MMTC 3B4XL Exterior Three Button Lockout Control Station
The MMTC 3B4XL is a NEMA 4X exterior three-button control station with lockout. It gives the operator OPEN, CLOSE, and STOP command buttons while adding a keyed lockout function to help restrict use of the station when access should be limited. The Rosite NEMA 4X enclosure makes it suitable for exterior and corrosion-prone locations where a basic interior or standard metal station is not the best choice.
This part is commonly used on commercial door, gate, and industrial access systems that need a local control station at the opening, loading area, security gate, or equipment room. The lockout feature is useful where only authorized users should operate the station or where a service lockout function is part of the site's operating procedure. It does not eliminate the need for proper disconnects or lockout/tagout practices during electrical service.
The 3B4XL should be matched carefully to the original station or wiring diagram. Three-button lockout stations can look similar, but the enclosure rating, button pattern, lock type, contact configuration, and mounting style may differ. Do not substitute it for a non-lockout model or a different cylinder version unless the job requirements allow that change.
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.
- Exterior OPEN-CLOSE-STOP control applications where a keyed lockout function is required.
- Commercial door and gate systems where station use must be restricted at the local control point.
- Replacement for matching 3B4XL-style installations when the NEMA 4X Rosite enclosure and lockout configuration match.
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 |
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| Product Type | Exterior three button surface mount control station with lockout |
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| Part Number | 3B4XL |
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| Button Function | OPEN-CLOSE-STOP with lockout |
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| Enclosure Rating | NEMA 4X |
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| Enclosure Material / Style | Rosite enclosure |
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| Button Layout | Triangular pattern |
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| Mounting Style | Surface mount |
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| Dimensions | H=4-1/4 in, W=4-1/4 in, D=2-1/2 in |
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| Application | Commercial door and gate operator command station |
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| Notes | Lockout function must match the original station and site control requirements. |
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Also Known As / Related Part Numbers
Technician Note
The lockout feature is the key difference. If the existing control station does not have lockout, or uses a different cylinder/lockout arrangement, verify the wiring and authorization requirement before substitution.
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.
- Confirm the lockout requirement and cylinder/keying expectations before ordering.
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 lockout do on the 3B4XL?
The lockout function is used to restrict or disable operation from that local station, depending on how it is wired into the operator control circuit.
Is 3B4XL the same as 3B4X?
No. The 3B4XL includes lockout. The 3B4X is the related non-lockout three-button NEMA 4X station.
Can the lockout replace electrical lockout/tagout?
No. A station lockout is not a substitute for proper electrical disconnect, service procedures, or lockout/tagout where required.
Where is this station commonly installed?
It is commonly used outdoors at commercial doors, loading areas, gate entrances, industrial equipment areas, and similar locations needing local OPEN-CLOSE-STOP control.
What should be matched on replacement?
Match the MMTC part number, enclosure rating, lockout function, button count, contact style, and mounting dimensions.
