Last updated October 5, 2026. Specs are from manufacturer catalog and install PDFs rechecked 24 September 2026 (same Reliance CDN documents as the 31 August 2026 research). We did not install or lab-test these switches. This is not an install guide and not electrical advice. Interlock vs transfer switch notes below are product-class honesty — not certified DIY instructions.
A portable generator plugged into a dryer outlet or a homemade jumper can backfeed the utility. Neighbors and line workers can get hurt. A manual transfer switch is the named piece of equipment that selects which source feeds selected house circuits — utility or generator — without tying the two together.
This page stays on UL 1008 transfer-switch equipment in the Reliance Controls Pro/Tran 2 class: indoor manual switches and kits for a portable generator and a home panel. It is not a panel interlock plate. It is not an automatic standby ATS. It is not a how-to for opening your panel.
Biggest mistakes with a portable generator and transfer switch
These mistakes show up before anyone opens a catalog PDF. Off Grid will not walk a DIY panel job — hire a licensed electrician when the work touches the panel or inlet.
- Backfeeding. A dryer-outlet jumper or male-to-male “suicide cord” can energize utility lines. Neighbors and line workers can get hurt. That is not a transfer switch.
- Skipping UL 1008 gear. This page stays on transfer-switch equipment listed to UL 1008 (Reliance Pro/Tran 2 class in the shortlist). A sliding panel interlock is a different product class — do not treat marketplace blurbs as the UL source.
- Guessing bonding / skipping the electrician. Floating-neutral vs bonded generator setup, new outdoor inlets, load calc, and local NEC 702 / permit rules are electrician territory. Call one before anything lands on your panel.
Specs below stay with Reliance catalog and install PDFs. We did not install or lab-test these switches.
Interlock kit vs transfer switch — can I connect a power station to my house?
Short answer: a UL 1008 manual transfer switch (this page’s Reliance Pro/Tran 2 class) and a panel interlock kit are different product classes. Both exist so utility and backup are not tied together; neither is permission to DIY open your panel. To feed selected house circuits from a portable generator or power station, the honest path is a listed inlet plus a transfer method your jurisdiction accepts — installed by a licensed electrician. Never use a male-to-male “suicide cord” into a dryer outlet or wall receptacle.
Plain differences (not a code ruling):
- Manual transfer switch (UL 1008 equipment): a separate enclosure that switches named circuits between utility and generator with break-before-make action. This page’s shortlist stays here. Maker language for Pro/Tran 2: manual / Loadside™ transfer switch — not an interlock.
- Panel interlock kit: hardware that mechanically prevents the main breaker and a backfed breaker from being on together. It is widely discussed online; it is not the same as UL 1008 transfer-switch equipment. Marketplace blurbs are not the UL source. Whether an interlock is legal for your panel and AHJ is an electrician / permit question — Off Grid will not certify it.
- Power station vs generator: same backfeed hazard. A power station plugged into house wiring without a proper inlet + accepted transfer/interlock path is still unsafe. Match inlet amperage, cord, and bonding to what the electrician designs — this article will not publish a DIY wiring sequence.
Off Grid’s honesty line: we name UL 1008 and Reliance catalog facts; we will not pretend a blog post makes you a certified electrician.
What a transfer switch is for
Reliance’s Pro/Tran 2 install PDF describes the product as a two-pole transfer switch. It does not switch the neutral. It is intended for a floating-neutral portable generator. The catalog describes double-throw, break-before-make switch action on each Pro/Tran 2 circuit. Maker language: manual / Loadside™ transfer switch — not an interlock.
In plain terms: each selected circuit can take power from the utility path or the generator path, not both at once. That is the safety job of the device class. Whether your generator, grounding, and panel layout match that floating-neutral model is a licensed-electrician question, not something this article can settle from a catalog PDF.
Why UL 1008 matters
UL 1008 is UL’s standard titled Transfer Switch Equipment (Edition 9). UL’s shop scope (1.1) covers transfer switches with a maximum rating of 1000 V in non-hazardous locations, including automatic transfer switches and manual or non-automatic transfer switches, among other equipment types.
UL Solutions lists nonautomatic transfer switches under UL 1008 among the switch-certification areas it evaluates.
Reliance’s Pro/Tran 2 catalog states the series is UL Listed to Standard 1008 and suitable for use in accordance with Article 702 of the National Electrical Code (ANSI/NFPA 70) — optional standby. Retail kits in that catalog are printed cULus1008 Listed.
A listing on the manufacturer’s current catalog is the bar we use here. Seller blurbs on a marketplace are not the UL source. A sliding panelboard interlock plate is a different product class; UL 1008’s published scope is transfer-switch equipment, not an interlock kit marketed as a substitute. Reliance’s own catalog also separates Pro/Tran 2 circuit selector switches from Panel/Link® transfer panels that use interlinked breakers. Those Panel/Link SKUs are not on this shortlist.
When to call an electrician
Call a licensed electrician — and follow local permitting — before anything is connected to your panel or outdoor inlet:
- You do not already have a correctly installed transfer switch or interlock that your jurisdiction accepts.
- You are choosing between a manual transfer switch, a panel interlock, or a standby ATS.
- Your generator bonding / neutral setup is unknown (bonded vs floating).
- The run needs a new outdoor inlet, conduit, or load calculation for the circuits you want on generator.
- An inspector or utility has rules for optional standby (NEC 702 and local amendments).
Do not use a suicide cord, a male-to-male jumper, or a dryer-outlet backfeed. This site will not walk through panel wiring, breaker swaps, or torque specs. The install PDF exists for the electrician who owns the job — not as a weekend DIY checklist.
Current shortlist (Reliance Pro/Tran 2 — maker specs only)
Three current catalog SKUs from Reliance’s Pro/Tran 2 materials fetched 31 August 2026. Voltage on those kit/switch pages is printed 125/250V, not “120/240 V.” Factory 15 A vs 20 A breaker mix is not printed on the kit tables we fetched — marked unknown below. Amazon links appear only where a live amazon.com listing confirmed the current model ASIN.
Reliance Controls Pro/Tran 2 310CRK — 30 A, 10-circuit indoor kit
Official kit name: 310CRK Ten-Circuit Kit. Legacy cross-reference: Pro/Tran 31410CRK → Pro/Tran 2 310CRK. The kit ships the 310C indoor switch.
From the manufacturer catalog and install PDF (family column A310):
- 10-circuit kit (10 single-pole or 5 double-pole)
- 30 amps @ 250 volts (AMP30; suitable for 30 A, 125/250 V input)
- Max combined loads: 60 A @ 125 VAC / 30 A @ 250 VAC; max watts 7500
- Max load/circuit from generator: 2–30 A, 8–20 A
- Indoor surface-mount powder-coated steel switch; kit includes PB30 outdoor inlet (NEMA 3R), PC3010 30 A 10-foot cord with L14-30 molded ends, and wire connectors
- Onboard power inlet on the 310C: N/A (C = watt meters, no inlet)
- Series: UL Listed to Standard 1008; retail kits cULus1008 Listed; NEC Article 702 language on the series intro
Factory 15 A vs 20 A breaker mix: unknown on the catalog kit table fetched for this research.
310CRK on Amazon (ASIN B00VX5LFWS — Model# 310CRK confirmed on a live listing 31 August 2026; listing still HTTP 200 on 24 September 2026 — verify model on the page before buy)
Reliance Controls Pro/Tran 2 510C — 50 A, 10-circuit indoor switch
Official model: 510C Transfer Switch. Configuration C = watt meters, no power inlet. Legacy cross-reference: Pro/Tran 51410C → Pro/Tran 2 510C.
From the manufacturer catalog and install PDF (family column A510):
- 10-circuit (10 single-pole or 5 double-pole)
- 50 amps @ 250 volts (AMP50; suitable for 50 A, 125/250 V input)
- Max combined loads: 100 A @ 125 VAC / 50 A @ 250 VAC; max watts 12500
- Max load/circuit from generator: 2–30 A, 8–20 A
- Indoor surface-mount; dims 11.25 × 11.75 × 4.5 in; ship 18.2 lb
- Inlet on the switch: N/A. Optional remote inlet in the same catalog: PB50 (50 A @ 125/250 V, CS6375, NEMA 3R). Min cord AWG 6. No cord ships with the 510C row
- Same Pro/Tran 2 UL 1008 / NEC 702 series language as above
This is switch only, not a retail cord+inlet kit. Outdoor 50 A counterparts in the same catalog (R510A / R510B) are different SKUs.
510C on Amazon (ASIN B00TSJPQEO — 510C Pro/Tran2 confirmed on a live listing 31 August 2026; listing still HTTP 200 on 24 September 2026 — verify model on the page before buy)
Reliance Controls Pro/Tran 2 306CRK — 30 A, 6-circuit indoor kit (no Amazon link yet)
Official kit name: 306CRK Six-Circuit Kit. Legacy cross-reference: Pro/Tran 31406CRK → Pro/Tran 2 306CRK. Treat 31406CRK as a superseded SKU, not the current pick. The kit ships the 306C indoor switch.
From the manufacturer catalog and install PDF (family column A306):
- 6-circuit kit (6 single-pole or 3 double-pole)
- 30 amps @ 250 volts (AMP30 / L14-30)
- Max combined loads: 60 A @ 125 VAC / 30 A @ 250 VAC; max watts 7500
- Max load/circuit from generator: 2–30 A, 4–20 A
- Kit contents mirror the 30 A retail pattern: 306C with watt meters + PB30 NEMA 3R inlet + PC3010 10-foot 30 A L14-30 cord + wire connectors
- Same cULus1008 Listed / series UL 1008 language as the other Pro/Tran 2 kits
Amazon ASIN for 306CRK: not confirmed. A live listing titled 31406CRK is not this SKU. We are not inventing an ASIN or linking the superseded model as if it were 306CRK. Buy from a seller that prints 306CRK on the carton, or have your electrician order the current catalog kit.
Specs at a glance (manufacturer PDFs only)
| Product | Circuits | Amp class | Max watts (install PDF) | Kit / switch | UL 1008 source | Amazon ASIN |
|---|---|---|---|---|---|---|
| Pro/Tran 2 310CRK | 10 | 30 A @ 250 V | 7500 | Kit: 310C + PB30 + PC3010 | Maker catalog / series | B00VX5LFWS |
| Pro/Tran 2 510C | 10 | 50 A @ 250 V | 12500 | Switch only (optional PB50) | Maker catalog / series | B00TSJPQEO |
| Pro/Tran 2 306CRK | 6 | 30 A @ 250 V | 7500 | Kit: 306C + PB30 + PC3010 | Maker catalog / series | Not confirmed |
Voltage printed on those catalog pages: 125/250V. Factory breaker mix (15 A vs 20 A): unknown on the kit tables fetched for this research.
What we are not claiming
- We did not install, meter, or “test” these switches.
- We are not saying a transfer switch makes every generator setup code-legal in every town.
- We are not publishing watt-hours, runtimes, or medical claims. Transfer-switch pages do not work that way.
- We are not treating a panel interlock as a UL 1008 transfer switch.
- We are not recommending superseded SKUs (31406CRK / 31410CRK) as current Pro/Tran 2 picks.
If you need overnight medical backup or fridge runtime math instead, use the job pages that size from published watt-hours — this page is the safety / equipment-class lane.
Related how-to on this site
- How to size a CPAP backup battery (Wh÷W)
- How to size a battery for a 12V fridge
- Nebulizer compressor backup sizing
- Mobility scooter / power chair charger from a power station
- Solar DC well pump: suitcase Voc and 12–30 V path
- Home battery / backup systems guide
- Guides hub
Sources
Numbers above match the 31 August 2026 research file; catalog + install PDFs re-fetched 24 September 2026 with the same amp/circuit/UL language. No substitutions.
- https://api.reliancecontrols.com/media/DAFD6437178010536126/DAFL6902119740201409.pdf — Pro/Tran 2 catalog (CATPT2PL); 306CRK, 310CRK, 510C; series UL 1008; kit cULus1008
- https://api.reliancecontrols.com/media/DAFD6560942639833572/DAFL6775321853807447.pdf — Pro/Tran 2 install PDF (two-pole / floating-neutral; A306 / A310 / A510)
- https://www.shopulstandards.com/ProductDetail.aspx?productId=UL1008 — UL 1008 Transfer Switch Equipment, scope 1.1
- https://www.ul.com/services/switch-certification-and-evaluation-services — UL Solutions: nonautomatic transfer switches (UL 1008)
- https://www.amazon.com/Reliance-Controls-310CRK-Circuit-Transfer/dp/B00VX5LFWS — ASIN confirm only (310CRK)
- https://www.amazon.com/510C-50-Amp-10-Circuit-Manual-Transfer/dp/B00TSJPQEO — ASIN confirm only (510C)
It is transfer-switch equipment listed to UL’s Transfer Switch Equipment standard. A manual Pro/Tran 2 unit selects circuits between utility and generator with break-before-make action so the two sources are not tied together. Hire a licensed electrician for install and local code.
They are different product classes. A UL 1008 manual transfer switch (this page) is dedicated transfer-switch equipment for selected circuits. A panel interlock kit mechanically interlocks breakers in the panel. Neither replaces a licensed electrician, and Boom does not treat an interlock as a UL 1008 transfer switch.
Only through a path your electrician and AHJ accept — typically a listed inlet plus a transfer switch or other accepted isolation method. Never a male-to-male cord into a dryer outlet or wall receptacle. A power station has the same backfeed risk as a generator.
No. It can energize utility lines and endanger line workers and neighbors. That is not a transfer switch.
Robert DeWitt writes about off-grid power gear for Off Grid Power Boom. Based in Arizona, he uses portable power stations, solar panels, and battery systems regularly in extreme heat—focusing on practical runtime, charging speed, reliability, and real-world usability for camping, RV trips, and home backup.
Editorial focus: portable power stations & solar generators, solar panel setups, batteries/inverters, and off-grid preparedness.