Square D “M” Frame Breakers

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Square D has a large variety of circuit breaker frames. Each frame has unique specifications and ratings tailored to meet many different needs. Whether your application demands a large “M” frame for 300-1000 amps or a small “F” frame of 15-100 amps, it is vital to make sure you select the right frame for the correct application. At Electrical Power and Control, we make it our mission to “EmPower Your Business,” which means providing you with the information needed to make a confident and knowledgeable decision when selecting a circuit breaker.

Depending on your application, Square D’s “M” frame might be the right frame for you. It has an amperage rating of 300-1000 amps, which makes it the ideal choice for larger industrial loads. Depending on your needs, the “M” frame has different voltage options that range from 240 vac up to 600 vac. It also has either a 2 or 3 pole configuration. The “M” frame comes in two different designs: lug-to-lug and I-line. A traditional lug-to-lug frame has lugs on both ends while the conventional, I-line, bus-mounted frame has lugs on one end and a crown on the other, which makes installation a breeze.

Knowing your electrical needs is essential when selecting the right breaker. We took the time to create a chart below that will give you a better understanding of the “M” frame and its catalog number so that you can choose the right circuit breaker confidently. If you are confused or have any questions, please contact us or leave a comment below.

M-Frame Chart/Diagram
M-Frame Chart/Diagram