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CZ6090 PTC Air Heater 220V Power Distribution Cabinet Small Electric Heater. Ultra-compact Design: Small footprint, ideal for narrow spaces in small terminal boxes and compact control enclosures. Flame-retardant Plastic Housing: High-temperature resistant, flame-retardant shell ensures safe operation even in harsh environments. Safe PTC Self-limiting: No open flame, automatic constant temperature control, eliminating overheating risk for unattended use.