Magnetic interlocks form part of the warp drive system aboard starships, as part of the warp core assembly. Magnetic interlocks can be disrupted by subspace vacuoles. (VOY: "Emanations")

During the battle with the Duras sisters in 2371, the starboard interlock of the USS Enterprise-D took damage, and required reinforcement. Subsequently, the interlocks ruptured, leading to a coolant leak, and eventually a warp core breach that destroyed the secondary hull. (Star Trek Generations)

Following sabotage by the True Way to the USS Orinoco, the magnetic interlocks on the runabout failed, leading to a warp core breach. The resultant explosion obliterated that vessel. (DS9: "Our Man Bashir")