The SHT25W by Alfa Electric is a compact PTC heater designed for electrical enclosures and automation systems. It’s part of the SHT/W series, known for its wire-connected, self-regulating heating elements.

 Key Features

• Heating capacity: 25W (at 20°C ambient)
• Power supply: 110–250V AC or DC
• Heating element: PTC resistor (self-regulating)
• Inrush current: 2.5A
• Recommended fuse: 4A
• Electrical connection: Silicon cable, 2×0.5 mm², 400 mm length
• Protection class: Class II
• IP rating: IP20
• Operating temperature: –45°C to +70°C
• Storage temperature: –45°C to +80°C
• Mounting: DIN rail 35 mm (EN50022)
• Dimensions: 60×50×80 mm
• Weight: ~0.24 kg
• Installation position: Vertical for best efficiency