a resettable device is provided for supporting an object , sensing when an environment reaches a critical temperature and releasing the object when the critical temperature is reached . it includes a flexible container having a material inside with a melting point at the critical temperature . the object &# 39 ; s weight is supported by the solid material which gives rigidity to the container until the critical temperature is reached at which point the material in the container melts . the flexible container with the now fluid material inside has insufficient strength to support the object which is thereby released . biasing means forces the container back to its original shape so that when the temperature falls below the melting temperature the material again solidifies , and the object may again be supported by the device .