Camden CM-400 Series Single Gang 1-5/8" Mushroom Pushbutton with 'PUSH TO Exit ', White Text

Two directions to go. For a larger head, the SDC 440 Series emergency exit switch uses a 2-5/8 inch mushroom button, and the SDC 430 Series industrial switch uses a 1-1/2 inch round button. If you want the button lit, the CM-400 is not illuminated, so look at the SDC 410 Series illuminated pushbutton (narrow frame mount) or the SDC 420 Series with 2 inch buttons. The closest straight equivalent to the Camden is the Dortronics 5210 Series, a 1-9/16 inch red mushroom button on a single gang plate marked "Push to Exit" / "Emergency Release".

The nearest match is the Dortronics 5210 Series exit release, which puts a 1-9/16 inch diameter red mushroom button marked "Push to Exit"/"Emergency Release" on a single gang plate. The Camden CM-400 uses a 1-5/8 inch (40mm) free-spinning mushroom button on a single gang 18 gauge stainless steel faceplate with a 4-1/2"H x 2-3/4"W x 1-3/4"D footprint, so the two occupy the same single gang opening with button diameters within a sixteenth of an inch of each other.

Yes. The Camden CM-400 button is 1-5/8 inch (40mm) in diameter. For a bigger target, the SDC 440 Series is a large mushroom button emergency exit switch with a 2-5/8 inch diameter heavy duty design. The SDC 430 Series goes the other direction with a 1-1/2 inch round button in a heavy duty industrial mushroom switch.

A mushroom head is the choice where the button gets hit hard and often, or hit by an elbow or a gloved hand. The CM-400 head is 1-5/8 inches (40mm) across and free spinning, so someone trying to twist or pry it off cannot get purchase on it. The plate behind it is 18 gauge stainless steel. A flat momentary pushbutton is lower profile and less prone to accidental actuation, which matters more in a corridor where people brush the wall.

Camden builds the CM-400 mushroom head in red, blue or green, with other colors made to order. The unit marked "PUSH TO EXIT" in white text is supplied with the red button, which is the usual convention for an exit or release station.

Both are single gang plate mounted red mushroom releases, so they occupy the same wall opening class. The Dortronics 5211-MP23 head is 1-9/16 inches versus 1-5/8 inches on the Camden, a difference you will not notice on the wall. Exact plate dimensions for the Dortronics are not something to assume equal to the Camden's 4-1/2 x 2-3/4 inch plate, so check the plate itself if you are covering an existing cutout rather than a clean box.

Allow for 1-3/4 inches (44mm) of depth on the CM-400, and that same 1-3/4 inch depth applies to the narrow and wide plate versions too. That is the figure to check against a shallow box in a hollow metal frame or a furred out drywall chase.

It is a momentary switch. Pressing it makes contact only while held, then it springs back, so the door release signal is a pulse and the timing is set by whatever control board or timer the button feeds. If your application needs the contact to stay made, a momentary mushroom button is the wrong device.

Among the comparable exit switches, the SDC 420 Series is the one described as an illuminated push button exit switch with 2 inch buttons and code compliance. If your AHJ is citing a specific request to exit requirement on the drawing, that is the one to spec against. The Camden CM-400 is a commercial momentary mushroom switch rated 6 A @ 30 VDC with a vandal resistant free-spinning button.

The Camden CM-400 uses a heavy duty 18 gauge stainless steel faceplate in US32 / C32D finish and a free-spinning button specifically to resist vandalism, which suits high-traffic commercial openings. The SDC 430 Series is built as a heavy duty industrial mushroom button switch with a 1-1/2 inch round button, and the SDC 440 Series is a heavy duty design with a 2-5/8 inch mushroom. The difference is button size and whether you want the anti-vandal free-spin feature.

The plate is stainless steel in US32D / C32D, which is satin stainless. That is the standard finish used on commercial push plates, pulls and exit device trim, so it reads as a match alongside typical satin stainless door hardware.

It is built for commercial work: an 18 gauge stainless steel plate and a vandal resistant free spinning head, the sort of thing specified for schools, hospitals, offices and multi-family common areas rather than a house.