Finnleo CB16-1 Contactor Box (1-phase)

Finnleo CB16-1 Contactor Box – 1-Phase (240V)

What the CB16-1 Contactor Box Does

The Finnleo CB16-1 is a 240-volt, single-phase contactor box engineered to work exclusively with SaunaLogic2® (SL2) digital controls. It serves as the critical electrical relay between your home's line-voltage power supply and your sauna heater, safely switching the high-voltage, high-amperage heater load on and off in response to low-voltage signal commands sent from the SL2 touchscreen control. Because SaunaLogic2 controls are engineered to operate on low-voltage, low-current signal wiring for user safety, a contactor box such as the CB16-1 is required at the heater to perform the actual line-voltage switching. This is not optional or aftermarket hardware — it is a mandatory, factory-specified companion component for any SaunaLogic2-controlled heater running on a 240V single-phase electrical service, and every SL2 heater installation is built around a correctly matched contactor box.

Heater Compatibility & Electrical Sizing

The CB16-1 is engineered and rated specifically for Finnleo's 240V single-phase heater lineup controlled by SaunaLogic2, including the Designer SL2 heater series and the Himalaya heater series, as well as compatible 240V single-phase Junior-format heaters. Contactor boxes in the Finnleo SaunaLogic2 lineup are organized by amperage and phase capacity — the CB16-1 covers the lower-to-mid kW range of single-phase heaters, while heaters with higher electrical draw, three-phase service, or larger cabin volumes are matched instead to the CB17 or CB18 contactor boxes. Selecting the correct box depends on your heater's exact kW rating, voltage, phase, and breaker size; the CB16-1 is not interchangeable with three-phase wiring configurations or with heaters exceeding its rated switching capacity. Because an undersized or mismatched contactor box can affect heater performance, create nuisance tripping, or void safety compliance, confirming your heater model and full electrical service details before ordering is essential.

Construction & Installation

The CB16-1 is housed in a compact, wall-mountable metal enclosure (approximately 12"W x 4"D x 8"H) built for placement in the sauna's mechanical space, typically near or behind the heater and outside the bather's reach or direct line of sight. Internally, the enclosure houses the contactor relay hardware that bridges three connection points: the incoming dedicated branch circuit from the home's electrical panel, the low-voltage control leads from the SaunaLogic2 control unit, and the outgoing power leads to the heater itself. Wiring must follow the specific diagram provided in the Finnleo/SaunaLogic2 installation manual for the heater model being installed, and installation should always be performed by a licensed electrician in accordance with local and national electrical codes. The metal housing is designed to withstand the elevated ambient heat and humidity typical of the mechanical space surrounding a sauna heater, ensuring long-term reliable switching performance session after session.

Why This Component Matters

Without a correctly sized contactor box, a SaunaLogic2 control cannot safely or legally operate a 240V sauna heater. The CB16-1 is the piece of hardware that translates the SL2 touchscreen's low-voltage digital commands into real, line-voltage heater power switching — the mechanical link that makes every feature of the SaunaLogic2 ecosystem possible, including temperature regulation, session scheduling, 24-hour delay or 60-minute timer functions, and Wi-Fi/app-based remote start. In short, the CB16-1 is what allows the sleek glass touchscreen experience to actually control real heater hardware safely. Ordering the correct contactor box the first time, matched precisely to your heater's kW and phase, avoids installation delays, failed inspections, and costly rework down the line.

Why Choose Finnleo

Finnleo, built by Sauna360 in Cokato, Minnesota, is one of the most trusted names in authentic Finnish sauna manufacturing in North America. Every heater, control, and supporting electrical component — including the CB16-1 contactor box — is safety-tested and listed for use in the U.S. and Canada, giving installers and homeowners confidence in code compliance and long-term reliability. As an authorized Finnleo dealer, we offer full factory warranty coverage, expert sizing help matched to your exact heater and electrical service, and support before and after your purchase. Not sure whether the CB16-1 is the right contactor box for your heater and electrical service? Send us your heater model, kW rating, and voltage/phase information and we'll confirm the exact pairing before you order, so your installation goes smoothly the first time.