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The hydraulic pump is often fitted where, in flight, it is impossible to
reach the 50 amp circuit breaker fitted next to the pump.  If the pump needs
to be shut down for any reason how does one do it without shutting down the
whole electrical system via the master switch.

In my case I have deleted the header tank and the pump occupies space on the
right hand firewall above the feet of the passenger.  I looked at locating
the circuit breaker on the panel but do not want a noisy wire to and from
the pump running in that area.  My next idea is to have a normally closed 50
amp relay between the pump and its supply and only to energize it in the
event the pump needs to be shut down.  Bosch makes just that sort of relay.

Any other ideas anyone?  I believe it is essential to have a means of
shutting down such a heavy power user in case its operating contactors
failed in the  closed position or a pressure switch failed and commanded the
motor to run or a leak developed.  One could go on and on!

Regards

Ian Crowe

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