SNC's Space Systems is the world’s leading supplier of thermal switches for spacecraft. These devices will passively open or close a thermal connection at a particular temperature set point, allowing for payloads with variable heat loads to be passively controlled to a precise temperature. These devices are provided as stand-alone switches, or combined with a thermal radiator to provide a complete thermal solution.
http://spacedev.com/components_mechanisms.php
A fused thermal switch from Apollo Service Module oxygen tank after test at the NASA Manned Spacecraft Center simulatign Apollo 13 de-tanking procedures.
Catalog Date: 06 January 1970
Film Type: 4x5 BW
NASA image: S70-40850
http://www.apolloexplorer.co.uk/photo/html/as13/10075548.htm
Thermal Switch installed on a cryostat base.
http://mechanical-engineering.esa.int/thermal/thermalswitches.html
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