Rated current and motor protection range
The MS325-20 is a 3-pole manual motor protector rated for a 16–20 A adjustable current range, covering motor full-load currents in that band. The 20 A maximum sets the thermal-magnetic trip threshold for overload and short-circuit protection on a 3-phase motor branch.
Mounting and panel integration
Surface-mount form factor — the protector mounts directly to a panel backplate or enclosure wall, not on a DIN rail. This suits retrofit or legacy panel layouts where the existing cutout or mounting pattern expects a surface-mount device.