Designed for heavy-duty power distribution, the Square D JGA36175 is a 175A, 3-pole molded case circuit breaker from the PowerPacT J-Frame series. It delivers robust thermal-magnetic protection for commercial and industrial facilities. This component mounts into Square D I-Line panelboards and switchboards. It is an exact substitute for the discontinued KA36175, ensuring a seamless upgrade path. Rated 35kAIC at 480VAC, it features a Visi-Trip indicator and current-limiting capabilities.
Can I use the JGA36175 to replace a legacy KA36175 circuit breaker?
Yes. The PowerPact J-Frame JGA36175 is the direct, modernized replacement for the obsolete KA-Frame KA36175 breaker. It mounts into the exact same I-Line panelboards and offers equivalent or superior interrupting capabilities.
How do I decipher the JGA36175 catalog number?
The "J" designates the PowerPact J-Frame. "G" represents the interrupting rating tier. "A" indicates an I-Line style plug-in connection. The "3" means three-pole, the "6" indicates a 600V maximum voltage rating, and "175" specifies the 175-amp trip rating.
Is the JGA36175 trip unit field-interchangeable?
No. This specific breaker features a factory-sealed thermal-magnetic trip unit. If you require a different amperage or trip characteristic, the entire breaker must be replaced, or you must select a unit-mount frame specifically configured for field-interchangeable units.
Do I need a mounting adapter to install this breaker in an older I-Line panel?
No. The JGA36175 is a standard I-Line plug-in breaker. Its integral mounting bracket and plug-on jaws are designed to snap directly onto the bus of both legacy and modern Square D I-Line panelboards and switchboards without adapters.
Does the JGA36175 require an external load lug kit?
No. The breaker comes factory-equipped with line-side plug-on jaws for the I-Line bus and standard mechanical load lugs (part number AL175JD) built-in. These standard lugs accept both aluminum and copper wire within the specified gauge range.
Is the JGA36175 rated for 100 percent continuous loads?
No. Like all standard PowerPact J-Frame I-Line breakers, the JGA36175 is rated for 80 percent continuous loads. Square D does not offer 100 percent rated options in the I-Line plug-in configuration.
What is the purpose of the push-to-trip button on the breaker face?
The push-to-trip button allows you to manually exercise the breaker's mechanical tripping system. Regularly testing this function ensures the internal mechanism operates freely, which is a recommended maintenance practice for electrical safety.
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