The 53278 is a military SPST, solid-state relay. It is a lightweight device resistant to damage from shock and vibration, and immune to contact-related problems (contamination, arcing) associated with mechanical equivalents. Transformer coupling between the input and output stages provides effective isolation up to 1000 V RMS. The Power FET output eliminates bipolar offset and minimizes output voltage drop. The preferred control input is CMOS compatible operating from a bias supply of 4.5 to 5.5VDC. (See Figure 1) Integral short-circuit protection, I2T trip and status output is provided. This unit is Pin configurable for 1A or 2A output. The output current flow is sensed while under load or while switching, and responds to an over-current with an I2T trip curve by opening the output. An open-collector Status is available to indicate the switch state. The output will remain blocked indefinitely until the short is removed and the unit reset. This feature prevents damage to the controller and also averts further system failures that may be caused by the short circuit. Output Status is On (High) when the output is switched on and is Off (Low) whenever the output is commanded off or tripped. Resetting the unit is accomplished by recycling the input control.