This page describes a system to power down our two ATCA shelves (and possibly other equipment) on a serious over-temperature condition.
The system consists of a control box and two power boxes, one for the 3-phase shelf and other for the two-phase shelf.

Box wiring diagrams:

* https://github.com/eshazen/ATCAPowerSwitch/blob/main/control/control.pdf
* https://github.com/eshazen/ATCAPowerSwitch/blob/main/three_phase.pdf
* https://github.com/eshazen/ATCAPowerSwitch/blob/main/two_phase.pdf