The A350E is an on/off electronic cooling only control with SPDT relay output and LED indication.
Besides being a cooling only control, the A350E has two features that
differentiate it from the A350A/B Electronic Temperature Control:
an adjustable minimum setpoint and short/open circuit protection.
The A350E also has an adjustable differential and an interchangeable temperature sensor.
The A350E will accept up to nine S350 Temperature Stage Modules to control a total
of ten stages of cooling.