The GV3PC02 is a TeSys Deca frame 3 surface-mount enclosure designed specifically to house the GV3P or GV3L manual motor starter. It's the metal box with the red rotary handle that gives you IP65-rated protection — meaning the enclosure and the handle seal keep washdown spray out, so this is the right choice for a panel that lives on the plant floor near washdown zones or in a semi-outdoor environment.
The 312 mm height and 181 mm width define the panel cutout and clearance envelope — this is a Deca frame 3 footprint, not the smaller Deca frame 2. The 203.5 mm depth includes the handle projection; plan for that when you're laying out the enclosure door or cover clearance. The metal construction and IP65 seal mean it's not a DIN-rail clip-on; it's a surface-mount box that bolts to a backplate or wall. The red rotary handle is padlockable in the OFF position, which satisfies lockout/tagout requirements at the motor starter itself rather than upstream at the disconnect. That's a time-saver for a maintenance tech isolating a specific motor on a multi-drop line.