The Miller Edge MWRTA12B is a single-channel, non-monitored wireless sensing-edge system for select motorized commercial doors and automated vehicular gates. The kit combines an MWR12B receiver with an MWTA12B transmitter featuring an audible low-battery alarm.
The MWTA12B mounts near the moving sensing edge and transmits edge-activation signals to the MWR12B receiver. This eliminates the moving coil cord, retracting reel, or hard-wired connection that would otherwise run between the sensing edge and operator.
The MWTA12B transmitter connects to a compatible 2-wire normally open sensing edge. When the edge is compressed, its contact closes and the transmitter sends a 318 MHz wireless signal to the MWR12B receiver.
The receiver then changes its normally open or normally closed relay output so the connected operator can provide its programmed stop or reverse response. The receiver includes power and relay-status indicators for setup and troubleshooting.
The sensing edge, receiver mounting hardware, operator connection wire, antenna coax, bulkhead adapter, and installation tools are not included.
Exact operator compatibility depends on the manufacturer, complete model number, production date, control-board generation, required N.O. or N.C. input, and current operator manual.
The MWR12B is a single-channel receiver designed to operate with one compatible MWT12B or MWTA12B transmitter. The receiver and transmitter coding switches must be set to matching patterns.
The MWR12B is normally supplied as part of the MWRT12B or MWRTA12B complete system and is not currently listed by Miller Edge as a separately sold receiver.
The MWR12B receiver provides normally open and normally closed relay output options. The receiver common and selected output wire must be connected to the operator input specified by the operator manufacturer.
A terminal labeled EDGE, SAFETY, REVERSE, N.O., N.C., or COMMON does not automatically confirm compatibility. The operator must permit a non-monitored dry-contact device for the intended function.
The MWTA12B transmitter includes an audible alarm that activates when approximately 25 percent of battery power remains. Miller Edge rates the alarm at approximately 80-95 dB measured at 2 feet.
Battery life varies with temperature, activation frequency, battery age, storage conditions, and alarm operation. Replace both batteries as a matched pair and observe the marked polarity.
MWRTA12B is a non-monitored system. It does not provide 10K resistance, 8.2K resistance, diode-capacitor monitoring, pulsed monitoring, wireless supervision, or proprietary monitored communication.
Miller Edge generally identifies this product family for non-monitored commercial door operators manufactured before August 2010, non-monitored automated vehicular gate operators manufactured before January 2016, or secondary detection where permitted.
These dates are general product-selection guidelines and do not guarantee compatibility. Never use MWRTA12B to bypass a monitored safety input or replace required monitored entrapment protection.
Current MWRTA12B systems manufactured after April 2024 use a 9-pole, 2-position binary coding switch. Earlier MWRTA12 systems used a 3-position trinary coding switch and are identified as discontinued.
Miller Edge permits binary and trinary equipment to communicate when the coding switches are mapped according to the current addendum. Additional setup is required, so the current B-suffix system should not be represented as a direct plug-and-play replacement for every older MWRTA12 installation.
| Specification | Details |
|---|---|
| Brand | Miller Edge |
| System Part Number | MWRTA12B |
| Product Type | Single-channel non-monitored wireless sensing-edge system |
| Receiver | MWR12B single-channel receiver |
| Transmitter | MWTA12B with audible low-battery alarm |
| Required Edge Input | 2-wire normally open, non-monitored sensing edge |
| Receiver Channels | 1 |
| Transmitters Per Receiver | 1 compatible transmitter |
| Receiver Outputs | Normally open and normally closed relay contacts |
| Frequency | 318 MHz |
| Operating Range | Up to 100 feet under optimal conditions |
| System Response Time | Approximately 70 milliseconds |
| Coding | Selectable 9-pole, 2-position binary DIP switch |
| Receiver Power | 12-24 VAC/DC nominal |
| Published Receiver Current | 60 mA nominal and 140 mA activated |
| Transmitter Batteries | Two AA 1.5V lithium batteries |
| Expected Battery Life | Approximately 2 years under normal conditions |
| Low-Battery Alarm Threshold | Approximately 25 percent battery power remaining |
| Alarm Sound Level | Approximately 80-95 dB at 2 feet |
| Operating Temperature | 0 F to 130 F |
| Receiver Indicators | Power and channel/relay status LEDs |
| Transmitter Indicator | Green transmit and test-status LED |
| Receiver Antenna | Attached wire antenna or F-connector external antenna connection |
| Receiver Wiring | Integral 18-inch wiring with #6 spade lugs |
| Receiver Dimensions | Approximately 3-3/4 inches wide x 4-13/16 inches high x 1-1/4 inches deep |
| Receiver Weight | Approximately 4.6 ounces |
| Receiver Enclosure | Polycarbonate; no NEMA rating published in the current specification table |
| Transmitter Dimensions | Approximately 1-13/16 inches wide x 5-3/4 inches high x 2-1/8 inches deep |
| Transmitter Weight | Approximately 7.2 ounces |
| Transmitter Enclosure | NEMA 4 polycarbonate |
| Agency Compliance | FCC Part 15 |
| Manufacturer Warranty | 2 years from shipment, subject to Miller Edge warranty terms |
The advertised 100-foot range applies only under optimal conditions. Metal doors, gate frames, operator cabinets, structural steel, nearby 318 MHz equipment, antenna placement, and lack of clear line of sight can reduce usable range.
Place the receiver antenna outside metal enclosures and in line of sight with the transmitter throughout the complete door or gate travel. The transmitter strain-relief fitting should point downward in damp or outdoor applications.
Do not drill or modify the NEMA 4 transmitter enclosure. Modification can reduce environmental protection and void the manufacturer warranty.
Disconnect operator power before wiring the receiver. Installation, coding, edge connection, antenna placement, receiver wiring, and final testing must follow current Miller Edge instructions and the operator manufacturer manual.
Never bypass a monitored safety input, jumper an entrapment-protection circuit, or use MWRTA12B to conceal a sensing-edge fault. Test the sensing edge near both ends and at the center after installation and during regular maintenance.
A qualified commercial door, gate, garage door, or low-voltage technician should complete the work when the coding generation, receiver output, operator input, antenna setup, or required safety configuration is unclear.
The kit includes one MWR12B single-channel receiver, one MWTA12B transmitter with low-battery alarm, two AA 1.5V lithium batteries, and four transmitter mounting screws.
The MWTA12B transmitter requires a 2-wire normally open, non-monitored sensing edge. It is not intended for 10K, DC/T3, pulsed, or other monitored edge configurations.
No. MWRTA12B is non-monitored and must not replace supervised entrapment protection when the operator requires a monitored safety device.
The receiver provides normally open and normally closed relay output options. Use only the output approved for the exact operator and control-board generation.
The audible alarm activates when approximately 25 percent battery power remains. Miller Edge rates the alarm at approximately 80-95 dB measured at 2 feet.
The system may operate up to 100 feet under optimal conditions. Metal enclosures, structural steel, antenna placement, and radio interference can reduce actual range.
MWRTA12B uses current 2-position binary coding, while the discontinued MWRTA12 uses 3-position trinary coding. Mixed-generation operation requires additional coding setup, so it is not a direct plug-and-play replacement.
Miller Edge identifies the MWR12B as the single-channel receiver supplied in MWRT12B and MWRTA12B kits and states that it is not sold separately.