1794-OA16:
Module outputs are not fused. Fusing is recommended. If fusing is desired, you must supply external fusing (1.6 A, 250V AC slow-blow) or use the 1794-TBNF terminal base, if recommended.
1794-OB16P:
The output current is electronically limited to 1.5A and thermally reacts to the short circuit by removing power to the circuit. When the temperature of the transistor is greater than 150C, the transistor will turn off which in turn will turn off the output point. When the transistor cools to 130C, it will turn on again. This also reduces heat, allowing a longer, controlled surge current.