Danfoss 120Z0391 Surface Sump Crankcase Heater 80W 460V

The Danfoss 120Z0391 is an 80-watt, 460-volt surface sump heater — also commonly referred to as a crankcase heater — designed as a genuine OEM spare part and accessory for Danfoss commercial scroll compressors. It carries both CE and UL certifications, confirming compliance with international and North American safety standards.

Surface sump heaters play a critical role in compressor protection. By maintaining oil temperature in the compressor sump during off-cycles and standby periods, the heater prevents refrigerant from migrating into and diluting the compressor oil. This ensures proper lubrication viscosity at startup and significantly reduces the risk of liquid slugging, protecting the internal scroll components and extending compressor service life.

Key Features:

• Power Rating: 80 Watts
• Supply Voltage: 460V
• Certifications: CE mark, UL listed
• Type: Surface-mount crankcase / sump heater
• Packaging: Available in multipack of 8
• OEM Danfoss spare part for commercial scroll compressor lines

The 120Z0391 mounts directly to the exterior surface of the compressor sump, ensuring efficient direct-contact thermal transfer. It is the 460V variant in the Danfoss 80W surface sump heater family, which also includes the 120Z0390 (400V) and 120Z0402 (575V) for other voltage requirements. Always verify your compressor model and voltage supply before installation.