Renogy 120V 30 Amp Automatic Transfer Switch for Off-Grid Systems

The Renogy 120V 30 Amp Automatic Transfer Switch is a relay-based switching unit rated for 30A at 120VAC/60Hz, designed to automatically shift between two power sources in off-grid, RV, van, and cabin electrical systems. The ABS shell houses a built-in 20–30 second time delay to protect connected loads during source transitions. One unit is included per order.

Automatic Switching Without Manual Intervention

When grid power fails or a generator comes online, the Renogy 30 Amp Transfer Switch detects the change and shifts the load automatically using its internal relay. The built-in 20–30 second time delay prevents rapid cycling between sources, which can stress inverters, generators, and sensitive electronics. For an overlanding rig or cabin where power transitions happen without anyone watching the panel, that automatic handoff means connected loads keep running without a manual flip of a breaker or switch.

Rated for Real Loads at 30 Amps

At 30A continuous and 120VAC, this transfer switch covers the shore-power or generator circuits common in RV and van builds. That rating provides enough headroom for a converter charger, air conditioner circuit, or a bank of outlets feeding camp equipment. The 3000A RMS symmetrical fault current rating indicates the switch is built to handle the short-circuit currents that can appear in properly protected residential and RV-grade panels, not just steady-state loads.

Straightforward Panel Integration

The 8 × 8 × 3 inch ABS enclosure provides four M5 mounting points and ten 0.91-inch knockout holes for conduit or cable entry, so the switch can be surface-mounted in a van electrical cabinet, a trailer utility bay, or a cabin sub-panel without custom fabrication. Relay and ground bar cables in the 6–14 AWG range are supported, covering the wire gauges typical of 30A branch circuits. Installation requires a qualified electrician and must follow local electrical safety codes.

Features

• Relay-based automatic switching: transfers load between two 120VAC sources with no manual intervention
• Built-in time delay: 20–30 second relay delay prevents rapid source cycling
• 30A / 120VAC / 60Hz rating: sized for standard RV and residential branch circuits
• 3000A RMS symmetrical fault current rating: compatible with properly protected panels
• 10 knockout holes (0.91 inch): flexible conduit and cable routing options
• ABS enclosure with 4 × M5 mounting points: surface-mountable in cabinets or utility bays

Specifications

Who This Is For and Isn't

The Renogy 120V 30 Amp Automatic Transfer Switch suits builders of RV, van, trailer, and off-grid cabin electrical systems who need automatic source switching between shore power, a generator, or an inverter on a 120VAC/60Hz, 30A branch circuit. Installation must be performed by a qualified electrician in accordance with local electrical safety codes.

This switch is rated for 120VAC/60Hz only and is not suitable for 240V, 50A, or DC applications. It does not include wiring, conduit, a sub-panel, or any additional electrical components; those must be sourced separately. It is not a surge protector or a UPS.

Common Questions

How do I choose the right transfer switch amperage for my system?

Selecting the correct transfer switch starts with identifying the maximum current draw of all devices that will run on the circuit simultaneously. The Renogy 30 Amp Transfer Switch is rated for 30A at 120VAC/60Hz; if the combined load of connected devices exceeds 30A, a higher-rated switch is required. Verify that the input voltage of your power sources matches 120VAC/60Hz before installation.

Does this transfer switch require a licensed electrician to install?

Yes. The Renogy 120V 30 Amp Automatic Transfer Switch involves line-voltage AC connections and must be installed by a qualified electrician following local electrical safety codes and standards. Before installation, confirm the power and current ratings of all connected devices do not exceed the switch's 30A maximum to avoid overloading the circuit.

What wire gauges are compatible with this transfer switch?

The Renogy 30 Amp Transfer Switch supports 6–14 AWG cables for the relay and ground bar connections. Use cables or conduits of appropriate size for any reserved wiring holes. Consult the product manual's wiring diagram and disconnect all power before making any connections.

What should I do if the transfer switch fails or shows sparks or smoke?

If the Renogy 30 Amp Transfer Switch shows signs of failure (including sparks or smoke), immediately turn off the switch and disconnect the power supply. Do not attempt self-repair. Contact a qualified electrician for inspection; possible causes include poor wiring, overload, or internal failure. Do not restore power until a professional has assessed the unit.