It snaps onto the breaker's side via the DIN rail profile, adding zero extra panel width beyond the 19 mm it already occupies. When voltage dips or fails, the release trips the breaker in 20 ms max — fast enough to prevent single-phasing damage on a motor load.
Rated 690 V insulation voltage with pollution degree 3 — that's the industrial panel environment: conductive dust, occasional condensation, no derating needed for standard motor control center atmospheres. The operating range of -20 to +60 °C covers most non-conditioned enclosures; storage tolerance of -50 to +80 °C means it survives warehouse extremes without damage. Width of 19 mm is the key dimension for panel fill — it's a single-module-wide accessory that stacks directly against the 3RV2 breaker body. No extra side clearance required for the snap-on mount.