Protection and safety of Ampy

Updated 12 October 2026Ampy

Ampy protects itself and your system out of the box, with several layers of protection, not just one:

  • Electronic fuse for each output: value and tripping behaviour freely adjustable
  • Short-circuit protection in hardware: acts in fractions of a second, without any software
  • Overvoltage and undervoltage protection for each load: can be switched on and adjusted
  • Temperature monitoring: if it gets too warm inside the device, Ampy switches off in stages.
  • Safe state after a fault, with restore after a power cut: after a fault, the affected output stays off. If only Ampy loses power, it restores the last state of its outputs by itself once power is back, and your settings are kept. A boiler heating element that Ampy has already locked stays off until you deliberately reset the fuse.
  • Direction interlock for motors: never both directions at the same time

A second, independent monitoring

It keeps watch over the main control: if the control fails, the second monitoring brings all outputs into the safe state in a controlled way, like a co-pilot looking over the pilot's shoulder.

Developed to automotive standards

Ampy is developed to ISO 26262 up to ASIL B, the functional safety standard that airbags, ABS and electronic steering in cars are also built to. Put simply: it is not enough for a device to work under normal conditions, it must also be planned and proven what happens in the event of a fault. ASIL B is the safety level achieved here, and the scale goes from A to D. The key semiconductors in the power and safety path are also automotive-qualified to AEC-Q100, which means they are designed for tough continuous use in vehicles.

Related questions

Does Ampy work on 12V and 24V?

Both. Ampy detects the vehicle's electrical system automatically, so there is nothing to change.

How is Ampy connected?

The supply goes onto two M6 threaded studs, the loads into lever terminals for up to 4mm²: open, insert, close, no tools needed. The push button wires go into removable spring terminals.

How much current can an Ampy output draw?

24A continuously, up to 32A for short periods, and 120A across all six outputs combined. So even a compressor fridge, an inverter and a parking heater fit on a single output.

Do I still need to buy fuses for Ampy?

Not for the loads connected to Ampy. Every output has an electronic fuse that you adjust instead of replacing.

What happens when a fuse on Ampy trips?

The output switches off and you see it in the dashboard, including the reason. Resetting takes a single tap. If the fuse trips several times in a row, Ampy enforces a short pause so that a genuine fault is not simply glossed over.

Fast, normal or slow: which tripping characteristic should I choose?

The characteristic determines how quickly the fuse cuts out when the current is too high. As a rule of thumb: slow for anything that briefly draws more when it switches on, fast for pure electronics, normal for everything in between. • Choose slow for motors and compressors: water pump, fridge, fan, awning, pop-top roof, inverter. These loads draw several times their continuous current at the moment they switch on, which is completely normal. A fast fuse would trip every time, even though nothing is wrong. • Choose fast for loads without inrush current, such as LED strips, sensors, control units or charging sockets. Here a sudden rise in current is almost always a fault, and then it should cut out quickly. • Normal is the safe choice if you are unsure. A practical tip: if the fuse only trips at switch-on while the continuous current is fine, set it one step slower. Raising the fuse rating instead would be the wrong approach, because the rating still has to match the cable cross-section.

See all questions

Still have questions? We'll help you personally.

Get in touch