Manual motor protector — 20 A, Trip Class 10, 45 mm
The ABB MS132-20 is a 3-phase manual motor protector (MMP) rated at 20 A, with an adjustable full-load ampere (FLA) range of 16 to 20 A. The 45 mm width is a key panel-fit spec: it occupies a single 45 mm DIN-rail module, matching the footprint of the ABB MS116 series and most IEC motor starter components. If you're swapping an existing MS116-1.0 (10 A max) for a higher-current motor, the MS132-20 drops into the same slot without re-drilling the panel or moving the rail.
Protection logic and what it covers
The MS132-20 integrates short-circuit protection and phase-failure detection into the same 45 mm housing. Phase-failure detection means the protector opens all three poles if one phase drops out — a common cause of single-phasing damage in delta-connected motors. This is a step above basic thermal-magnetic protectors that only respond to overload current. Rated at 600 V, it covers 480 V and 600 V nominal systems common in North American industrial panels, as well as 400 V IEC installations. The 16–20 A FLA range suits motors in the 5–10 HP range at 460 V, or 7.5–15 HP at 230 V — typical for pumps, small conveyors, and fans.