This solid-state switch senses and interrupts an overcurrent condition within 2 /is. II allows the circuit to float. IC
1 runs at 150 kHz and full-wave doubler D1/D2 provides 15 V to the gate of Ql. An overcurrent sensed across Rl triggers Q3, removes gate bias from Ql, and opens the circuit formed by the full-wave bridge and Ql. CI and R3 allow the circuit to handle surges.