LEFOO LF10-W Water Pump Pressure Switch
Pump control / low-pressure protection in the LEFOO LF10-W family. The correct operating range, contact wiring and hydraulic or pneumatic installation depend on the ordered variant.
Model Identification & Key Specifications
Manufacturer Technical Data
OEM distinguishes LF10-WS (normally closed pump operation) and LF10-WR (normally open low-pressure protection / dry-run recovery). The site gives LF10-WR factory low/high figures with reversed-looking ordering in some entries, so verify actual cut-in/cut-out with the original producer instead of copying into controller settings. The automatic recovery version may restart the pump after supply pressure returns, which needs system-level safeguards.
AirAlign Engineering & Selection Analysis
WS pump-control and WR low-pressure safeguarding perform different roles, so matching thread and appearance is insufficient for substitution. Automatic reset can restart a pump unexpectedly when source pressure returns; check dry-run strategy and human-safety conditions.
Correct system operation is determined by the restart threshold, stop threshold, motor electrical duty and the available pressure supply. An adjustment range does not imply every combination is approved: compare manufacturer-specified differential, pressure proof, operating medium and fitting. For motor-driven equipment, locked-rotor conditions, overload protection and cycling frequency are separately important even where a contact-current rating is published.
Installation, Compatibility & Protection
Specify both cut-in and cut-out conditions for the intended equipment, and verify the manufacturer’s permitted hysteresis. Do not use proof or burst pressures as running thresholds.
NO and NC contacts have different protection and restart behavior. Match the wiring schedule and motor/contactor duty, rather than relying only on voltage and ampere numbers.
Verify actual air versus water compatibility, wetted materials, connection thread standard, sealing method and temperature of the process. The manufacturer variant must support the full application.
A maker-hosted CE, TÜV, UL or CSA record may cover only stated models and revisions. It is not equivalent to proof of ATEX/IECEx approval or a finished installation certificate.
LF10-WS vs LF10-WR: Different Control Logic
LF10-W is not a single normally-closed water pump switch. Its WS and WR configurations have opposite contact logic, so the installed system must be identified before a replacement or relay rewiring.
| Family option | Contact behavior | System function and check |
|---|---|---|
| LF10-WS | Normally closed (NC) | Pressure-dependent water-pump regulation; verify cut-in/cut-out pair and switch wiring. |
| LF10-WR | Normally open (NO) | Low-pressure protection and return-to-pressure behavior in matching control designs; confirm how a pump is restarted. |
| LF10A-WS / LF10A-WR | Same respective switching families with a separate electrical-rating option | Do not infer the higher current option from a similar housing or base model. |
The manufacturer lists WS adjustment options spanning approximately 2.0–7.0 and 2.5–10.5 kgf/cm², but the individual setting pairs and WR actuation differ. Treat the maker table as a menu of variants—not a universal adjustable envelope on one delivered switch.
Maker evidence: LEFOO LF10-W WS/WR contact and pressure tables.
Related Models & AirAlign Categories
LEFOO LF16 Water Pump Switch · LEFOO LF17-W Water Pump Switch · Pressure Switches · LEFOO manufacturer profile
Official Manufacturer Sources
Original maker catalogue evidence used for the model values above. Review the latest datasheet, ordering chart and approval scope for the specific suffix.
LF10-W — water service versus compressor LF10
LF10-W is identified for water-pump control and low-pressure protection, distinguishing it from LF10 compressor service. Confirm whether the selected unit contains a genuine low-water/low-pressure permissive function or only basic pressure switching. Pump cycling depends on expansion/pressure tank and switch differential. Verify wetted seals, contact rating and complete order suffix; an air compressor’s unloader device or port dimensions should not be automatically copied to a water system.