Finlandia FX503 Relay Contactor Box

The Finlandia FX503 Relay Contactor Box is an essential external power unit engineered to manage high electrical loads for large residential or commercial sauna systems. It serves as a safety bridge by isolating heavy currents from user-facing controls.

Core Technical Specifications

• Voltage & Phase: Configured explicitly for 208V, 3-phase electrical setups
• Heater Capacity: Intended for heavy-duty sauna heaters rated over 8kW (such as 9kW to 15kW Club models)
• Dimensions: Compact enclosure measuring 6″ W x 8″ H x 4″ D. It can be mounted anywhere outside the sauna room, using either surface or flush mounting
• Origin: Manufactured as an official OEM part in the USA

Compatibility Matrix

The FX503 contactor box must be paired with compatible Finlandia/Harvia components to operate correctly:

• Heater Models: Works seamlessly with Finlandia and Harvia Club series heaters (including Club 10, Club 12, and Club 15 models). It is also utilized for specific FIN series models requiring a 3-phase commercial-grade infrastructure
• Control Panels: Required when operating the above heaters with traditional analog F-2T (with a 60-minute timer) or F-2 (simple on/off) wall-mounted control panels