MMTC 3EBX Explosion Proof Three Button Control Station
The MMTC 3EBX is a specialty three-button surface-mount control station with an explosion-proof style metal enclosure. It provides OPEN, CLOSE, and STOP button functions for compatible operator control circuits where this specific type of enclosure has been specified. It is different from a standard exterior NEMA 4 station and should be ordered only when the job drawings, original part, or equipment documentation call for this type of control station.
The MMTC literature for 3EBX identifies it as a NEMA 7 and 9 explosion-proof enclosure with OPEN-CLOSE-STOP control, normally open OPEN and CLOSE contacts, and a normally closed STOP contact. That STOP contact difference is important because many commercial operators rely on a closed stop circuit for normal operation. A mismatch can keep the operator from running or create unsafe control behavior.
This is a high-importance fitment item. Explosion-proof wording is often used loosely in the field, but the station still must be verified against the actual hazardous-location requirements, control voltage, contact rating, conduit fittings, and site authority requirements. MMTC documentation includes a disclaimer that their explosion-proof push buttons are not rated by division or class, so do not use this part as a substitute for engineering review where hazardous-location classification applies.
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 door and gate operator control circuits requiring an OPEN-CLOSE-STOP surface-mount station with matching contact logic.
- Specialty industrial control locations where a 3EBX-style NEMA 7 and 9 enclosure is specified by the original equipment documentation or job drawings.
- Replacement for matching MMTC 3EBX installations when the enclosure type, button count, and contact arrangement match.
- Systems requiring normally open OPEN and CLOSE command contacts with a normally closed STOP contact, when confirmed by the operator wiring diagram.
- Related NEMA 7/9 MMTC control station family applications, including 1EBX and 2EBX style stations, when selecting by button count.
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 | Explosion proof style three button surface mount control station |
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| Part Number | 3EBX |
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| Button Function | OPEN-CLOSE-STOP |
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| Enclosure Rating | NEMA 7 and 9 style enclosure |
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| Enclosure Material / Style | Metal enclosure |
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| Mounting Style | Surface mount |
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| Dimensions | H=6-1/8 in, W=3 in, D=4-3/8 in |
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| Contact Notes | OPEN normally open, CLOSE normally open, STOP normally closed per MMTC wiring reference |
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| Contact Rating | 6 amp at 125 VAC per MMTC wiring reference |
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| Application | Specialty commercial and industrial operator control circuits |
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| Important Note | Explosion-proof push buttons may not be rated by division or class; verify project requirements. |
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Also Known As / Related Part Numbers
- MMTC 3EBX
- 3EBX
- MMTC-3EBX
- NEMA 7 and 9 three button station
- Explosion proof OPEN-CLOSE-STOP station
- Related: 1EBX, 2EBX, CP-2X
Technician Note
Treat 3EBX as a specialty control station. Confirm the STOP contact and hazardous-location requirements before ordering, especially if the existing station failed or the site has classified-location requirements.
Before Ordering Checklist
- Match the exact 3EBX part number or the original station documentation.
- Confirm whether the STOP circuit must be normally closed.
- Verify the control voltage and contact rating.
- Confirm enclosure and conduit requirements for the site.
- Do not rely on appearance alone for hazardous-location applications.
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
Is the MMTC 3EBX a standard outdoor station?
No. It is a specialty NEMA 7 and 9 style three-button station and should not be treated the same as a standard NEMA 4 or NEMA 4X outdoor station.
What are the contact functions?
MMTC wiring information identifies OPEN and CLOSE as normally open contacts and STOP as a normally closed contact.
Can 3EBX be used in any hazardous location?
No. The project classification, authority requirements, conduit method, and MMTC rating information must be verified. MMTC documentation includes a division/class disclaimer.
What operators can it work with?
It can work with compatible commercial door or gate operators that accept matching OPEN, CLOSE, STOP, and COMMON control wiring.
What related parts should be compared?
Compare 1EBX for one-button, 2EBX for two-button, and 3EBX for OPEN-CLOSE-STOP three-button applications.
