Hydroquip 33-55137-k Spa Expander Board Dual Relay

Product Description

The HYDROQUIP 33-55137-k is a printed circuit board expander designed for spa and hot tub control systems operating within the Balboa VS EL BP Series platform. This dual-relay expander board includes an integrated fuse and extends the output capacity of a compatible main control board, allowing additional pump speeds or accessory circuits to be managed from the same system. Pool and spa service technicians install this board as a direct replacement when the original expander has failed, is damaged, or is causing unreliable relay switching. At 0.51 pounds, it is a compact, low-profile PCB suited for standard spa equipment compartments.

This expander board is used in residential spa and hot tub applications where the control system requires additional relay outputs beyond what the primary board provides. It is appropriate for installations using the Balboa VS EL BP Series control system and is typically found in above-ground and in-ground hot tubs requiring a 2-speed pump configuration or secondary accessory control. The alternate part number 33-0029C-K is associated with this same board and may appear in older service records or equipment documentation.

Key Features

• Dual-relay configuration expands output capacity for multi-speed or accessory control
• Integrated fuse provides overcurrent protection at the board level
• Designed as a direct PCB replacement for the Balboa VS EL BP Series expander position
• Compact and lightweight at 0.51 pounds for fit in standard spa equipment bays
• Associated alternate part number 33-0029C-K for cross-reference in service records

Compatibility

Designed for use with the Balboa VS EL BP Series spa control platform. Alternate part number 33-0029C-K cross-references to this board. No additional compatible model numbers were specified in the product data.

Installation Notes

Installation should be performed by a licensed electrician or qualified pool and spa service technician. Disconnect all power to the spa at the GFCI disconnect before removing or installing any circuit board. Handle the PCB by its edges to avoid electrostatic discharge damage to onboard components. Verify the replacement board matches the relay count and fuse rating of the original before powering the system back on.

Technical Specifications

• Weight: 0.51 pounds
• Board Type: Dual Relay Expander with Fuse
• Series Compatibility: Balboa VS EL BP Series

Standard Information

• Brand: HYDROQUIP
• Manufacturer Part Number: 33-55137-k