Miller Edge PS-20A Black Pneumatic Switch in ABS Weather-proof Enclosure
The Miller Edge PS-20A pneumatic edge switch is the control-side switch used in many non-monitored pneumatic sensing edge systems. When the connected hose or air bladder is compressed, air pressure moves the diaphragm in the switch and changes the electrical contact state.
This switch is housed in a black ABS enclosure with screw-tab mounting and can be configured for normally open or normally closed output. It is commonly used with pneumatic configured sensing edges, treadles, and signaling hoses on older commercial door and gate applications.
Compatible With
- Miller Edge pneumatic configured sensing edges up to 18 ft.
- Miller Edge pneumatic configured treadles
- Signaling hoses on floors using a compatible pneumatic switch arrangement
- PS20K500 pneumatic edge kit family including PS20K500-12, PS20K500-12C, PS20K500-18, and PS20K500-18C
- RAH-375, RAH-500, and RAH-750 gum rubber air hose when the correct plugs, adapters, and fittings are used
- HRH-375 hard rubber hose as a connection hose in compatible pneumatic edge assemblies
- Commercial sectional doors, rolling doors, coiling grilles, sliding doors, and similar motorized door applications originally designed for non-monitored pneumatic safety edges
- Pre-2010 commercial door operators, pre-2016 gate operators, and approved secondary entrapment protection applications where non-monitored pneumatic edges are allowed
- Not a direct replacement for AW10, AW12A, AW14, AW14-RF, PS20-RF, monitored 10K edges, or wireless monitored gate edge receivers
Features & Specifications
| Manufacturer | Miller Edge |
|---|
| Product Type | Pneumatic edge switch |
|---|
| Part Number | PS-20A |
|---|
| Application | Non-monitored pneumatic sensing edge, treadle, and signaling hose systems |
|---|
| Detection Technology | Pneumatic pressure |
|---|
| Output | Normally open and normally closed |
|---|
| Electrical Configuration | 2-wire N.O. and N.C. |
|---|
| Maximum Contact Load | 5 amps at 250 VAC |
|---|
| Maximum Pressure | 20 PSI |
|---|
| Maximum Switch Frequency | 25 per second |
|---|
| Maximum Edge Length | 18 ft. |
|---|
| Operating Temperature | -4 deg F to 158 deg F (-20 deg C to 70 deg C) |
|---|
| Dimensions | 2 in. W x 4-7/8 in. H x 2 in. D |
|---|
| Weight | 3.15 oz. |
|---|
| Housing Material | ABS |
|---|
| Degree of Protection | NEMA 12 |
|---|
| Monitoring Type | Non-monitored |
|---|
Also Known As / Related Part Numbers
- PS-20A
- PS20A
- PS 20A
- Miller Edge pneumatic switch
- Miller Edge pneumatic edge switch
- PS20A switch in ABS enclosure
- PS20K500 related switch component
Technician Note
The PS-20A can provide N.O. or N.C. operation, but the operator input and wiring must match the original setup. Do not assume that a pneumatic switch can replace a monitored edge module or a resistor-based sensing edge without reviewing the operator manual and safety input requirements.
Before Ordering Checklist
- Confirm the old switch is PS-20A, PS20A, or the same pneumatic switch style.
- Confirm the edge length is within the 18 ft. pneumatic switch limit.
- Check whether the control input expects N.O. or N.C. operation.
- Confirm the hose, plug, and fitting sizes match the existing pneumatic edge.
- Inspect the pneumatic hose for leaks, cracks, blocked lines, or missing end plugs.
Professional Advisory
Pneumatic switches connect to door or gate operator safety circuits. Electrical troubleshooting and safety-device wiring should be handled by a qualified technician if there is any uncertainty about the input type, voltage, or required monitored protection.
Product Questions & Answers
Q: What does the Miller Edge PS-20A do?
A: The PS-20A converts air pressure from a pneumatic edge, hose, or treadle into an electrical contact that can signal a compatible operator to stop and/or reverse.
Q: Is the PS-20A normally open or normally closed?
A: The PS-20A supports normally open and normally closed operation when it is connected and adjusted for the intended control input.
Q: What edge length can the PS-20A support?
A: The PS-20A is listed for Miller Edge pneumatic configured sensing edges up to 18 ft.
Q: Is PS-20A monitored?
A: No. The PS-20A is a non-monitored pneumatic switch and is not a substitute for monitored entrapment protection on operators that require it.
Q: Can PS-20A be used outdoors?
A: It has an ABS enclosure and a NEMA 12 rating, but the complete installation must be protected and installed according to the door or gate environment.
