Camden CM-4000 Series 1-5/8" Green Mushroom Pushbutton Spring Return, DPST 1-60 sec Pneumatic Timer (ADA), Single Gang 'PUSH TO EXIT'

The button carries an integrated pneumatic time delay that is field adjustable from 1 to 60 seconds. Press the mushroom and the DPST contacts transfer, then the pneumatic head bleeds down and drops them out at the end of the set interval, so a maglock or strike stays released long enough for someone to get through the opening without any separate timer module in the circuit. The button itself is spring return, so it does not stay latched in.

No. At 4-1/2 x 2-3/4 inches, the single gang plate is too wide for a typical narrow storefront mullion or door stile. Camden builds the CM-4000 faceplate in a narrow width as well, and that is the version to specify for frame mounting. Another route is the SDC 410 Series illuminated exit switch, which is built specifically for narrow frame mount.

The Dortronics 5210 Series exit release, ordered as DRT5211-MP23, is the nearest single gang mushroom alternative: it is a 1-9/16 inch diameter red mushroom push button marked "Push to Exit"/"Emergency Release" mounted on a single gang plate. The Camden CM-4000 uses a 1-5/8 inch (40mm) free-spinning button on a 1/4 inch thick cast aluminum faceplate, with overall dimensions of 4-1/2 inch x 2-3/4 inch x 1-3/4 inch. The main difference for a locksmith is button color and marking: the Dortronics is supplied red, while the Camden is ordered green with PUSH TO EXIT engraving.

The CM-4000 green mushroom button is supplied on a single gang faceplate measuring 4-1/2 inch x 2-3/4 inch, which is wider than most glass front stiles will accept. For a narrow mullion or frame, the SDC 410 Series illuminated push button exit switch is built for narrow frame mount. Camden also builds the CM-4000 series faceplates in narrow widths, so a glass front installer can stay with the same 1-5/8 inch mushroom button by specifying the narrow plate rather than the single gang.

Yes. The SDC 440 Series is a large mushroom button emergency exit switch with a 2-5/8 inch diameter heavy duty design, and the SDC 420 Series uses 2 inch buttons. The Camden CM-4000 mushroom button is 1-5/8 inch (40mm) in diameter. If the drawing calls for a maximum-visibility emergency release, the larger SDC buttons give more strike area; the CM-4000 is the choice when you want the free-spinning vandal and tamper-resistant button with engraved wording on a 1/4 inch cast aluminum plate.

No. The time delay on the Camden CM-4000 is a mechanical feature of the button itself, ordered as the DPST 1-60 second integrated pneumatic timer, so the hold time is set at the device with no separate timer module in the circuit. The SDC comparables are switches described by their button and mounting style instead: the 410 Series is an illuminated push button exit switch for narrow frame mount, the 420 Series is an illuminated push button exit switch with 2 inch buttons and code compliance, and the 440 Series is a large 2-5/8 inch mushroom emergency exit switch. If your sequence of operation needs a 1 to 60 second unlock at the button, specify the CM-4000 pneumatic timer version.

Yes. The CM-4000 series is rated for indoor and outdoor use with an operating range of -13 F to 158 F (-25 C to 75 C), so a parking garage, loading dock, or exterior vestibule is within spec.

The switch is rated 100,000 cycles, and the 1-5/8 inch (40mm) button free-spins in its collar, which is what makes it vandal and tamper resistant: someone twisting or prying on it just spins the head rather than shearing the stem. Combined with the 1/4 inch cast aluminum plate, it holds up in corridors and public lobbies.

Spring return, like this one, is for momentary release: the door unlocks for the timed interval and then relocks by itself, which is what you want on a normal egress or accessible door operator. A push/pull or push/turn to release button holds the lock open until someone deliberately resets it, which suits a room that has to be held unsecured after an event. The CM-4000 series is built in all three operations, so the choice is made at order time.

Closest match is the Dortronics 5210 Series single gang mushroom, a 1-9/16 inch red button engraved Push to Exit or Emergency Release. From SDC, the 430 Series is a heavy duty industrial mushroom with a 1-1/2 inch round button, and the 440 Series steps up to a 2-5/8 inch mushroom for emergency release where you want an unmistakably large target. If you need the button lit, the SDC 410 Series is illuminated in a narrow frame mount for aluminum stiles, and the SDC 420 Series is an illuminated 2 inch button. Camden's 1-5/8 inch button sits between the SDC 430 and 440 sizes.

The SDC 430 Series is a heavy duty industrial mushroom button switch with a 1-1/2 inch round button, so it is the closest industrial-duty counterpart in button size to the Camden CM-4000, which uses a 1-5/8 inch button. Where the CM-4000 differs is environment and switching: it is rated for indoor and outdoor use from -13 F to 158 F (-25 C to 75 C), carries 6 A at 30 VDC, is rated 100,000 cycles, and can be ordered with an integrated pneumatic time delay, such as the DPST 1-60 second timer version.

Either will read as a red push to exit station. The Dortronics DRT5211-MP23 is supplied as a 1-9/16 inch red mushroom button marked "Push to Exit"/"Emergency Release" on a single gang plate. The Camden CM-4000 series is offered in red, blue or green, with black and yellow on request, and if no color is indicated red is supplied, so you can keep the same Camden series and plate across the portfolio and simply specify red instead of the green version. Both mount to a single gang opening.

It is a dry contact switch, not a networked device. There is no wireless or RF communication in it and no supply needed for the button itself, since the pneumatic timer is mechanical rather than electronic. You just run the two circuits back to the lock power or the access control panel.

Standard finish is brushed aluminum on a cast heavy duty aluminum plate, which lines up visually with the brushed aluminum and satin stainless wall plates and card readers used on most commercial openings.