As an easy guide for you we have created these simple cross reference guides to help you compare our lines of adjustable pressure and vacuum switches, but also find switch part you need. If you have one of the part numbers listed below, simply match it to our part number.
Presair designs and manufactures adjustable pressure and vacuum switches. Presair switches are UL and CUL Recognized. All switches are made in the United States. All of our switches are 100% tested with a 100,000+ cycle life. Our direct customer service would be happy to help you find the right switch for your application.
With our field-adjustable pressure switches, our customers are provided with the flexibility to easily adjust their switch parameters on-site. Each of these switches have pressure options ranging from 0.25 inches of water gauge to 125 psig. Our adjustable pressure and vacuum switch products have various pressure connects, mountings, and electrical ratings available. With the customization capabilities of our compact switches, they also meet the needs of original equipment manufacturers and instrument makers for a low-cost, stable, and repeatable switch. They are made with acetal plastic to minimize the amount of moisture absorption and maintain dimensional stability. All switches are 100% tested at high and low settings, and at the proof temperature before leaving the shop. Units are delivered with setpoint at the low end of the adjustable range, and can easily be adjusted in the field using a hex head screw at the center of the pressure switch.
CUSTOM PRESSURE & VACUUM SWITCHES
Custom pressure and vacuum switches are available. Custom options include factory setting at specified set point and DPDT switches can be configured for different pressure settings.
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Cross-Reference Guides
Adjustable Pressure Switch Cross-Reference
| Manufacturer | Presair | Tecmark | Herga | Lefoo |
| Product Name | P Series | 3000, 3900, 4000, VTBS3000, V4000 | 6731, 6732, 6741 & 6742 Series | LF25 |
| Mounting Styles & Air Connections | 1/8 NPT, 9/16″-18 UNF Thread Mount w/ 1/8 NPT, 1/4 NPT, Radial Mount with Side Air Spout, Direct Mount with Center Air Spout | 1/8” NPT male, 1/4” NPT male, 3/16” barbed, 1/8”, 3/16” or 1/4” compression | 1/5″ (5.08mm), 1/8″ BSPT / NPT BRASS | NPT 1/8-27 or NPT 1/4-18 male, G 1/8 male |
| Construction | Plastic | Plated Steel, Plastic | Plastic, Steel, Brass | Plastic, Steel Plating |
| Diaphragm Material Options | Nitrile, EPDM, Silicone | Nitrile, EPDM | Urethane | Nitrile, EPDM, FVMQ |
| Function | Open or Close on Pressure Rise or Fall | Open or Close on Pressure Rise or Fall | Open or Close on Pressure Rise or Fall | Open or Close on Pressure Rise or Fall |
| Pressure Range | 2.50 inches of water to 125 PSI | 2″WC to 100 PSI | 1.50 inches of water to 120 PSI | 3 psi to 130 [so |
| Max. Proof Pressure | 200 PSI | 120 PSI | 150 PSI | 145 psi |
| Contact Configuration | Single Pole, Single Throw (SPST); Single Pole, Double Throw (SPDT); Double Pole, Double Throw (DPDT) | SPST, SPDT, DPST, or DPDT | SPST, DPDT | SPST OR SPDT |
| +100,000 Max. Resistive Cycle Rating @120VAC | 25 Amps | 25 Amps | 21A | 16A |
| Certifications | UL, cUL RoHS & REACH Compliant | UL, cUL RoHS & REACH Compliant | UL(508 Specific models only), RoHS & REACH | UL, CUL, RoHS REACH |
| Country of Origin | USA | USA | UK | China |
Adjustable Vacuum Switch Cross-Reference
| Manufacturer | Presair | Tecmark | Herga | Lefoo |
| Product Name | V Series | V4000 | HPS-600-V | LFS-01 |
| Mounting Styles & Air Connections | 1/8 NPT, 9/16″-18 UNF Thread Mount w/ 1/8 NPT, 1/4 NPT, Radial Mount with Side Air Spout, Direct Mount with Center Air Spout | 1/8” NPT male, 1/4” NPT male, 3/16” barbed, 1/8”, 3/16” or 1/4” compression | 1/5″ (5.08mm), 1/8″ BSPT / NPT BRASS | NPT 1/8-27 or NPT 1/4-18 male, G 1/8 male |
| Construction | Plastic | Plated Steel, Plastic | Plastic, Steel, Brass | Plastic, Steel Plating |
| Diaphragm Material Options | Nitrile, EPDM, Silicone | Nitrile, EPDM | Urethane | Nitrile, EPDM, FVMQ |
| Function | Open or Close on Vacuum Rise or Fall | Open or Close on Vacuum Rise or Fall | Open or Close on Vacuum Rise or Fall | Open or Close on Vacuum Rise or Fall |
| Pressure Range | .25″WC – 300″WC | (-2.5″WC) – 298″WC | 1.50 inches of water to 120 PSI | 3 psi to 130 [so |
| Max. Proof Pressure | Max Varies | Max Varies | 407″WC | 145 psi |
| Contact Configuration | SPDT, DPDT, SPST | SPST, SPDT, DPST, or DPDT | SPST, DPDT | SPST OR SPDT |
| +100,000 Max. Resistive Cycle Rating @120VAC | 25 Amps | 25 Amps | 15 Amps | 16A |
| Certifications | UL, cUL, RoHS & REACH | UL, cUL RoHS & REACH Compliant | UL(508 Specific models only), RoHS & REACH | UL, cUL |
| Country of Origin | USA | USA | UK | China |
Switch Parts
**Tip: Search this list for your part number using the Find function of your browser – Google Chrome’s shortcut is ctrl-f.
Can’t find your part number listed? Give our direct support a call with your switch or application requirements and one of our customer service representatives will assist you!
| Your Part Number | Our Part Number | Item Description | Buy Now |
|---|---|---|---|
| 6731 Series & 6732 Series | Adjustable Pressure Switches | Adjustable low pressure switches
Range: 1.5 inches of water to 16 psig Switch Rating: 21A@250VAC |
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| 6741 Series & 6742 Series | Adjustable Pressure Switches | Adjustable medium pressure switches
Range: 1.5 Psi to 125 Psi Switch Rating: 21A@250VAC |
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| 3000 Series | Adjustable Pressure Switches | Adjustable pressure switches
Range: 2 inches of water to 100 psi Switch Rating: 21A@250VAC |
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| 3900 Series | Adjustable Pressure Switches | Adjustable pressure switches
Range: 6 inches of water to 5 psi Switch Rating: 21A@250VAC |
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| 4000 Series | Adjustable Pressure Switches | Adjustable pressure switches
Range: 6 inches of water to 5 psi Switch Rating: 21A@250VAC |
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| V4000 Series | Adjustable Vacuum Switches | Adjustable vacuum switches
Range: 2 inches of water to 300 inches of water. Switch Rating: 21A@250VAC |
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| PSW21A | PM10103E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 3-7 inches of water rising Switch Rating: 3A@250VAC (resistive) |
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| PSW21B | PM10306A | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 5-35 inches of water rising Switch Rating: 5A@250VAC (resistive) |
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| PSW21C | PM11120E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 1-6 Psig Rising Switch Rating: 21A@250VAC (resistive) |
$44.95 |
| PSW21D | PM12540E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 4-11 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21E | PM12550E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 9-18 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21F | PM12560E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 15-28 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21G | PM12570E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 25-40 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21H | PM12580E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 35-65 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21J | PM12590E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 50-100 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21K | PM12595E | Pressure Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 75-120 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21L | VM10103E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 5-7 inches of water rising Switch Rating: 3A@250VAC (resistive) |
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| PSW21M | VM10306E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 6-16 inches of water rising Switch Rating: 5A@250VAC (resistive) |
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| PSW21N | VM10510E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 13-25 inches of water rising Switch Rating: 10A@250VAC (resistive) |
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| PSW21P | VM11115E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 20-40 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$44.95 |
| PSW21Q | VM11120E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 35-80 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$44.95 |
| PSW21R | VM11130E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 75-150 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$44.95 |
| PSW21T | VM11140E | Vacuum Switch with SPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 145-300 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$44.95 |
| PSW21BD | PM21306E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 5-35 inches of water rising Switch Rating: 5A@250VAC (resistive) |
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| PSW21CD | PM21120E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 1-6 Psig Rising Switch Rating: 21A@250VAC (resistive) |
$49.95 |
| PSW21DD | PM22540E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 4-11 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21ED | PM22550E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 9-18 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21FD | PM22560E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 15-28 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21GD | PM22570E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 25-40 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21HD | PM22580E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 35-65 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21JD | PM22590E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 50-100 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21KD | PM22595E | Pressure Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 75-120 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW21MD | VM21306E | Vacuum Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 6-16 inches of water rising Switch Rating: 5A@250VAC (resistive) |
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| PSW21ND | VM20510E | Vacuum Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 13-25 inches of water rising Switch Rating: 10A@250VAC (resistive) |
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| PSW21PD | VM21115E | Vacuum Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 20-40 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$49.95 |
| PSW21QD | VM21120E | Vacuum Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 35-80 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$49.95 |
| PSW21RD | VM21130E | Vacuum Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 75-150 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$49.95 |
| PSW21TD | VM21140E | Vacuum Switch with DPDT Switch, 1/8 MNPT Fitting and 9/16 Threaded Mounting Nut
Range: 145-300 inches of water rising Switch Rating: 21A@250VAC (resistive) |
$49.95 |
| PSW22A | PT10103A | Pressure Switch with SPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 3-7 inches of water rising Switch Rating: 3A@250VAC (resistive) |
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| PSW22B | PT10306A | Pressure Switch with SPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 5-35 inches of water rising Switch Rating: 5A@250VAC (resistive) |
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| PSW22C | PT11120A | Pressure Switch with SPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 1-6 Psig Rising Switch Rating: 21A@250VAC (resistive) |
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| PSW22D | PT12540A | Pressure Switch with SPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 4-11 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW22E | PT12550A | Pressure Switch with SPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 9-18 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW22F | PT12560A | Pressure Switch with SPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 15-28 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW22BD | PT21306A | Pressure Switch with DPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 5-35 inches of water rising Switch Rating: 5A@250VAC (resistive) |
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| PSW22CD | PT21120A | Pressure Switch with DPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 1-6 Psig Rising Switch Rating: 21A@250VAC (resistive) |
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| PSW22DD | PT22540A | Pressure Switch with DPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 4-11 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW22ED | PT22550A | Pressure Switch with DPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 9-18 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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| PSW22FD | PT22560A | Pressure Switch with DPDT Switch, Center Spout Fitting and 9/16 Threaded Mounting Nut
Range: 15-28 Psig Rising Switch Rating: 25A@250VAC (resistive) |
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