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Roller ball contact

Velleman HAA29: Rollerball Contact Switch

Velleman HAA29

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The HAA29 is rollerball plunger style switch. The Velleman HAA29 has a normally open (NO) relay. This means when the rollerball is pushed into the housing, the switch closes, completing an electrical circuit.



  • Rollerball reed contact
  • Normally Open (NO) contact
  • Mounting hole: 0.8"
  • Operating gap: 0.14" max.
  • Contact resistance: 0.3 ohm
  • Switching current: 0.5A
  • DC switching voltage: 100V
  • AC switching voltage: 125V
  • Wire: 24 AWG / 90°C (194°F)
  • Dimensions: 1.59" x 0.85" x 1.81"
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 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product