The Balboa VS511SZ Expander Board 53426, is the 2-speed pump circuit that connects to the main circuit board. This board is specifically used on the VS511Z and VS511SZ Model Spa Controllers and is not compatible with any other Balboa spa controllers or power packs.
This expander board is also a replacement compatible replacement for the following part numbers:
- 3-60-0099,
- 59-138-1820,
- 053426
- 10-175-3426
- 53913 (if the original removable cables are going to be re-used)
