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Interlock Switch

Our Range Of Products

Interlock Switch

Interlock Switches

SI Series safety limit switches combine switch and actuator in one device that mounts directly to a machine. The switch is actuated by the presence or movement of a mechanical machine guard and triggers an output when the guard reaches a user-defined switching point.

  • Four actuator types are available—lever, spindle-mount lever, plunger, and roller
  • Mechanically coded actuators use two independent operating elements to minimize intentional tampering or defeat
  • Rotating head and top or side engagement allows for eight different actuator positions
  • One-piece switch eliminates need for alignment, engagement and risk of breakage of a separate actuator
  • Design meets positive opening requirements for safety interlocks
  • IEC IP65 rated housing
Magnet Switches


  • Random or teachable code
  • Safe switch on distance Sao : 8 mm
  • Safe switch off distance Sar : 18 mm
  • PVC cable or M12 pigtail connection
  • Type 4, high coding level according to ISO 14119
  • Category 4, PL e according to ISO 13849-1
  • Extremely compact size
  • ECOLAB certified
Reed Switches
  • Durability. Hall Effect sensors may need additional packaging to protect them from the environment, whereas reed sensors are protected within hermetically sealed containers. However, since reed sensors use mechanical movement, they are more susceptible to wear and tear.
  • Electricity demand. Hall Effect switches require a constant flow of current. Reed sensors, on the other hand, only require power to generate a magnetic field intermittently.
  • Vulnerability to interference. Reed switches can be prone to mechanical shock in certain environments, while Hall Effect switches are not. Hall Effect switches, on the other hand, are more susceptible to electromagnetic interference (EMI).
  • Frequency range. Hall effect sensors are useable over a wider frequency range, while reed sensors are usually limited to applications with frequencies below 10 kHz.
  • Cost. Both sensor types are fairly cost-effective, but overall reed sensors are cheaper to produce, which makes Hall Effect sensors somewhat more expensive.
  • Thermal conditions. Reed sensors perform better in extreme hot or cold temperatures, while Hall Effect sensors tend to experience performance issues at temperature extremes.
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