A vibration isolation device comprising: - a frame intended to be mounted on an engine casing, - a structure intended to be mounted to an external component to isolate, - a resilient member located between said frame and said structure, - at least one fuse mechanism ensuring that said vibration isolation device presents a first stiffness when loads applied to said vibration isolation device are below a predetermined threshold load, and a second stiffness, lower than the first stiffness, when loads applied to the vibration isolation device are at least equal to said predetermined threshold load, wherein said fuse mechanism is arranged, within said vibration isolation device, to constrain said resilient member within a predetermined space when the loads applied to the vibration isolation device are below said predetermined threshold load and to release said resilient member so that this latter is capable of deforming beyond said predetermined space when loads applied to the vibration isolation device are at least equal to said predetermined threshold load, characterized in that said resilient member is partially bonded: to said frame, and/or where said resilient member is comprised of a stack at least containing a first layer of a resilient material, a second layer of resilient material and a plate both arranged between and more rigid than said first layer of resilient material and said second layer of resilient material: to said plate so as to define a bonding force between said resilient member and said frame and/or said plate, said bonding force defining said fuse mechanism and corresponding to said predetermined threshold load. - a frame intended to be mounted on an engine casing, - a structure intended to be mounted to an external component to isolate, - a resilient member located between said frame and said structure, - at least one fuse mechanism ensuring that said vibration isolation device presents a first stiffness when loads applied to said vibration isolation device are below a predetermined threshold load, and a second stiffness, lower than the first stiffness, when loads applied to the vibration isolation device are at least equal to said predetermined threshold load, wherein said fuse mechanism is arranged, within said vibration isolation device, to constrain said resilient member within a predetermined space when the loads applied to the vibration isolation device are below said predetermined threshold load and to release said resilient member so that this latter is capable of deforming beyond said predetermined space when loads applied to the vibration isolation device are at least equal to said predetermined threshold load, characterized in that said resilient member is partially bonded: to said frame, and/or where said resilient member is comprised of a stack at least containing a first layer of a resilient material, a second layer of resilient material and a plate both arranged between and more rigid than said first layer of resilient material and said second layer of resilient material: to said plate so as to define a bonding force between said resilient member and said frame and/or said plate, said bonding force defining said fuse mechanism and corresponding to said predetermined threshold load.