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We carry a wide variety of brands, including:
Allen Bradley
General Electric
Siemens
Square D
Cutler Hammer / Westinghouse

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Used and New Square D MJA Frame I-Line Circuit Breaker

We stock used and new surplus Square D MJA frame I-Line circuit breakers in our Minneapolis warehouse. MJA breakers are extra high interrupting breakers.

300 Amps to 800 Amps
2 and 3 pole
600 Volts and less
Powerpact Breaker
MA, MH, MH, MGA, MAL, MHL and more also available

We have been selling I-Line circuit breakers for over 30 years. Contact us or call us today at 1-888-588-6560, and we’ll help you find exactly what you’re looking for.

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Will this I-Line breaker fit in your panelboard?

More Square D Breakers

Click on the catalog numbers for more specific info

Catalog #	Amps	Volts
MJA36300	300	480/600
MJA36350	350	480/600
MJA36400	400	480/600
MJA36450	450	480/600
MJA36500	500	480/600
MJA36600	600	480/600
MJA36700	700	480/600
MJA36800	800	480/600

Quick Specs:
Manufacturer	Square D
Frame	MJA
Type	I-Line
Mounting Space	8.3"
Dimensions	8.3" W X 8.1" D X 12.8" H
Trip Unit	Electronic - Non Interchangeable

Interrupting Ratings:
240 Volts	100 kA
480 Volts	65 kA
600 Volts	25 kA