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Generator transfer switch kit: match the whole package to the job

By the Plain Prepper editors. Updated 2026-10-15.

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Quick answer

A useful generator transfer switch kit includes the right transfer equipment, inlet and cord for the installation your electrician has designed. Compare the complete model suffix and bill of materials. Reliance's examples below change circuit count, cord length and inlet material; an outdoor inlet does not make the included indoor transfer panel weatherproof.

Choose a kit from an installation plan

Start with the circuits you want during an outage, the generator you will use and the proposed equipment locations. Give that information to a qualified electrician before choosing a package. A kit can bundle useful parts, but its name does not establish that every part suits your house.

This comparison focuses on what arrives in the box. Reliance's catalog shows similar model numbers with different inlet boxes and cords. That makes the suffix worth checking before comparing offers. Ask the electrician for the complete kit identification and a separate list of anything still needed.

The examples are manual selected-circuit arrangements. The owner still needs the operating instructions for the installed system and generator. If you expect automatic response while nobody is home, raise that requirement before buying one of these manual kits.

Compare the included switch, inlet and cord

Reliance catalog kit	Transfer panel	Separate outdoor inlet	Included outdoor cord
306CRK	306C, six circuits	PB30, metal	PC3010, 10 feet
310CRK	310C, ten circuits	PB30, metal	PC3010, 10 feet
310CDKN	310C, ten circuits	PBN30, nonmetallic	PC3020, 20 feet

Reliance lists these kit connections as 30 A with L14-30 identification. Use the actual generator and installation documentation to establish compatibility. Do not infer approval from a similar connector in a seller photo.

The last package changes inlet material and cord length, rather than adding more circuits to the transfer panel. If the ten-circuit panel already fits the circuit plan, those included accessories may be the meaningful difference between the two larger kits. Confirm the seller supplies the exact catalog package.

Decode the suffix before paying for missing parts

In Reliance's model breakdown, RK adds a metal inlet box and a 10-foot cord. DK adds a metal inlet box and a 20-foot cord. DKN specifies a nonmetallic inlet box with the 20-foot cord. An otherwise similar switch-only listing may omit those accessories.

The catalog also distinguishes the panel configuration from the accessory package. Its C configuration has wattmeters and no power inlet built into the panel. The separate inlet box in the kit is therefore a real part of the arrangement, not an interchangeable detail to ignore in the offer.

Build a shopping checklist with separate lines for the switch, inlet, cord, manuals and installer-specified materials. Ask the seller about an unclear component rather than assuming the package photo proves inclusion. If the kit number and parts list disagree, resolve that before ordering.

Keep substitutions visible to the electrician. A different inlet material may be an intentional choice, while a different cord or panel could change the approved plan. The point of buying a kit is to obtain the specified combination, not simply the greatest number of accessories.

Do not count circuits as independent appliance promises

Reliance's decoder describes the ten-circuit format as ten single-pole circuits or five double-pole circuits. A circuit count therefore needs context. Give the electrician the actual equipment list rather than treating a ten-circuit label as room for ten arbitrary appliances.

Ask which circuits will be transferred, which equipment needs a paired arrangement and which loads must wait while others run. Keep that list with the handover documents. Choosing more transfer positions does not itself increase generator output.

Have the installer confirm the exact circuit protection, generator requirements and neutral arrangement under the applicable manuals. The kit comparison does not establish that every existing circuit is suitable for any of these panels. Get unresolved compatibility questions answered before purchasing the enclosure.

Separate indoor equipment from the outdoor connection

The maker's cabinet decoder identifies the unprefixed transfer cabinet as indoor; the included PB30 and PBN30 inlet boxes are the outdoor components. On the kit illustrations, the NEMA 3R rating sits with the inlet box. Do not assign that inlet rating to the entire package.

Mark both equipment locations on the installation plan. The transfer panel and inlet serve different places in the connection, and the cord reaches from the generator to the inlet. Have the electrician confirm the complete layout and any additional materials for that route.

NFPA requires portable generators outside at least 20 feet from the building, with exhaust directed away from openings. A 10-foot included cord is not evidence of a compliant position. The 20-foot cord adds 10 feet of nominal length, but bends and the actual route still matter. Do not move an engine closer simply to use the bundled cord.

Check the offer and arrange a usable handover

Match the complete model number on Amazon with the maker's parts list and the electrician's quote. Confirm the panel, inlet and cord together. Current stock and the contents of individual seller offers have not been established by the catalog examples here.

NFPA calls for a qualified electrician to install correctly rated transfer equipment for house wiring. Ask for the exact installed manuals, the permitted load list and a demonstration of owner operation. Keep the generator instructions with them so the electrical connection and outdoor engine routine are considered together.

Inspect cords for damage as NFPA advises, maintain household CO alarms and switch the generator off and let it cool before refueling. Never run a portable generator in an attached garage, even with the door open. The inlet box gives the cord a connection point; it does not make an enclosed engine location safe.

What to look for when you buy

Questions people ask

What comes in a generator transfer switch kit?

Check the exact package. Reliance's examples include a manual transfer panel, separate outdoor inlet and generator cord. Similar switch-only or differently suffixed listings can change the contents.

Is an outdoor inlet proof the transfer panel can go outside?

No. The catalog distinguishes the indoor switch cabinet from the separate outdoor inlet. Use the exact enclosure rating and installation manual for each component.

Does the included cord establish safe generator placement?

No. NFPA specifies outdoor placement at least 20 feet from the building, with exhaust away from openings. Check the actual route and approved cord with the installer rather than positioning the generator to fit the bundle.

Can I install a transfer switch kit myself?

Have a qualified electrician install correctly rated transfer equipment for house wiring, as NFPA advises. A prewired kit description does not replace installation design, inspection or the exact equipment manuals.

Sources

• Product catalog, model decoder and transfer-switch kits, pages 7 and 23-25, Reliance Controls
• Generator safety, transfer installation, cords and outdoor placement, NFPA

Sources checked 2026-10-15.