Special Purpose Fuses LA50QS Semiconductor Fuses 500 VAC • Very Fast Acting • 35 – 1200 Amperes 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 I2t, longer life when subjected to cyclic loading and lower watts loss. LA50QS is today’s choice for the protection of dynamic solid state equipment. Features • • • • • Lowest I2t 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 LA 50 QS 250 -4 Special Purpose Fuses Littelfuse Voltage (500) Style Ampere Rating Mounting Type (Blades/Bolt-in) Specifications Voltage Rating: Interrupting Rating: Ampere Range: Approvals: 92 www.littelfuse.com AC: 500 volts DC: 500 volts AC: 200,000 Amperes DC: 100,000 Amperes 35 – 1200 Amperes UL Recognized under the components program CSA Certified. © 2005 Littelfuse • POWR-GARD™ Products Catalog Special Purpose Fuses LA50QS Semiconductor Fuses 500 VAC • Very Fast Acting • 35 – 1200 Amperes Catalog Numbers & Technical Data Ampere Rating Littelfuse Catalog Number 35 40 50 60 70 80 90 100 125 150 175 200 225 LA50QS35-4 LA50QS40-4 LA50QS50-4 LA50QS60-4 LA50QS70-4 LA50QS80-4 LA50QS90-4 LA50QS100-4 LA50QS125-4 LA50QS150-4 LA50QS175-4 LA50QS200-4 LA50QS225-4 Maximum Mounting Clearing I2 t @500 Type VAC (A 2S x 10 3) 4 4 4 4 4 4 4 4 4 4 4 4 4 0.56 0.69 1.1 1.8 1.9 2.6 3.6 4.4 5.6 9 15 20 25 Watts Loss @ Rated Current (W) 6 7 8 10 12 14 15 17 21 25 29 33 37 Ampere Rating Littelfuse Catalog Number 250 300 350 400 450 500 600 700 800 900 1000 1200 LA50QS250-4 LA50QS300-4 LA50QS350-4 LA50QS400-4 LA50QS450-4 LA50QS500-4 LA50QS600-4 LA50QS700-4 LA50QS800-4 LA50QS900-4 LA50QS1000-4 LA50QS1200-4 Maximum Mounting Clearing I2 t @500 Type VAC (A 2S x 10 3) 4 4 4 4 4 4 4 4 4 4 4 4 29 55 88 98 130 160 220 270 360 500 560 930 Watts Loss @ Rated Current (W) 41 49 57 65 69 77 92 110 130 140 160 175 Special Purpose Fuses Dimensions Dimensions for reference only. Amperes Mount. Type 35 – 100 4 125 – 200 4 225 – 400 4 450 – 600 4 700 – 800 4 900 – 1200 4 Dimensions in Inches (mm in parentheses) A 3.63 (92.2) 3.63 (92.2) 4.34 (110) 4.47 (114) 6.47 (164.3) 6.97 (177.0) B 1.00 (25.4) 1.22 (31.0) 1.50 (38.1) 2.00 (50.8) 2.50 (63.5) 3.00 (76.2) C 2.13 (54.1) 2.13 (54.1) 2.09 (53.1) 2.22 (56.4) 2.22 (56.4) 3.22 (81.8) D 2.94 (74.7) 2.94 (74.7) 3.41 (86.6) 3.53 (89.7) 5.00 (127.0) 5.47 (138.9) E 2.75 (69.9) 2.81 (71.4) 2.78 (70.6) 2.91 (73.9) 3.44 (87.3) 4.47 (113.5) F 0.31 (7.9) 0.31 (7.9) 0.41 (10.4) 0.41 (10.4) 0.53 (13.5) 0.63 (15.9) G 0.75 (19.1) 1.00 (25.4) 1.00 (25.4) 1.50 (38.1) 1.50 (38.1) 2.38 (60.3) H 0.13 (3.3) 0.19 (4.8) 0.25 (6.4) 0.25 (6.4) 0.25 (6.4) 0.44 (11.1) Contact Littelfuse for characteristic curves. © 2005 Littelfuse • POWR-GARD™ Products Catalog www.littelfuse.com 93