Diaphragm pressure switch LF727B

SPDTM12 connectorbare wires

Product overview
The LF727B is a diaphragm (plunger/diaphragm) pressure switch designed for industrial and automotive pressure detection and control. When system pressure reaches a setpoint the device issues an electrical signal (SPDT) to actuate mechanical equipment or trigger alarms. Max working pressure 450 bar; burst pressure 600 bar.

Key features

• Switch type: SPDT
• Typical applications: industrial and automotive pressure control
• Max working pressure: 450 bar
• Burst pressure: 600 bar
• Repeatability/accuracy and endurance designed for repeated switching in normal pollution environments

Parameters
Body material: Zinc plated steel / Stainless steel / Brass
Contact: Silver cadmium alloy
Max voltage: 250 VAC / 42 VDC
Max current: 4 A
Working temperature range: -40 °C to +100 °C (depends on diaphragm choice)
Mechanical life endurance: 1×10^5 cycles
Electrical life endurance: 1×10^4 cycles
Pollution degree: Normal
Repeatability: ±2%
IP grade: wire leads IP00; with Hirschmann connector IP65; resin‑sealed wires IP67
Applicable standard: EN 60730-1
Weight: approx. 140 g

Dimensions
Dimensional drawings are available in the technical documentation (see product datasheet).

Applications

• Industrial pressure control and protection
• Automotive pressure sensing and safety systems
• Systems requiring pressure‑triggered electrical signalling (alarms, leak detection, actuator control)

Technical specifications

• Model: LF727B (diaphragm pressure switch)
• Contact configuration: SPDT
• Body material options: zinc plated steel, stainless steel, brass
• Contact material: silver‑cadmium alloy
• Electrical rating: up to 250 VAC / 42 VDC, max 4 A
• Operating temperature: -40 °C to +100 °C (diaphragm dependent)
• Mechanical life: ~1×10^5 cycles
• Electrical life: ~1×10^4 cycles
• Repeatability: ±2%
• Protection variants: IP00 (wire leads), IP65 (Hirschmann), IP67 (resin‑sealed)
• Standards: EN 60730-1
• Max working pressure: 450 bar; burst pressure: 600 bar
• Approx. weight: 140 g