High Speed Fuses FWH Series: 250-800 Amps, 500 Volts Minimum Melting, Cut-Off Current Characteristics 103 102 FWH-300A FWH-400A FWH-500A FWH-600A FWH-800A Virtual Pre-Arcing Time In Seconds 101 100 10–1 10–2 10–3 10–4 102 0709 BU-SB09583 103 104 Prospective Current In Amps RMS Page 1 of 2 105 Data Sheet 360 Peak Let-Through, Cut-Off Current Characteristics 105 B Peak Let-Through Current 104 FWH-800A FWH-600A FWH-500A FWH-400A FWH-300A FWH-250A 103 A 102 102 103 104 Prospective Short-Circuit Current Symmetrical RMS 105 The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. © 2009 Cooper Bussmann St. Louis, MO 63178 www.cooperbussmann.com 0709 BU-SB09583 Page 2 of 2 Data Sheet 360