RT19 series of drum suitable for and exchange 50Hz by cap shape fuse box, specified voltages exchange 380,500V, specified electric currents at 125A in the distribution lines, It acts as and send distribution equipment, cable, wire overload and hold up and protect aM series blow and protect RT19 as motor For more details ,you can visit our website(www.sunzheng ) for a view. If you are interested in this item or other fuses ,please contact me , i will provide the suitable quality with the lowest price. Contact person: Miss Avaya lin