Microswitches systems are adapted to the following Mersen fuses only: • PSC sizes 30, 31, 32, 33 • PSC sizes 2x32, 2x33 • PSC sizes 70, 71, 72, 73 • PSC sizes 2x72, 2x73 (except plain blades) • PSC LR sizes 33, 2x33, 73, 2x73 Warning: microswitch systems exclusively designed for Protistor® fuses, fitted with a patented trip-indicator, saving use of EDV.