Lefoo · LF10
LF10 (LF10-1H, LF10-L1, LF10-4H)
Lefoo's LF10 is the switch inside most aftermarket boxes and a large share of new OEM compressors. It replicates the Furnas 69MB and Square D 9013FHG footprints, is UL Listed and CSA Certified, and is available in low, standard and high-pressure builds.
Specifications
- Action
- Standard — contacts open on rising pressure
- Adjustable range
- 25–100 psi, 35–150 psi and higher builds up to about 200 psi
- Differential
- 20–35 psi on the 25–100 build; 30–40 psi on the 35–150 build (fixed)
- Factory settings
- 55/80 psi (low build) · 85/115 psi · 95/125 psi (most common)
- Ports
- 1/4 or 3/8 in. male or female NPT single port; 1/4 in. female NPT four-port manifold version
- Unloader
- Available with unloader valve so the compressor never starts under load
- Lever / disconnect
- Auto/off disconnect lever available (the L in LF10-L1)
- Enclosure
- NEMA 1
- Temperature
- -22 °F to 257 °F
Electrical
- 20 A at 120 VAC, 12 A at 240 VAC on the standard build
- DPST, normally closed, snap action
- Roughly 2 HP at 120 V single-phase on the 15 A shop build — always confirm against the switch label
- Temperature range -22 °F to 257 °F
Size against motor full-load amps with the motor amperage calculator, and check feeder sizing with the voltage drop calculator.
Adjustment
- Range nut for both settings; the differential is fixed on standard builds.
- New-in-box Lefoos are often 5–10 psi off the stated factory setting. Verify on a gauge before you leave.
Before you open the cover
Kill power at the disconnect and lock out. Bleed the tank to 0 psi. Never set cut-out above the tank data-plate MAWP. Verify your numbers first in the cut-in / cut-out calculator.
Best fit
- Any 95/125 psi single-phase shop compressor
- Fast same-day replacement when the OEM switch is obsolete
Watch out
- Counterfeit and unlisted copies exist. Look for the UL/CSA marks moulded and printed, not a sticker.
- The 20 A rating is at 120 V — at 240 V it drops to 12 A. Size against motor FLA, not the headline number.
Cross-references
- Furnas 69MB7LY / 69JF7LY
- Square D 9013FHG12J52
- Condor MDR 11 (functional, metric ports)