ROFU 9400 SPDT 1-1/2" Red Mushroom Buttons, 3A/240V

The 9400 REX switch comes on two plate sizes: a standard plate at 4-3/4 x 3 x 1/4 inches and a narrow plate at 4-3/4 x 1-5/8 x 1/4 inches. The narrow plate is the one to use on a mullion or a narrow stile where there isn't 3 inches of flat face to land the standard plate. Both are 1/4 inch thick aluminum.

It depends on what the button is wired into. Normally open is the usual choice for a request-to-exit input on an access control panel or for triggering a mag lock relay, since the circuit closes only when the button is pressed. Normally closed is what you want when the button sits in series in a mag lock power run and pressing it has to break the circuit to drop the lock. The 9400 is offered in NO and NC, and both are SPDT switches rated 3A at 240V.

Momentary means the contact changes state only while the button is held and springs back the instant it is released, which is what a normal exit push needs. Maintained means the button latches in the pressed position and stays there until someone pushes it back, so the door stays unlocked until it is reset. Order maintained where you want a hold-open or a lockdown-style latch, momentary everywhere else. The 9400 comes in all four combinations: NO-Momentary, NC-Momentary, NO-Maintained and NC-Maintained.

The 9400 switch is rated 3A at 240V, so it will carry a typical 12V or 24V mag lock load directly in a break-the-circuit NC configuration without an interposing relay. Check the draw of the lock you are feeding against that 3 amp figure. Because it is SPDT, you also have both a normally open and a normally closed contact off the same button, so one device can drop a lock and signal a panel at the same time.

The Detex PB-2100 series push button control is the nearest peer. Both are single-gang push button exit controls wired through changeover contacts: the ROFU 9400 is an SPDT device, and the Detex PB-2138-3 carries Form C terminals, which is the same changeover arrangement, so either can be wired normally open or normally closed at the terminal block. The practical difference is the actuator treatment. The ROFU 9400 uses an exposed 1-1/2 inch red mushroom button behind a 1/4 inch thick tamper-resistant aluminum cover plate secured with two snake eyes security screws, while the Detex PB-2138-3 button is fitted with a shroud around the actuator.

Not on that point. The ROFU 9400 is ordered by mode, in NO-Momentary, NC-Momentary, NO-Maintained and NC-Maintained configurations, so a maintained button that latches in the pressed state until pressed again is a catalog selection on the 9400 itself. The Detex PB-2138-3 is a push button control with Form C terminals, and Form C describes the contact arrangement rather than whether the actuator latches. Where the sequence of operation on the drawing calls for a maintained contact holding a door unlocked, specify the ROFU 9400 in the NO-Maintained or NC-Maintained mode and the finish, US28 satin aluminum or US40 dark anodized bronze.

Stay within the ROFU 9400 family and take the narrow plate. The 9400 is supplied in a standard plate at 4-3/4 inches by 3 inches by 1/4 inch and a narrow plate at 4-3/4 inches by 1-5/8 inches by 1/4 inch, and the narrow version is the one that lands on a storefront mullion face without overhanging the glazing stop. Both carry the same 1-1/2 inch red mushroom button and the same 3A at 240V rating, so the electrical design does not change when you move to the narrow plate. The Detex PB-2138-3 push button control is shrouded, which adds depth and width at the actuator, so it is the less likely fit on a narrow stile.

The cover plate is 1/4 inch thick aluminum and it fastens with two snake eyes security screws, which need the spanner wrench that ships with the switch rather than a screwdriver anyone carries. That is the tamper-resistant construction you want on a public-side or high-traffic opening. The mushroom head itself is a 1-1/2 inch red button, large enough to hit with an elbow or a gloved hand.

No, they're in the box. Every 9400 REX switch ships with two snake eyes security screws and the wrench to drive them. What is not included is the back box or ring, so plan on a single gang box or mullion cutout behind the plate.

Two finishes: US28 satin aluminum and US40 dark anodized bronze. US28 matches clear anodized aluminum storefront and most commercial door frames; US40 is the one for dark bronze anodized entrances. Finish has to be specified when ordering, and both finishes are available across all four switch modes.

Both are wall-mounted push button controls for access control openings. The ROFU 9400 is a 1-1/2 inch red mushroom head on a 1/4 inch aluminum plate, SPDT, 3A/240V, ordered as NO or NC in momentary or maintained. The Detex PB-2100 Series is a push button control supplied with a shroud and Form C terminals; the shroud is the difference to weigh, since it guards against a button being struck accidentally in a tight corridor. If a large, easy-to-hit head is the point, the mushroom button is the one; if you need the button protected from a cart or a shoulder, look at the shrouded Detex.

Between the two, the Detex PB-2138-3 is the one built with a shroud surrounding the push button, so the actuator sits recessed behind a guard rather than proud of the plate. The ROFU 9400 presents a 1-1/2 inch red mushroom button on the face of a 1/4 inch thick aluminum cover plate, which is the larger and faster target to hit deliberately, including with a gloved hand or a forearm. In a tight corridor where carts and gurneys pass close to the wall, the shrouded Detex reduces incidental actuation; where the priority is an unmistakable, quickly located exit control, the exposed ROFU mushroom head serves that.

For a bronze-matched exit button, the ROFU 9400 is specified in US40 dark anodized bronze, and in US28 satin aluminum for clear-anodized openings. Finish is a required selection when ordering the 9400, chosen alongside the contact mode, so a building standardizing on dark bronze exit devices can carry the same button at every opening. The Detex PB-2138-3 is a shrouded push button control in the 2100 series.

Yes. The ROFU 9400 REX switch is rated 3A at 240V and its components are UL Recognized, so a 2 amp load at 120V sits inside the contact rating and the button can be wired in line rather than through an interposing relay. The switch is SPDT, so the same device gives you both a normally open and a normally closed path off one actuation if the panel needs a second signal. The Detex PB-2138-3 push button control uses Form C terminals for its changeover connection.

Yes, and that's a good reason to pick this family. The same plate, the same 1-1/2 inch mushroom head and the same two finishes carry across all four switch configurations, so a maintained NO button at a loading door and a momentary NC button at a stair door look identical from the corridor. Eight orderable combinations total, from two finishes and four modes.