What a interlock does
A generator interlock kit is a mechanical slide that lets the main breaker and a dedicated generator breaker work only one at a time. It is specific to your breaker panel's brand and model and must be installed by a licensed electrician where local code allows it.
| Voltage | Maximum watts (amps × volts) | Plan for about 80% continuous |
|---|---|---|
| 120 V | 12,000 W | 9,600 W |
| 240 V | 24,000 W | 19,200 W |
Generators in our catalog with a matching listed outlet
- A-iPower 10700W Electric Start Portable Generator Gas Propane (AP10700ED) — 8,500 W running
- Westinghouse Outdoor Power WGen10500DFc - Dual Fuel — 12,500 W running
- Westinghouse Outdoor Power WGen9500TFc - Tri-Fuel — 11,200 W running
- Westinghouse Outdoor Power ecoGen10000 Inverter Generator — 7,600 W running
- Westinghouse Outdoor Power WGen10500TFc - Tri-Fuel — 12,500 W running
- Westinghouse Outdoor Power WGen11500DFc - Dual Fuel — 13,500 W running
- Westinghouse Outdoor Power iGen8200TFc Inverter Generator - Tri-Fuel — 7,380 W running
- Westinghouse Outdoor Power WGen11500TFc - Tri-Fuel — 13,500 W running
- Westinghouse Outdoor Power iGen12000DFc Inverter Generator - Dual Fuel — 11,000 W running
- Westinghouse Outdoor Power iGen12000TFc Inverter Generator - Tri-Fuel — 11,000 W running
A matching outlet is necessary but not sufficient: the generator's watts, the inlet, the cord and the panel all have to be correct. An electrician confirms the whole chain.
Safety and installation
Compare this with other equipment in the transfer switch library or use the compatibility matrix.
Fit check before you buy
This equipment connects to a home's wiring, so every check below belongs to a qualified person.
- ✓Licensed electricianInstallation, permit and inspection are the electrician's and your local authority's job.
- ?Matching amperageThis item is rated 100 A; the generator outlet, cord and inlet need to match.
- ?Panel fitConfirm it works with your panel brand and model.
- iUtility rulesSome utilities and areas have their own rules for generator connections.
Specifications
Each figure is labelled with where it comes from. Numbered references link to the source list below.
Published specifications
Wattstanding calculations
| Maximum watts at 240 V | 24,000 W | Wattstanding calculation |
|---|---|---|
| Maximum watts at 120 V | 12,000 W | Wattstanding calculation |
Limitations to weigh
- Specifications are the maker's or seller's; Wattstanding has not tested this product and gives no installation instructions.
- Whether it is allowed or suitable for your home is for a licensed electrician and your local authority.
- Prices change; confirm the price, stock and what is included before ordering.
Alternatives worth comparing
Where to buy
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Questions buyers ask
Do I need an electrician to install the DuroMax GenInterlock SD-200SA Generator Interlock Kit Breaker Panel 150/200 Amp Panels Square D Meter Main Homeline?
Where can I buy the DuroMax GenInterlock SD-200SA Generator Interlock Kit Breaker Panel 150/200 Amp Panels Square D Meter Main Homeline?
Sources and verification
- DuroMax — GenInterlock SD-200SA Generator Interlock Kit Breaker Panel 150/200 Amp Panels Square D Meter Main Homeline — product page and specifications Retrieved 30 Sep 2026
Wattstanding has not tested this product hands-on. This reference is compiled from the sources above; our calculations are labelled and show their working. Electrical work belongs to a licensed electrician. Last verified 30 Sep 2026. How we work