Mr Cool DIY 9k, 12k, 18k, 24k, 36k Breaker Sizes

What breaker size do you need for a MrCool mini split?

That’s quite easily answered. If you are wondering what fuse size (in amps) you need for your MrCool unit, just check the specification sheet. You will find all Mr Cool mini split electrical requirements.

Every MrCool specification sheet has a line with “Maximum Fuse (Breaker)” specs under the “Electrical Parts” section.

Here’s the problem:

These spec sheets for MrCool units are notoriously difficult to find. Yes, if you know where the specs sheet that came with the unit is, you just check that one. These spec sheets, however, get lost quite often. Googling for the MrCools specs and breaker sizes doesn’t always give you the answers you were looking for.

That’s why we have transcribed the breaker sizes for all MrCool units (including DIY units) from the specs sheets we haven’t yet lost. 🙂 This will help you get your hands on all the Mr Cool power requirements.

You will find these maximum fuse sizes for all different MrCool series and units below. Let’s start with the best-selling DIY units:

Mr Cool DIY Single-Zone Breaker Sizes (20A, 25A, 30A)

The Mr Cool DIY Single Zone series is comprised of 4 different units; namely 12k, 18k, 24k, and 36k units.

Here are the breaker sizes as per the specs sheets:

As you can see, the DIY series uses 20A, 25A, and 30A. Example: Mr Cool DIY 24k breaker size is 25 amps. This is the maximum size.

Mr Cool DIY Multi-Zone Breaker Sizes (20A, 25A, 30A)

With multi-zone mini splits, you have two breaker sizes you need to check:

• Outdoor unit – Heat pump condenser.
• Indoor unit – Wall-mounted air handler.

For the smaller 3-zone outdoor MrCool DIY unit (DIY-MULTI3-18HP230), you will need a 35A maximum breaker. For the bigger 4-zone outdoor unit (DIY-MULTI4-27HP230), you will need a 45A maximum breaker.

Here is a chart of MrCool DIY multi-zone indoor unit breaker sizes:

In short, all Mr Cool DIY Multi-Zone indoor units require a 15A breaker.

Mr Cool Advantage Series (20A, 25A, 30A)

Advantage Series MrCool units have to be installed by a professional. They are not DIY units.

Here are the breaker sizes for indoor and outdoor units:

At higher voltage (230V) you need less amps to generate the same amount of power (wattage). That’s why you need bigger breakers with 115V MrCool Advantage units.

MrCool Olympus E Star Series Breaker Sizes

These are older MrCool models. Here are the breaker sizes:

MrCool Olympus Hyper Heat Series Breaker Sizes

This is about it. If you would need a to know a breaker size for a specific MrCool model, just use the comments below and we’ll find the breaker size for you.