ENMG EAD-2040P Dehumidifier module for industrial electrical cabinets. 40W DIN Rail mount Dimensions (approximate): 160mm H x 120mm W x 80 mm D I've unpacked it and powered it up - otherwise unused. Includes manual (in Chinese, but Google translate works) and a length of silicone hose. Purchased from overseas for a 3D priting filament cabinet project for which it was unsuitable - can't set the RH lower than 45%.
eBay