QHHR 50 Amp Automatic Transfer Switch for RV & Boats, 120/240 VAC, Pre-wired with Mechanical Interlock

QHHR 50 Amp Automatic Transfer Switch automatically and safely transfers 120/240 VAC between shore power and a generator or inverter to protect your RV or speedboat electrical system.

When you need seamless, code-conscious switching between two AC sources, this QHHR automatic transfer relay provides built-in mechanical interlocks and control circuitry so shore and generator power cannot feed the system at the same time. Pre-wired for quick installation and protected with a removable cover and wiring schematic, the unit is designed to simplify on-board electrical management while reducing the risk of backfeed and short circuits.

How does the QHHR transfer switch prevent both power sources from energizing the system at once?

The switch uses double protection: a mechanical interlock plus control-circuit logic that ensures only one source connects to the distribution board at any time. This layered approach lowers the chance of dangerous backfeed and electrical faults when switching between shore and generator or inverter power.

• Mechanical interlock physically blocks simultaneous connections.
• Control circuit sequencing enforces safe transfer logic.
• Pre-wiring reduces installation mistakes that could defeat protections.

What are the delay and wiring features that affect installation and operation?

The unit includes a selectable 30-second delay to prevent immediate re-transfer during momentary supply interruptions, and quick-connect terminals to streamline wiring. The removable protective cover houses a wiring schematic so installers can follow clear diagrams during setup or maintenance.

• Selectable 30-second delay minimizes nuisance transfers.
• Quick-connect terminals speed safe, organized wiring.
• Removable cover with schematic supports accurate installation and troubleshooting.

Will the switch work automatically with my generator or inverter?

Yes — this QHHR model is pre-wired to detect and automatically change the primary AC source from shore power to generator or inverter when the secondary source is activated. It handles 120/240 VAC at 50 amps, making it suitable for many RV and speedboat electrical systems that require high-current switching.

• Pre-wired changeover for automatic source selection.
• Rated for 50 amps and 120/240 VAC service.
• Compatible with typical shore, generator, and inverter setups used in RVs and boats.

What warranty and support does QHHR provide?

QHHR backs this transfer switch with a one-year warranty and customer support for any product problems. If you encounter installation or operational issues, the manufacturer encourages contacting them for help or warranty service.

• One-year limited warranty included.
• Manufacturer support for installation or performance questions.
• Clear labeling and schematic under the cover to aid service calls.

Who this product is for: Installers, RV owners, boaters, and electricians who need a reliable, code-conscious 50A automatic transfer solution for 120/240 VAC systems. Choose this switch if you want automatic source selection, built-in safety interlocks, a selectable transfer delay to avoid nuisance switching, and an accessible wiring schematic for straightforward installation and maintenance.