Siemens PAD-4-MB NAC Expander Replacement BoardThe Siemens PAD 4 MB is the factory replacement control board used in all PAD 4 distributed power supplies and NAC expander kits. Swapping in this board restores the PAD 4s four supervised output circuits, two trigger inputs, on board battery charger, strobe sync generator, ANSI Temporal coding, status LEDs, and dual trouble relays without replacing the entire cabinet or power supply.
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