MMTC 3B4X Exterior Three Button Control Station
The MMTC 3B4X is an exterior three-button surface-mount control station for OPEN, CLOSE, and STOP commands. It is used when a commercial door operator, gate operator, or industrial access system needs a field-mounted control point with all three standard command functions. The NEMA 4X Rosite enclosure helps protect the station in exterior and corrosion-prone environments, making it useful for exposed commercial openings, parking facilities, loading areas, coastal jobs, and industrial locations.
This station is not a standalone operator control. It is wired into the operator's control terminals and must match the control-board logic. The OPEN and CLOSE buttons are typically momentary command inputs, while the STOP circuit often has different contact requirements depending on the operator. That is why the existing wiring diagram and terminal labels should be checked before replacing an older station.
The 3B4X is commonly chosen when a basic three-button station is needed outside, but the job calls for a corrosion-resistant NEMA 4X enclosure rather than an indoor NEMA 1 station or a standard exterior NEMA 4 metal box. If the existing station includes lockout, stainless steel housing, protective cover, or a different button layout, compare the exact MMTC part number before ordering.
Compatible With
This product is commonly used with the following applications when the operator control circuit, wiring terminals, enclosure needs, and site layout match the part being replaced or added:
- Commercial overhead door operators with separate low-voltage OPEN, CLOSE, STOP, and COMMON terminals, when the button functions match.
- Automatic gate operators and access control panels that accept momentary dry-contact command inputs, when the circuit design supports a remote control station.
- Industrial door, rolling door, grille, parking, and service-door control circuits that require a surface-mount field station.
- Replacement applications where the original MMTC control station uses the same button count, enclosure rating, mounting style, contact arrangement, and wiring layout.
- Commonly associated with operator brands that use external three-button stations, including LiftMaster, Linear, Genie, Overhead Door, Manaras, DoorKing, HySecurity, and similar commercial operator platforms, when confirmed by the wiring diagram.
- OPEN-CLOSE-STOP control stations for commercial overhead doors, rolling doors, grilles, and gate operators.
- Exterior field stations where NEMA 4X corrosion resistance is required and a lockout key switch is not needed.
Because control stations and accessory devices are wired into the operator control circuit, verify the terminal labels, contact type, voltage rating, enclosure rating, and required command functions before ordering.
Features and Specifications
| Manufacturer | MMTC |
|---|
| Product Type | Exterior three button surface mount control station |
|---|
| Part Number | 3B4X |
|---|
| Button Function | OPEN-CLOSE-STOP |
|---|
| Enclosure Rating | NEMA 4X |
|---|
| Enclosure Material / Style | Rosite enclosure |
|---|
| Button Layout | Triangular pattern |
|---|
| Mounting Style | Surface mount |
|---|
| Dimensions | H=4-1/4 in, W=4-1/4 in, D=2-1/2 in |
|---|
| Application | Commercial door and gate operator command station |
|---|
| Notes | Match STOP circuit wiring to the operator diagram. |
|---|
Also Known As / Related Part Numbers
- MMTC 3B4X
- 3B4X
- MMTC-3B4X
- NEMA 4X three button control station
- Exterior OPEN-CLOSE-STOP control station
- Related: 3BX, 3BXT, 3B4X-SS, 3B4XL, 3BXL
Technician Note
The 3B4X is a good choice when the job needs exterior OPEN-CLOSE-STOP control without keyed lockout. Check the STOP circuit carefully because some operators require a normally closed stop loop.
Before Ordering Checklist
- Match the MMTC part number and button function to the existing station or wiring diagram.
- Confirm whether the site needs two-button OPEN-CLOSE or three-button OPEN-CLOSE-STOP control.
- Verify enclosure type: interior NEMA 1, exterior NEMA 4, exterior/corrosion-resistant NEMA 4X, or specialty enclosure.
- Confirm contact requirements, especially normally open command buttons and normally closed stop circuits where applicable.
- Check mounting space, conduit entry, back box, and whether a lockout/keyed function is required.
Professional Advisory
Installation should follow the operator manufacturer's wiring diagram and all applicable safety requirements. Do not bypass stop circuits, monitored safety devices, entrapment protection, or required warning devices. If the operator uses high voltage wiring or the control circuit is not clearly identified, have the work performed by a qualified gate or commercial door technician.
Product Questions and Answers
What does the MMTC 3B4X control?
It provides OPEN, CLOSE, and STOP push-button commands to a compatible commercial door or gate operator control circuit.
Is 3B4X a NEMA 4X unit?
Yes. The 3B4X uses a NEMA 4X Rosite enclosure for exterior and corrosion-resistant applications.
Does this version include lockout?
No. The 3B4X is the non-lockout version. For a keyed lockout version, compare with 3B4XL or the exact station specified by the job.
Can it replace a 3BX station?
Only if the enclosure rating, dimensions, wiring, and contact requirements are acceptable. 3BX and 3B4X are related exterior three-button stations, but the enclosure construction is different.
What should be checked before wiring it?
Verify OPEN, CLOSE, STOP, and COMMON terminals, and confirm whether the STOP input is normally closed or requires a jumper through the control station.
