs200-4 4 20 33 225 la50qs225-4 4 25 37 catalog numbers & technical data ampere rating littelfuse catalog number mounting type maximum clearing i 2 t @500 vac (a 2 s x 10 3 ) watts loss @ rated current (w) 250 la50qs250-4 4 29 41 300 la50qs300-4 4 55 49 350 LA50QS350-4 4 88 57 400 la50qs400-4 4 98 65 450 la50qs450-4 4 130 69 500 la50qs500-4 4 160 77 600 la50qs600-4 4 220 92 700 la50qs700-4 4 270 110 800 la50qs800-4 4 360 130 900 la50qs900-4 4 500 140 1000 la50qs1000-4 4 560 160 1200 la50qs1200-4 4 930 175 dimensions dimensions for reference only. amperes mount. type dimensions in inches (mm in parentheses) a b c d e f g h 35 C 100 4 3.63 (92.2) 1.00 (25.4) 2.13 (54.1) 2.94 (74.7) 2.75 (69.9) 0.31 (7.9) 0.75 (19.1) 0.13 (3.3) 125 C 200 4 3.63 (92.2) 1.22 (31.0) 2.13 (54.1) 2.94 (74.7) 2.81 (71.4) 0.31 (7.9) 1.00 (25.4) 0.19 (4.8) 225 C 400 4 4.34 (110) 1.50 (38.1) 2.09 (53.1) 3.41 (86.6) 2.78 (70.6) 0.41 (10.4) 1.00 (25.4) 0.25 (6.4) 450 C 600 4 4.47 (114) 2.00 (50.8) 2.22 (56.4) 3.53 (89.7) 2.91 (73.9) 0.41 (10.4) 1.50 (38.1) 0.25 (6.4) 700 C 800 4 6.47 (164.3) 2.50 (63.5) 2.22 (56.4) 5.00 (127.0) 3.44 (87.3) 0.53 (13.5) 1.50 (38.1) 0.25 (6.4) 900 C 1200 4 6.97 (177.0) 3.00 (76.2) 3.22 (81.8) 5.47 (138.9) 4.47 (113.5) 0.63 (15.9) 2.38 (60.3) 0.44 (11.1) contact littelfuse for characteristic curves.
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