Hi,

I have a case you guys maybe have some good input for.

I want to turn off and on a the power from a 25V battery to a load capable to draw about 60A (100A during short time) of current. The load will draw just a couple of amps during the on/off. The power switch control can be on both high and low side of the load. It shall be controlled by a jumper which turns on the load when the jumper is closed and off when it's open.
The whole circuit will be powered by a battery so when it's off (jumper closed) the off-current most be at the nA level.

So in short:
About 25V input
Control load capable of 60-100A (not during switching)
Jumper closed = load OFF
Jumper open = load ON
Load off current <1uA

Any ideas how to solve this in a simple and elegant way?

 

Welcome to AAC.

While your description is detailed it isn‘t clear to me. Without knowing exactly what problem this is intended to solve, there is a vacuum of context.

So, in anticipation of you explaining why you are doing this, I would say the trivial and obvious solution is a relay of sufficient rating and with an appropriate coil voltage. Just connect the power through the NO (normally open) contact.

This will draw 0mA when off and a small overhead current when on.

 

Welcome to AAC.

While your description is detailed it isn‘t clear to me. Without knowing exactly what problem this is intended to solve, there is a vacuum of context.

So, in anticipation of you explaining why you are doing this, I would say the trivial and obvious solution is a relay of sufficient rating and with an appropriate coil voltage. Just connect the power through the NO (normally open) contact.

This will draw 0mA when off and a small overhead current when on.

The whole circuit will be on a flying platform so it cannot carry a heavy relay/contactor with it. I think a better way would be to do a solid state solution for this. Have some ideas but they tend to draw to much leak current when off.

 

It is fairly common to use 1 or more MOSFETs at that kind of voltage and current. How is your application different that makes that arrangement unacceptable? Why the severe limit in leakage?

 

Why do you have the constraint of making having an absent jumper turn on the current?