Question about ABB S272-k16 2-pole Miniature Circuit Breaker

1 Answer

Backfeed Miniature Breakers with Solar?

I am installing photovoltaic systems. However, there are some households with cramped panelboards. I need to know if it is possible to backfeed power with miniature circuit breakers.

If so, which breakers can I use? Any double pole that doesn't specify line or load?

Some help would be great.

Thank you,


Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Contributor
  • 20 Answers

I'm not up to date on PV systems so i will answer what i can about your question. The NEC applies to these installations so i hope you are familiar.

If the dc-ac inverter puts out 2 phase power then yes any two pole breaker rated for the amperage you are putting out would be fine. If the inverter puts out 120 then any single pole breaker will work.

That i know of, there are no 2 pole miniature or two handle breakers. There are breakers with two handles on them but they are tied to the same phase. the only thing i can think you may do would be to put a two handle single pole breaker in place of a regular breaker and then the one below it also. Then hook one leg off your inverter to one of the handles on the top breaker and the other leg to the bottom breaker.

Breakers do not have a line and load per say. The screw where wires are hoooked to is the load side of the automatic trip in the breaker however. The line would be where the breaker hooks to the bus bar but you can't really hook to that anyhow.

I would ensure what you do is up to code. There are safety issues involved. i assume you know your job though so i will leave it at that :) Hope this helped, write back if you feel i misunderstood.

Posted on Apr 05, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Ways to generate electricity

Fossil fuel (coal, gas, etc)

Electricity generation Wikipedia

Sep 12, 2017 | Electrical Supplies

1 Answer

What is the difference between and what is photovoltiac versus solar energy

Solar energy is the output from our sun though not strictly correct it is sufficient for most purposes to say it is the sun's energy that reaches Earth. It includes a wide spectrum of different frequencies/temperatures of light and energy and various types of particle and electromagnetic radiation, a significant proportion of much of the content is deflected by the Earth's magnetic field and various layers of the atmosphere.

The solar energy reaching the Earth's surface is reckoned to average the warming equivalent of 3kW/hr per square metre.

Photovoltaic (PV) is a process that converts the Sun's heat/light into electricity and should not be confused with the Solar/thermal systems designed to use the sun's heat/light radiation to heat water. Mostly this is used for domestic purposes but some large installations exist where large mirrors concentrate light onto a solar panel with enough heat to produce sufficient steam to drive a turbine/generator to produce electricity.

Photosynthesis, incidentally, is the method plants use to convert atmospheric CO2 into growth using energy from the sun.

Jul 19, 2017 | Renewable Energy

1 Answer

How do non conventional energy better than fossil fuels?

Mankind has developed a way to utilize the sun's vast energy by converting its sunlight into electricity via photovoltaics and other solar power methods. The fossil fuels in the form of plants underneath the earth which transform into oil over time are drilled using polluting machinery.

Jan 04, 2017 | Green Living

1 Answer

Solar hot water not hot

Solar hot water giving you cold showers? Eight tips to warm you up.
Eight tips to get the most from solar hot water
We argue that policy needs to look beyond installation and that installation practices need improving, but what can you do to get an effective installation?
First, seek out independent advice from sources such as local sustainability events and organisations. They can help you understand what suits your circumstances and what characterises an effective installation.
A good organisation is theAlternative Technology Association. They provide free advice to members, sell a solar hot water guide, and organise open house events where you can see and discuss domestic sustainability technologies.
Second, consider whether solar hot water is the best option. It may be that a hot water heat pump or an instant gas system is a suitable choice, depending on where you live, how much cloud cover you have, or what sort of building you are in.
Third, make sure all your hot water pipes are insulated, especially the pipes that go to and from the tank and solar panels. You typically need insulation to be 15 mm thick. Without proper insulation you could lose half the energy you are trying to collect.
Fourth, get a booster switch installed in a convenient place inside, so you can easily turn the booster off if there is plenty of sun, or on if it's cloudy or you need more hot water.
Fifth, if you go solar, install a system that has a sufficiently large tank matched with a sufficiently large solar array for your needs. Water is very good at storing heat. A large tank could help you store solar energy for those rainy days.
Sixth, you may need to change electricity tariffs if your booster is electric, to ensure the sun gets a chance to heat the water before the electricity does.
Seventh, you may need to change your peak hot water use habits so that the tank water is at its coldest after morning use, after which the sun can then heat it during the day. The booster can "top up" overnight, ready for morning showers.
Eighth, before you install solar hot water, examine and discuss household expectations around hot water use. Will they need to change? Are members of your household prepared to make that change?
This may be the most profound change you can make, but also perhaps the most challenging.

Oct 30, 2016 | Water Water Heaters

3 Answers

Is this true or scam Government pays you to go solar.

The US government WILL NOT PAY you to go solar. There have been incentives on the state level to get people to install solar panels. Most of these have dried up but it is possible to find programs that will reimburse you a portion of the total cost but don't expect much. We live in Florida and in 2009 we were promised nearly 1/2 back if we installed. We got less than 10% when all was said and done and it took 2 years to get that.

Aug 18, 2015 | Miscellaneous

1 Answer

Can circuit breakers from different manufactures be installed in a panel

I wouldn't do that. Generally breakers are specific to the brand of panelboard you have. It can be as simple as being the difference between a plug-in breaker and a bolt-on breaker but it can be as complicated as putting in a different kind making it no longer UL certified. The UL certification applies to the specific brand of panel board with the specific cover that comes with it and the guaruntee of only same brand circuit breakers in it. Are you having a hard time finding the same brand of breakers or were you considering it because of cost?

Mar 18, 2013 | Square D Electrical Supplies

3 Answers

How many major companies have solar panels?

click in this link

scroll down on page to see manufacturers.
Hope this helps.

Dec 03, 2012 | Computers & Internet

1 Answer

Invertor connections to protect from utilty power backfeed

Inverters normaly have inbuilt protection built into them check for reset button/switch.

Jun 19, 2009 | ABB S272-k16 2-pole Miniature Circuit...

Not finding what you are looking for?
ABB S272-k16 2-pole Miniature Circuit Breaker Logo

432 people viewed this question

Ask a Question

Usually answered in minutes!

Top ABB Electrical Supplies Experts

Craig Butler
Craig Butler

Level 3 Expert

1723 Answers


Level 3 Expert

3289 Answers

Gene Haynes

Level 3 Expert

5245 Answers

Are you an ABB Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides