Frame Rating vs Continuous Current — Selectivity Headroom
The 1SDA068150R1: The XT4N 160 frame (Iu=160 A) carries a fitted Ekip I electronic trip unit set to In=100 A. This 60 A gap between the frame rating and the trip setting gives the coordination engineer headroom for selective coordination downstream — the breaker can pass a short-time withstand current up to the frame limit without tripping, letting a downstream device clear the fault first. Rated voltage is 690 V AC at 50/60 Hz, covering standard industrial distribution voltages from 400 V to 690 V line-to-line without derating the frame.
4-Pole Configuration for Neutral Protection
Four poles mean the neutral pole is switched and protected — required in TN-S or TN-C-S systems where the neutral is distributed through the breaker and must be isolated during maintenance. The XT4N footprint (8.25 cm x 14 cm x 16 cm) fits standard ABB switchboard mounting plates without adaptor brackets.
Lifecycle and Sourcing — Active Production
No official successor or cross-reference exists because the part is the current offering. If the BOM calls for a different trip rating, the XT4N family supports interchangeable Ekip trip units without changing the breaker frame.