Seat Belt Buckle Sensing Series - Mechanical

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The sensor detects whether the seat belt buckle is latched or unlatched, allowing the passenger safety system to determine the optimum airbag deployment. It is also used as an input to the electronic park brake and the unbuckled warning system.



  •  Vehicle occupant safety systems
automotive-sensor-customLittelfuse vehicle sensors are designed for customer-specific applications and packaging. To learn more, contact Littelfuse.

  • Robust construction makes this sensor well suited to harsh environments

  • No standby power required

  • No magnet on thorn required

  • Gold plated contacts give excellent life and reliability

  • Mechanically operated position sensor

  • Simple, cost effective mechanism

  • Integrated in seat belt buckle

  • Normally open contact

  • Operates when the thorn in the seat belt buckle moves from an unlatched to a latched position

  • Choice of cable length and clips

  • Choice of connector and terminals

  • Choice of circuitry for output voltages

Access specifications, certifications, check availability and order parts below

Catalog #Operating Voltage (V)Operating Current (mA)Contact TypeOperating Temperature (°C)Endurance Life Cycles (#)
Mechanical1230Normally Open-40 to +85150,000