The FFE 3171 series are rugged, weatherproof vibration switches designed to protect rotating and reciprocating machinery by detecting excessive vibration levels. They use a steel ball and magnetic mechanism that trips a microswitch when the set vibration threshold is exceeded. The switch remains latched until manually or remotely reset, depending on the variant.

Technical Details

Model Variants:
- 3171 MR: Manual reset via front pushbutton
- 3171 S: Remote or manual reset via internal solenoid coil
Adjustable Trip Range:
- 1 g to 9 g peak acceleration (factory set at 3 g standard)
- Trip level set externally via top-mounted screw
Contact Configuration:
- SPCO internal microswitch (single-pole)
- DP/DPST available in dual-pole (solenoid) version
Electrical Ratings:
- 5 A at 240 VAC non-inductive
- 3 A at 30 VDC non-inductive
- Solenoid coil: 48 W max, intermittent duty (25%)
Construction & Protection:
- Die-cast zinc alloy enclosure, IP66/67 rated
- Operating temperature: –35 °C to +85 °C (weatherproof), options for Ex versions
Mounting & Connection:
- Mount vertically using M5 screws (reset button at bottom)
- 20 mm cable gland entry, with screened or SWA cable recommended

FFE – 3171 MR/S – Adjustable Vibration Switch (1–9 g), Manual or Solenoid Reset

FFE – 3171 MR/S – Adjustable Vibration Switch (1–9 g), Manual or Solenoid Reset