B-Line Eaton series electrical accessories, Used to add a receptacle/outlet inside enclosures, Clip for 35 mm DIN rail, Electrical accessories, Switze

The ER4 clips onto 35 mm DIN rail, so it drops into any enclosure that already has a standard 35 mm rail run inside it. No drilling or panel cutout is needed, and no separate mounting bracket. If your enclosure has no DIN rail, you will need to add a length of 35 mm rail before the receptacle has anything to attach to.

Check your interior depth against 1.9 inches. The ER4 measures 3.6 x 2.4 x 1.9 inches, with the 1.9 inch figure given as the length/depth, so it needs that much clearance off the rail plus room for the cord or plug in front of it. In a shallow wall-mount box with the door gasket close to the backplate, that plug projection is usually what runs out of space first, not the body of the unit.

No. The ER4 is the Switzerland type, meaning it takes Swiss-pattern plugs, not NEMA 5-15. If you are wiring a North American panel and need to plug in a laptop, a light, or a service tool with a US cord, this is the wrong version - order the North American receptacle variant of the B-Line ER series instead.

It gives a technician a power point at the panel without running an extension cord through the door. The ER4 exists specifically to add a receptacle/outlet inside enclosures, so laptops, service lights, and diagnostic tools can be powered at the cabinet. It rides the same 35 mm DIN rail as the terminal blocks and breakers already in there, so it takes up rail space rather than panel real estate.

ER4 is the manufacturer part number, from the Eaton B-Line series of electrical accessories. Order it by ER4 and you get the Switzerland-pattern DIN rail receptacle.