Mechanical pressure switch LF17

differentialNCNPT 1/4

Product Overview
The LF17 pressure switch is engineered for heavy-duty commercial air compressors, offering selectable pressure ranges to suit large industrial systems. Its painted steel case and cover provide durable protection for demanding environments. An unloader valve option is available to prevent starts under load.

Parameters (table)
Model | Media | Operating Pressure Range | Factory Setting | Differential | Electrical Rating | Contact Arrangement | Connection
LF17 | Air | 40–250 psi | 140–175 psi | 35–60 psi | 120VAC, 24A; 240VAC, 20A | NC | 1/4, 3/8 NPT Male or Female
LF17 | Air | 15–60 psi | 30–45 psi | 15–20 psi | 120VAC, 24A; 240VAC, 20A | NC | 1/4, 3/8 NPT Male or Female
LF17A | Air | 240–500 psi | 325–400 psi | 55–70 psi | 120VAC, 30A; 240VAC, 25A | NC | 1/4, 3/8 NPT Male or Female

Documents & Certifications (available)
Specification PDF (product sheet) and certification files available for LF17: UL certificate, CSA certificate and CCC certificate.

Features / Technical specifications

• Model: LF17 (also available as LF17A high-pressure variant)
• Application: Heavy-duty commercial air compressors (LF17 up to 250 psi; LF17A higher ranges)
• Media: Air
• Operating pressure ranges: LF17 — 15–60 psi and 40–250 psi (two selectable ranges); LF17A — 240–500 psi
• Factory settings: LF17 — 30–45 psi (low) and 140–175 psi (high); LF17A — 325–400 psi
• Differential: LF17 — 15–20 psi (low) and 35–60 psi (high); LF17A — 55–70 psi
• Electrical rating: LF17 — 120VAC 24A / 240VAC 20A; LF17A — 120VAC 30A / 240VAC 25A
• Contact arrangement: NC (Normally Closed)
• Connection: 1/4 or 3/8 NPT, male or female
• Construction: Painted steel case and cover for industrial durability
• Option: Unloader valve to prevent starting under load
• Available documentation: Specification PDF and UL, CSA, CCC certificates