JJA36175 SQUARE D 3P 175A 600V 25KA I LINE

"I-Line" refers to Square D's proprietary plug-in bus system used in their commercial and industrial panelboards and switchboards. The JJA36175 features an I-Line plug-in jaw that clips directly onto the I-Line bus — no separate bolt connections required. It will only fit enclosures specifically designed for Square D I-Line breakers. It is not compatible with QO, Homeline, or other plug-on residential systems. Share your panelboard model number with us and we'll confirm compatibility.

Yes — the JJA36175 is a current Square D J-Frame offering and is commonly used as a direct replacement for earlier J-Frame I-Line units of the same rating (3P, 175 A, 600 V). If you're replacing a breaker with a different suffix or trip unit style, specs should be cross-checked carefully. Northern Breaker Group specialises in obsolete and hard-to-find breakers, so contact us with your existing breaker's full part number and we'll help identify the correct replacement.

The JJA36175's 25 kA interrupting capacity at 600 V meets the requirements for many commercial and light industrial distribution points, but available fault current at the installation point must be calculated to ensure the breaker's rating is not exceeded. Canadian Electrical Code (CEC) Section 14 requires that the interrupting rating of a protective device be equal to or greater than the maximum available short-circuit current at its location. If your system's available fault current exceeds 25 kA, a higher-rated J-Frame variant may be required. Consult a licensed electrician or engineer to verify.