# Pressure Switch, Gauge, 1/8"-27 MNPT, 0.8 psi, 30 psi, SPST
**URL**: https://novapart.co/products/PSW-621/pressure-switch-gauge-1-8-27-mnpt-08-psi-30-spst
**SKU**: PSW-621
**Manufacturer**: OMEGA
**Category**: Sensors & Transducers || Sensors || Pressure Sensors, Transducers || Pressure Switches
**Price**: €182.0400
**Stock**: 10+
**Lead Time**: 36 days (indicative)
## Specifications
| Parameter | Value |
|---|---|
| Svhc | No SVHC (04-Feb-2026) |
| Deadband Max | 1.3psi |
| Deadband Min | 0.8psi |
| Pressure Type | Gauge |
| Product Range | PSW-620 Series |
| Sensor Mounting | Stud |
| Pressure Port Size | 1/8"-27 |
| Pressure Port Type | 1/8"-27 MNPT |
| Contact Configuration | SPST |
| Electrical Connection | Pigtail Leads |
| Switching Current Max | 3A |
| Switching Voltage Max | - |
| Operating Pressure Max | 30psi |
| Operating Pressure Min | 0.8psi |
| Pressure Fitting Style | 1/8"-27 MNPT |
| Operating Temperature Max | - |
| Operating Temperature Min | - |
| Transducer Connection / Termination | Pigtail Leads |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:3867891/)
## _**Economical prEssurE and Vacuum switchEs**_
## _**Vacuum to 500 psi**_
## _**psw-620/psw-630 series**_
- U **External Pressure Scale and Pointer for Easy Setpoint Adjustment**
- U **Silver Switch Contacts Rated for 5 A @ 250 Vac or 3 A @ 28 Vdc**
- U **1 A Gold-Plated Contacts for TTL or Dry Contacts**
**==> picture [319 x 184] intentionally omitted <==**
**----- Start of picture text -----**
Knurled
locking
—— —r t ring. — _'- By
Sliding
Gage
pointer.
PSW-631 PSW-633
Field
adjustable
**----- End of picture text -----**
**==> picture [122 x 7] intentionally omitted <==**
**----- Start of picture text -----**
Both models shown actual size.
**----- End of picture text -----**
## **SPECifiCATionS**
**Process Temp:** -55 to 105°C (-65 to 221°F); 2% setpoint shift can occur below -23°C (-10°F) or above 52°C (125°F)
**Repeatability:** ±2% of maximum system pressure
**Cycling:** Not to exceed 20 cycles/ minimum
**Warranty:** 3 year/1 million cycles **Proof Pressure:** 150% maximum pressure
**Wetted Parts:** 17-7 PH stainless steel, loctite sealing compound #271, ZA8 chromate finish
**Enclosure:** Zinc alloy, chromate finish **Dimensions:** 48 L x 28 mm Dia. (1.9 x 1.1")
**Pressure Port:**[1] /[8] -27 MNPT
**Electrical Connection:** 300 mm (12") pigtail leads, 20 AWG, polyvinyl insulated
**Wiring Code (Pressure):**
Red = N/C
White = N/O
Black = Common **Wiring Code (Vacuum):** Red = N/O
White = N/C Black = Common **Weight:** Approx. 57 g (2 oz)
## **To Order**
|**To Order**|**To Order**|**To Order**|**To Order**|**To Order**|**To Order**|
|---|---|---|---|---|---|
|**MoDEL no.**|**ADjuSTABLE RAnGE**
**DECREASinG inCREASinG***||**DEADBAnD**|**MAx**
**PRES***|**SWiTCH**|
|**Gage Pressure Switches(units =psi)**
~~a~~
~~es~~||||||
|**PSW-621**
~~a~~
~~a~~|0.8 to 28.5
~~es~~|1.6 to 30
~~ee~~|0.8 to 1.3|30|1 A|
|**PSW-622**
~~a~~
~~es~~
~~a~~
~~es~~|2.0 to 38.3
~~es~~
~~es~~
~~es~~|3.0 to 40
~~es~~
~~ee~~
~~ee~~|1.0 to 1.7
~~es~~
~~ee~~|50
~~es~~
~~ee~~|1 A
~~es~~
~~ee~~|
|**PSW-623**
~~a~~
~~es~~|3.0 to 96.5
~~es~~|4.5 to 100
~~ee~~
~~ee~~|1.5 to 3.5
~~ee~~|100
~~ee~~|1 A
~~ee~~|
|**PSW-624**
~~es~~|7.5 to 242.5
~~es~~|9.7 to 250
~~ee~~|2.2 to 9.0
~~ee~~|250
~~ee~~|1 A
~~ee~~|
|**PSW-625**
~~es~~
~~a~~
~~es~~|15 to 485
~~es~~|20 to 500
~~ee~~|5.0 to 21
~~ee~~|500
~~ee~~|1 A
~~ee~~|
|**PSW-631**
~~es~~
~~es~~|0.8 to 28.5|1.6 to 30|0.8 to 1.3|30|5 A|
|**PSW-632**
~~es~~
~~es~~
~~ee~~|2.0 to 38.3
~~es ee~~|3.0 to 40
~~ee~~|1.0 to 1.7|50|5 A|
|**PSW-633**
~~es~~
~~ee~~
~~a~~|3.0 to 96.5
~~es ee~~|4.5 to 100
~~ee~~
~~ee~~|1.5 to 3.5|100|5 A|
|**PSW-634**
~~ee~~
~~es~~
~~a~~|7.5 to 242.5
~~es ee~~
~~es~~
~~a~~|9.7 to 250
~~ee~~
~~es~~
~~ee~~
~~ee~~|2.2 to 9.0
~~es~~
~~ee~~|250
~~es~~
~~ee~~|5 A
~~es~~
~~ee~~|
|**PSW-635**
~~a~~|15 to 485
~~a~~|20 to 500
~~ee~~
~~ee~~|5.0 to 21
~~ee~~|500
~~ee~~|5 A
~~ee~~|
|**Vacuum Switches(units = inHg Vacuum)**
~~a~~
~~ee ee~~
~~ee~~
~~ee~~||||||
|**PSW-626**
~~ee~~
~~ee~~|1.6 to 27.0
~~ee~~
~~es~~|2.7 to 28.2
~~ee~~
~~ee~~|1.3 to 2.7
~~ee~~|~~ee~~
~~|~~|1 A
~~ee~~
~~|~~|
|**PSW-627**
~~ee~~
~~ee~~
~~ee~~|4.0 to 24.8
~~ee~~
~~es~~
~~ee ee~~|5.1 to 28.2
~~ee~~
~~ee~~
~~ee~~|1.5 to 3.2
~~ee~~||1 A
~~ee~~
~~|~~
~~||~~|
|**PSW-628**
~~ee~~
~~ee~~
~~ee~~|6.0 to 21.5
~~es~~
~~ee ee~~
~~ee~~|8.4 to 28.2
~~ee~~
~~ee~~
~~ee~~|2.0 to 7.3|28.2 inHg
vacuum or
0 psig*****
~~|~~
~~|~~|1 A
~~|~~
~~||~~
~~|~~|
|**PSW-636**
~~ee~~
~~ee~~
~~ee~~|1.6 to 27.0
~~ee ee~~
~~ee~~
~~es~~|2.7 to 28.2
~~ee~~
~~ee~~|1.3 to 2.7||5 A
~~||~~
~~|~~
~~|~~|
|**PSW-637**
~~ee ~~
~~ee~~
~~ee~~|4.0 to 24.8
~~ee~~
~~es~~|5.1 to 28.2
~~ee~~|1.5 to 3.2||5 A
~~|~~
~~|~~
~~|~~|
|**PSW-638**
~~ee~~
~~ee~~|6.0 to 21.5
~~es~~|8.4 to 28.2|2.0 to 7.3||5 A
~~|~~
~~||~~|
_*****[ Exceeding these values may cause a shift in the setpoint. ] Comes complete with operator’s manual._
_**Ordering Example: PSW-635,** switch for maximum system pressure of 500 psig with 5 A switch contact._
**H-13**
## Links
- [View this product on Novapart](https://novapart.co/products/PSW-621/pressure-switch-gauge-1-8-27-mnpt-08-psi-30-spst)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/omega/psw-621/pressure-switch-30psi-1port-1/dp/3867891)
---
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