HVO Relay Box


SKU: relay-box-kit Category:


The Relay Box is a multi-outlet power switch that is designed exclusively for use with HVO systems. It enables the attached oxygen concentrators to be automatically switched on and off via a signal sent over a coaxial cable from the HVO Main unit.

Available in 3-outlet and 5-outlet standard models, for both US (110-120V) and EU (220-240V) power. Each relay box is outfitted with two coaxial connectors intended for “daisy-chaining” HVO components together. In addition to the relay box itself, the kit includes a 6 ft / 1.8 m coaxial cable.

See also the 5-outlet Smart Relay Box.

NOTES:  For the 3-outlet relay box, a permanently attached machine cord is included with a NEMA 5-20 plug, for 120V/20A power. The 5-outlet relay box also has a permanently attached cord, but the plug type is NEMA L5-30P, for 120V/30A power.


A typical 10 LPM oxygen concentrator is rated at 600 watts. A fully-populated 3-Outlet Relay Box will consume 1800 watts, whereas a fully populated 5-Outlet Relay Box will consume 3000 watts.

For US 120V power, this equates to the need for a dedicated 20 amp circuit for each 3-Outlet Relay Box, and 30 amps for a 5-Outlet Relay Box. For 220-240 volt power, that would be 10 amps and 15 amps, respectively.

All Relay Boxes have a built-in breaker with push-button reset.

CANCELED ORDERS: If you make a purchase and subsequently cancel, a 5% restocking fee will apply.

Additional information

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