Heat generation from internal electric components inside cabinets is normal, yet accumulated heat brings hidden risks. Long-term overheating cuts the service life of circuit breakers and contactors by half; variable frequency drives (VFDs) will trigger overheat alarm and shut down directly.
Core rule for cooling selection: Calculate total heat load first before picking cooling type.
| Solution | Applicable Heat Load | Working Principle |
|---|---|---|
| Natural Ventilation (perforation/louver vent) | ≤200W | Rely on natural thermal convection; low protection rating ≤IP30 |
| Forced Ventilation (axial cooling fans) | 200～500W | Matched intake & exhaust fans with dust filter screens |
| Heat Exchanger | 500～1500W | Isolated internal/external air circulation, maintains IP54; ideal for dusty & corrosive surroundings |
| Cabinet Air Conditioner | ≥1500W | Active refrigeration; for high-power VFD cabinets & outdoor enclosures |
