Scrooge McDuck's Money Bin seems to be more closely guarded by more security systems than Fort Knox which holds the U.S.A.s gold reserves. This means that the Bin with its multiple security devices stands as a very potent adversary to potential intruders. Still, the Bin has its flaws which both Magica de Spell and the Beagle Boys have found on several occasions. They have also found their way to the money - be it only for a brief moment.
Now, let's have a look at some of the security systems that we know from Carl Barks' stories. Undoubtedly, Scrooge has even more secret devices up his sleeve...

Peddler-Eliminator	Boer War Cannon	Fire Extinguisher
Periscope	Top Security Entrance Hall	Patrolling Police Officer
Moth Swatters	Power Surveillance Panel	Heat Suits
Indestructible Glass Coating	Guardsmen	Burglar Alarms and Electric Eyes
Armoury	Bank of Lightning Rods	Grating and Steel Doors
Safe Combination	Magnetic Depolarizer	Codeword Operated Microphone, Drawbridge
Impervium Metal Box with 7 Locks	Cyclone Spin Diffuser	Rat Trap
Metal Screens	Watchman(!)	Mine Field
Sulphuric Acid	Mouse Chasing Cat	Spider Sprayer
Open Sesame Flute	Bird Catching Net	Impervi-Wax Coating
Booby Trap	Moth Annihilator	Burglar Batterer