At Presair, we are pleased to provide you with a technical adjustable vacuum switch cross-reference guide. This guide assists you in comparing our products with those of notable competitors like Tecmark, Herga, and Lefoo.
Features of Presair Adjustable Vacuum Switches
Presair adjustable vacuum switches offer straightforward electrical on/off control over pressures. As vacuum increases, one contact opens while the other closes, providing an ideal solution for monitoring, controlling, and notifying. These switches are field adjustable but can also be preset at the factory if preferred. Additionally, dual switches are available, factory set to operate two separate microswitches at different vacuum settings. With multiple body styles, these switches offer the necessary versatility for various air hose connections.
For more details, view the product page. To purchase, click here.
Competitor Comparison
This guide includes the following models:
Tecmark: V4000 series
Herga: HPS-600-V series
Lefoo: LFS-01 series
Whether you are an experienced technical professional or exploring alternatives, our cross-reference guide helps you find the right match for your needs.
Adjustable Vacuum Switch Cross-Reference
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 |
| 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) |
Contact Us |
| 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) |
Contact Us |
| 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) |
Contact Us |
| 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 |
| 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) |
Contact Us |
| 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) |
Contact Us |
| 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 |
