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Utilizing a signal from transistor transistor logic (TTL) circuits, the integrated power switch (IPS) can control 40 kW. Protection against overload conditions enables the use of transistors which have ideal switching characteristics. Each half-section of the IPS is electrically isolated from the signal input using optical couplers. Discrete component assemblies, printed-circuit boards, thick-film or medium-scale integrated substrates each have been utilized. The forced-air-cooled heat sink was designed for maximum cooling. Two types of IPS's were initially constructed: 500 V/60 A, and 100 V/200 A, with additional availability of 500 V/100 A devices in small quantity. Its capability to work from continuous operation to 10 kHz makes the IPS universally applicable to most power-conversion applications with-in its current and voltage limitation.