Square D GJL36030 Molded Case Circuit Breaker

The GJL36030 has been replaced by the PowerPacT H-frame series. The direct functional equivalent is the HJL36030, which maintains the same 30A rating, 3-pole configuration, and 65kA at 480V interrupting capacity, though physical dimensions differ.

The "J" designates the interrupting rating tier within the Square D PowerPacT G-frame family. For this breaker, it indicates a high interrupting capacity of 100kA at 240V and 65kA at 480V.

In standard Square D nomenclature, the "3" indicates it is a 3-pole breaker, the "6" signifies a 600V maximum voltage class, and the "030" denotes the 30-amp continuous current rating.

No, the 600V rating on this breaker is specified as 600Y/347V. This indicates it is only rated for use on solidly grounded wye systems at 600V, where the voltage to ground does not exceed 347V. It is fully rated for standard 480V and 240V systems.

The GJL36030 is a unit-mount (feed-thru) breaker. It does not plug onto a busbar or use an I-Line connection. Instead, it is bolted directly to a backpan or enclosure and uses wire lugs on both the line and load sides.

Yes, this unit-mount circuit breaker can be installed on a standard 35 mm DIN rail by using the Square D GYR DIN rail adapter accessory.

Yes, the GJL frame supports various field-installable accessories, including shunt trips, undervoltage releases (UVR), auxiliary switches, alarm switches, and padlock attachments (such as the AHP padlock provision).

This breaker features a fixed thermal-magnetic trip unit that provides long-time (thermal) and instantaneous (magnetic) protection. The trip settings are factory-fixed and cannot be adjusted in the field.

Always de-energize the switchboard or control panel before installation. Verify that power is completely disconnected using a properly rated voltage sensing device, and ensure the breaker is in the OFF position before terminating the line and load conductors.