Miller Edge MWRTA12 12/24V AC/DC 1-Channel Transmitter with Alarm and Receiver
The Miller Edge MWRTA12 is the alarm-transmitter version of the legacy single-channel MW wireless edge system. It is used to send a 2-wire non-monitored sensing edge signal wirelessly to the operator receiver, while the MWTA12 transmitter provides a low battery alarm feature.
This kit is used in gate and commercial door applications where the operator accepts a non-monitored edge input. The alarm is for transmitter battery condition; it is not a warning horn for every edge activation. Confirm generation, programming, and safety requirements before replacing or mixing components.
Features and Specifications
| Manufacturer | Miller Edge |
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| Part Number | MWRTA12 |
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| Product Type | Single-channel wireless sensing edge kit with low battery alarm transmitter |
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| Application | Non-monitored wireless edge signal for gates and commercial doors |
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| Kit Components | MWR12 receiver and MWTA12 transmitter with low battery alarm, verify current package contents |
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| Frequency | 318 MHz |
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| Receiver Voltage | 12-24 VAC/DC nominal |
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| Output | N.O. and N.C. receiver relay contacts |
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| Transmitter Input | 2-wire N.O. non-monitored sensing edge |
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| Low Battery Alert | MWTA12 audible alarm, commonly listed as 80-95 dB at 2 ft |
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| Operating Range | Up to 100 ft under optimal conditions |
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| Transmitter Enclosure Rating | NEMA 4 |
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| Notes | Legacy / discontinued MW kit; verify battery type and generation by label and instructions |
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Compatible With
- Miller Edge 318 MHz MW wireless sensing edge systems.
- Commercial motorized door operators using a non-monitored safety edge input.
- Automated vehicular gate operators using a non-monitored safety edge input.
- Older commercial door operators manufactured before August 2010 when a non-monitored edge system is allowed by the operator and site requirements.
- Older automated gate operators manufactured before January 2016 when a non-monitored edge system is allowed by the operator and site requirements.
- Miller Edge 2-wire, non-monitored, normally open sensing edges, sold separately.
- Applications requiring dry contact N.O. or N.C. receiver output to the operator control board.
- Not intended as a substitute for a monitored sensing edge system where monitored entrapment protection is required.
- MWR12 single-channel receiver.
- MWTA12 wireless sensing edge transmitter with low battery alarm.
- Related MWRT12 kit when no low battery alarm transmitter is required.
- Pre-April 2024 trinary 9-pole, 3-position DIP switch Miller Edge MW systems.
- Current MWRTA12B systems are related current-generation versions; verify programming and part generation before substitution.
Also Known As / Related Part Numbers
- MWRTA12
- MWRTA-12
- MWRTA 12
- Miller Edge MWRTA12 kit
- MWR12 and MWTA12 kit
- wireless edge kit with alarm
- 318 MHz wireless edge kit with low battery alarm
- Legacy MWRTA12
- MWRTA12B related current kit
Technician Note
The MWTA12 alarm indicates low transmitter battery condition. It should not be described as an obstruction alarm or an operator warning device. Always test edge activation at the operator after battery replacement or transmitter service.
Before Ordering
- Match the Miller Edge wireless generation: pre-April 2024 trinary DIP components and current binary DIP components may require additional programming when mixed.
- Verify the job requires a non-monitored 2-wire sensing edge system, not a monitored edge interface.
- Confirm the operator provides 12-24 VAC/DC low-voltage power for the receiver.
- Confirm the receiver output needed by the operator: normally open or normally closed.
- Keep the receiver antenna outside metal enclosures or use the proper remote antenna accessory if signal range is weak.
- Check all safety devices after installation and test that the door or gate stops and reverses properly.
- Confirm whether the site needs the alarm transmitter version or the standard MWT12 version.
- Verify the correct battery type from the transmitter label or instructions supplied with the product.
Professional Advisory
Wireless edge systems must be installed and tested as safety devices, not as simple accessory relays. For high-voltage operator panels, monitored safety requirements, missing entrapment protection, or unreliable gate movement, use a qualified gate or commercial door technician.
Product Questions and Answers
What does the alarm do on MWRTA12?
The alarm is a low battery alert for the MWTA12 transmitter. It is not intended to sound every time the sensing edge is compressed.
What is included with MWRTA12?
MWRTA12 is commonly identified as a kit with an MWR12 receiver and an MWTA12 transmitter with a low battery alarm. Verify current package contents when ordering.
Is MWRTA12 a monitored wireless edge system?
No. MWRTA12 is a non-monitored wireless edge system and should not be substituted for a required monitored edge system.
What frequency does MWRTA12 operate on?
MWRTA12 is part of the Miller Edge 318 MHz MW wireless edge family.
Can I use an MWRTA12 transmitter with an MWR13 receiver?
The MWTA12 transmitter is commonly associated with both MWR12 single-channel systems and MWR13 multi-channel systems when the generation and programming are matched.
