Square D HJA36020 Molded Case Circuit Breaker

The HJA36020 features an I-Line style plug-in connection, making it compatible with Square D I-Line panelboards and switchboards. It utilizes an ABC phase connection and cannot be used in standard NQ or NF series panelboards.

For the standard load-side mechanical lugs, the manufacturer tightening torque is 44.3 lbf.in (5 N.m) when using 14 to 10 AWG wire, and 123.9 lbf.in (14 N.m) when using 8 to 3/0 AWG aluminum or copper wire.

Yes. Standard PowerPacT H-frame thermal magnetic circuit breakers equipped with fixed trip units are suitable for reverse connection.

Yes. The PowerPacT H-frame design supports field-installable internal accessories. Under the front cover, there are dedicated slots for an auxiliary switch (OF), alarm switch (SD), overcurrent trip switch (SDE), and a voltage release such as a shunt trip (MX) or undervoltage release (MN).

Yes. The PowerPacT H-frame I-Line series offers an upgrade path for legacy Square D F-frame breakers. The HJA36020 can directly replace older 20A, 3-pole I-Line models such as the FA36020, FH36020, and FC36020.

As an I-Line circuit breaker, it utilizes a plug-in connection on the line side to attach directly to the panelboard bus. The load side comes equipped with factory-installed mechanical lugs for standard wire termination.

The LI designation indicates that the thermal magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The long-time function provides fixed thermal protection against sustained overloads, while the instantaneous function delivers fixed magnetic protection to clear short circuits rapidly.