Manual transfer switch kit
Reliance Controls 10-Circuit Generator Transfer Switch Kit
A 30 A, 10-circuit manual transfer switch that mounts beside the panel, with the outdoor inlet box and generator cord in the box — the legal, no-backfeed way to run chosen circuits from a portable generator.
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Best for
Portable generators up to 7,500 running watts with an L14-30 outlet
Specifications
| Rating | 30 A, 125/250 V; generators up to 7,500 running watts |
|---|---|
| Circuits | 10 — up to 10 single-pole or 5 double-pole |
| Factory breakers | (1) 2-pole 20 A, (2) 1-pole 20 A, (6) 1-pole 15 A |
| In the kit | Switch with 18 in pre-wired conduit, outdoor inlet box (PB30), 10 ft 30 A generator cord |
| Generator outlet | NEMA L14-30 (4-prong 120/240 V twist-lock) |
| Metering | Two wattmeters for balancing the load |
| Listing | cULus listed to UL 1008 |
| Warranty | 5 years |
Specifications as published by Reliance Controls. Confirm against the current spec sheet before buying — manufacturers revise models without renaming them.
What's good
- Double-throw switches can't connect the generator and the utility at the same time — backfeeding is impossible in any position
- Mounts beside the existing panel of any common brand; no panel replacement
- Inlet box and cord included, so the generator stays outside at a distance
What's not
- Electrician install, and usually a permit — check with your local inspector
- Circuits lose AFCI/GFCI protection on generator power unless matching breakers are fitted in the switch
- Not for electric water heaters, dryers, ranges or central A/C
- Reliance renumbered the kit 310CRK; Amazon lists the older 31410CRK part number with the same core contents and ratings
Our verdict
If a portable generator is going to power anything hardwired — a furnace blower, a well pump, lighting circuits — this is the kind of hardware that makes it legal: the switch physically can't tie the generator to the utility. CPSC's standing warning against plugging a generator into a wall outlet, and against male-to-male cords, is the reason it exists. Size the generator first; the kit handles up to 7,500 running watts.
Compare with the alternatives
- Kidde COBD10 Carbon Monoxide Alarm — every level of the home and outside sleeping areas, before generator season
- Kidde 30CUD10-V Smoke + CO Alarm — hallways outside bedrooms, where a smoke alarm and a co alarm are both needed
- Southwire 12/3 SJTW 50 ft Outdoor Extension Cord (2588SW0002) — running a fridge, freezer or space heater from a portable generator at a safe distance