Okay, let's analyze the ABB/GE DET008_REV_AB document (assuming the attached picture is a snippet from it) to determine the Short Circuit Current Rating (SCCR) of a 3-pole THQL breaker when paired with an A2N 3-pole device. Specifically, let's address your concern about the "120/240 1Ph" rating.

Understanding the Document Snippet

The snippet you likely sent shows a series rating table. Here's how to interpret it: Upstream Device

The left-most column lists the upstream (main or feeder) circuit breakers. In this case, we're looking at "A2N 3P."

Downstream Device

The columns to the right list downstream (branch circuit) breakers. We are interested in "THQL 3P".

Series SCCR

The intersecting cells show the available SCCR (in kA) for the combination. The voltage is critical.

Interpreting the 120/240V Single-Phase Rating

You're right to focus on the voltage ratings. The "120/240V 1Ph" rating does affect the applicable SCCR for your 3-pole THQL breaker. Here's why: Series Ratings are Voltage-Specific

Series ratings are determined through testing at specific voltages. A series rating established for 120/240V single-phase is not necessarily valid for a 480V three-phase system, or for any other voltage.

Purpose of 120/240V Rating

If the document states 120/240V, it means those series ratings apply to systems using that voltage.

Three-Phase vs. Single-Phase

Three-phase systems use different voltage levels and circuit configurations than single-phase systems.

Answer to Your Question: "Does 3P THQL breaker series with A2N 3P up to 22kA?" It depends on the voltage of your electrical system. If your system is a 120/240V single-phase system

Then, yes, IF the chart shows a 22kA (or higher) rating at the intersection of the A2N 3P and the THQL 3P. You would need to verify this on the chart.

If your system is NOT a 120/240V single-phase system (e.g., 480V three-phase)

Then, no, you cannot directly apply the 120/240V rating to your three-phase system.

You would need to consult the document for series ratings applicable to your system's voltage. Often, there will be a separate section or chart for 480V or other three-phase voltages. If the documentation does not list the series ratings for your system's voltage, you cannot apply it.

To get a definitive answer, you MUST


Provide the Voltage of Your Electrical System

Is it 120/240V single-phase, 480V three-phase, or something else?2.

Provide the full table

This would allow to see the complete ratings and any voltage limitations.

Important Considerations



SCCR Coordination

Selecting breakers based on series ratings is a common practice to reduce costs while ensuring adequate protection. However, it's crucial that the installation strictly adheres to the tested series combination. You cannot mix and match components or exceed the specified SCCR.

Consult a Qualified Electrician/Engineer

Determining SCCR and selecting appropriate protective devices is a critical task for electrical safety. Always consult a qualified professional for these calculations and selections.

NEC Requirements: The National Electrical Code (NEC) has specific requirements regarding SCCR calculations and the selection of appropriately rated equipment. You must comply with these requirements.In summary, the "120/240V 1Ph" rating is a significant factor, and you can only use the series rating of 22kA if your system is a 120/240V single-phase system and if this series rating exists on the chart. For any other voltage, you need the relevant series rating chart for that voltage. Flag for review