The ABB DD370A is a diode module used in the ABB Procontrol P13 automation system. It is a component that helps to convert AC power to DC power, which is necessary for many electronic devices. The DD370A is a relatively small module, measuring about 4 inches by 2 inches by 1 inch. It has a black plastic housing with a metal heat sink on top. The module has four terminals: two for the AC input, and two for the DC output.

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