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Selection & support
Keep the cabinet a few degrees above ambient so condensation cannot form.
Small, sealed cabinets usually need only a convection PTC heater: the LEIPOLE JRQ15 to JRQ150 give 15 to 160 W, limit their own surface temperature and mount on a 35 mm DIN rail. Large or outdoor cabinets need a fan heater that spreads the heat evenly; the JRQFM and JRQFS fan heaters run up to 1000 W, and the JRQFS650BA has its own thermostat.
See PTC heatersEnough to keep the inside a few kelvin above the coldest ambient temperature. The LEIPOLE calculator does this in its anti-condensation mode: it keeps the inside 5 K above ambient, or 8 K for very humid air or a large day–night swing, from the cabinet size, material and installation. Switch the heater with a thermostat or a hygrostat so it runs only when needed.
Open the calculator