The switch turns off the main circuit.

Trigger

• Manually
• Attaching additional leash or maybe leash of the board to the outside part of the switch

Cut-off element

• High current relay
• VESC ADC input - it is a feature of VESC to cut-off the power when the voltage on the ADC input is below some threshold

Switch Sensor

Switch sensor together with magnets is attached to the box inside. Magnets on the outside used to hold the outside part on the box. Additionally on outside magnet or metal used to trigger the sensor.

• Proximity sensor - Metal as the trigger.
  https://a.aliexpress.com/_msVyfoq (opens in a new tab)
  https://foil.zone/t/relay-electromagnetic-switch/19359/6 (opens in a new tab)
• Hall sensor - Magnet as the trigger.
• Reed switch - Magnet as the trigger.

https://foil.zone/t/relay-electromagnetic-switch/19359/7 (opens in a new tab)