Connecting limit switches (pop-top roof, bed)

Updated 9 October 2026Switchy

Switchy has 2 inputs for limit switches. With them, the motor of a lift bed, pop-top roof or slide-out stops by itself as soon as it has reached the very top or the very bottom, that is its end position.

Which switches are suitable

Usually magnetic switches are used for this, known as reed contacts. But any simple contact works that only opens and closes and does not bring its own voltage. Specialists call this volt-free (potential-free). Only a weak control signal flows through the contact, not the motor current. That is why any standard contact for low voltage is enough.

There are two types:

  • Normally open (NO): the contact is normally open and closes when the end position is reached.
  • Normally closed (NC): the contact is normally closed and opens when the end position is reached.

How to connect it

  1. Wire it: run the two wires of the contact to one of the two end position inputs on Switchy.
  2. Set the type: in the dashboard, set for each input whether you are using a normally open (NO) or a normally closed (NC) contact.
  3. Link it to the motor: use a widget in the dashboard to connect the input to the 12V or 24V channel the motor is connected to. When the mechanism reaches the end position, Switchy automatically switches off the power for this channel.
  4. Test: trigger the end position once by hand and check that the motor really stops.

Related questions

What can I switch with Switchy?

Up to eight devices from one place: • 4 channels for 12V and 24V, each up to 30A, for example a pump, a fan or a lift bed • 4 channels for 230V, each up to 10A or 2300W, for example a boiler or sockets Appliances that draw much more, such as an air conditioner, a tumble dryer or an induction hob, do not belong behind Switchy. They get their own circuit breaker in the 230V distribution. More on this in [Switching loads with Switchy](/blogs/wissen/verbraucher-ueber-switchy-schalten).

Can I connect wall push buttons to Switchy?

No, Switchy has no push button inputs. You switch its channels on the SmartKnob or in the dashboard, also on a schedule or as part of a scene. If you also want to switch a device at the wall, connect it to Ampy or Lighty instead. There you can connect a push button to every output.

Does Switchy show what my devices consume?

No. Switchy switches, it does not measure. Ampy measures what each individual device draws, output by output. Battery and system data come from Volty. All three work together in the same dashboard.

Which fuses do I need for Switchy?

Switchy has no fuses of its own for the connected devices; they belong in the installation: • 12V and 24V: each channel gets its own fuse in the positive cable, no more than 30cm from the battery's positive terminal. • 230V: a 30mA residual current device and a B10 circuit breaker sit in front of Switchy. Only a qualified electrician may carry out the 230V installation. Why it has to be a B10 is explained in [Why a B10 circuit breaker is needed at 230V](/blogs/wissen/warum-lss-b10).

What happens if the shore power pillar is wired incorrectly?

Switchy checks the shore power continuously and shows you on the SmartKnob and in the dashboard whether everything is in order. • If the earth is missing, Switchy switches off all four 230V channels within milliseconds and the SmartKnob raises an alarm. Once the earth is back, you switch your devices back on yourself. That way nothing starts up unattended. • If live and neutral are swapped, it is almost always down to a Schuko plug or adapter. Pull the plug, turn it by 180 degrees and plug it back in. All the details in [What the AC input monitoring does](/blogs/wissen/was-die-ac-eingangsueberwachung-macht).

Can Switchy react automatically when I plug into shore power?

Yes. Switchy detects whether shore power is present, and you can use that as a trigger in the dashboard. For example, the boiler switches on as soon as you plug in at the campsite and off again when you unplug.

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