The Square D HDA36150U31X is a 3 Pole solid state molded case circuit breaker with a current rating of 150 Amps and a voltage rating of 600VAC. It has an interrupting rating of 18kAIC at 480VAC. The HDA36150U31X has an I-Line style plug-in connection type and includes long time and instantaneous trip functions.
What type of panels accept the HDA36150U31X circuit breaker?
This breaker is specifically designed for Square D I-Line panelboards and switchboards. It utilizes a plug-on line connection that mounts directly to the interior bus system, eliminating the need for separate line-side wiring.
What does the U31X suffix mean on the HDA36150U31X?
The U31X designates that the breaker is equipped with a Micrologic 3.2 electronic trip unit. This solid-state unit provides adjustable Long-Time and Instantaneous (LI) trip functions for precise circuit protection.
What wire sizes are supported by the load lugs on this 150A breaker?
The factory-installed load lugs accept either aluminum or copper conductors ranging from 14 AWG to 3/0 AWG. Ensure proper torque specifications are followed during installation.
How do the I-Line connectors on the HDA36150U31X react during a fault?
Square D I-Line breakers feature unique blow-on type line-side connectors. In the event of a short circuit, the increased magnetic flux forces the plug-on connectors to grip the panelboard busbars tighter, maintaining a secure connection when it matters most.
Can the I-Line mounting bracket be removed to use this breaker as a unit-mount?
No. The I-Line connectors and mounting bracket are integral, factory-assembled parts of the HDA36150U31X and cannot be removed or converted for unit-mount applications.
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