A system for providing a gripping and sealing engagement with a casing string of a wellbore having an uphole direction, the system comprising: a downhole power unit having a power unit housing and a moveable shaft; and a through tubing bridge plug including an adaptor and an actuation rod having an exterior surface and a failure section positioned between first and second longitudinal sections (230, 232) of the actuation rod, the power unit housing operably associated with the bridge plug adaptor, the moveable shaft operably associated with the actuation rod; the bridge plug further including: an anchor assembly slidably disposed about the exterior surface of the actuation rod; a pair of compression assemblies slidably disposed about the exterior surface of the actuation rod, each compression assembly including a support assembly (216, 242) and an anti extrusion assembly (220, 238, 504); and a packing assembly slidably disposed about the exterior surface of the actuation rod between the compression assemblies; wherein, the actuation rod extends through the anchor assembly, the pair of compression assemblies and the packing assembly; wherein longitudinal movement of the moveable shaft causes longitudinal movement of the actuation rod in the uphole direction relative to the anchor assembly, the pair of compression assemblies and the packing assembly causing actuation of the anchor assembly to establish the gripping engagement with the casing string, radial deployment of the compression assemblies such that the anti extrusion assemblies (220, 238, 504) compress the packing assembly and actuation of the packing assembly to establish the sealing engagement with the casing string; and wherein, after establishing the gripping and sealing engagement with the casing string, continued longitudinal movement of the first longitudinal section of the actuation rod in the uphole direction causes the first longitudinal section of the actuation rod to separate from the second longitudinal section of the actuation rod at the failure section. a downhole power unit having a power unit housing and a moveable shaft; and a through tubing bridge plug including an adaptor and an actuation rod having an exterior surface and a failure section positioned between first and second longitudinal sections (230, 232) of the actuation rod, the power unit housing operably associated with the bridge plug adaptor, the moveable shaft operably associated with the actuation rod; the bridge plug further including: an anchor assembly slidably disposed about the exterior surface of the actuation rod; a pair of compression assemblies slidably disposed about the exterior surface of the actuation rod, each compression assembly including a support assembly (216, 242) and an anti extrusion assembly (220, 238, 504); and a packing assembly slidably disposed about the exterior surface of the actuation rod between the compression assemblies; wherein, the actuation rod extends through the anchor assembly, the pair of compression assemblies and the packing assembly; wherein longitudinal movement of the moveable shaft causes longitudinal movement of the actuation rod in the uphole direction relative to the anchor assembly, the pair of compression assemblies and the packing assembly causing actuation of the anchor assembly to establish the gripping engagement with the casing string, radial deployment of the compression assemblies such that the anti extrusion assemblies (220, 238, 504) compress the packing assembly and actuation of the packing assembly to establish the sealing engagement with the casing string; and wherein, after establishing the gripping and sealing engagement with the casing string, continued longitudinal movement of the first longitudinal section of the actuation rod in the uphole direction causes the first longitudinal section of the actuation rod to separate from the second longitudinal section of the actuation rod at the failure section. an anchor assembly slidably disposed about the exterior surface of the actuation rod; a pair of compression assemblies slidably disposed about the exterior surface of the actuation rod, each compression assembly including a support assembly (216, 242) and an anti extrusion assembly (220, 238, 504); and a packing assembly slidably disposed about the exterior surface of the actuation rod between the compression assemblies; wherein, the actuation rod extends through the anchor assembly, the pair of compression assemblies and the packing assembly; wherein longitudinal movement of the moveable shaft causes longitudinal movement of the actuation rod in the uphole direction relative to the anchor assembly, the pair of compression assemblies and the packing assembly causing actuation of the anchor assembly to establish the gripping engagement with the casing string, radial deployment of the compression assemblies such that the anti extrusion assemblies (220, 238, 504) compress the packing assembly and actuation of the packing assembly to establish the sealing engagement with the casing string; and wherein, after establishing the gripping and sealing engagement with the casing string, continued longitudinal movement of the first longitudinal section of the actuation rod in the uphole direction causes the first longitudinal section of the actuation rod to separate from the second longitudinal section of the actuation rod at the failure section.