What the 3P Rating Means for Fit
The 1SD A053704 R1: The 3P pole rating tells you this accessory mounts to a three-pole breaker — it's not a universal fit for single- or four-pole frames. In a panel, that means the accessory's mechanical interlock and electrical terminals align with the three-phase bus bars. If your BOM calls for a 4-pole breaker (e.g., for a neutral conductor), this accessory won't physically mate. The pole count is the first fit gate; frame series is the second.
