Electric air heater unit MH (w) series

wall-mountedindustrial

Overview
PTC MH-type air heaters provide multi-stage power control for targeted heating in automotive, industrial and HVAC equipment. Configurable for one, two or three independent heating tubes to reduce inrush current and improve operational efficiency.

Multi-Stage Heating (MH Type)
The MH configuration allows selective activation of heating elements (1–3 tubes), enabling staged power delivery that lowers peak load and extends component life.

Engineering Features & Benefits

• Reduced inrush current and power spikes through staged switching
• Improved energy consumption and operational efficiency
• Reduced thermal stress for longer heater life
• Precise thermal control suitable for automotive, industrial and HVAC systems
• Customizable options for voltage, fin pitch, insulation and length

PTC Self-Regulation & Airflow Dynamics
PTC ceramic elements self-regulate heat output relative to airflow: increased airflow raises heat output and wattage while self-limiting temperature prevents overheating.

• Higher airflow increases thermal output and power (W)
• Self-limited temperature for safe operation
• Consistent heat delivery and energy efficiency under varying conditions

Technical Specification Notes
Specifications are provided for 200V–240V and 100V–120V ranges. Power values reference fin pitch 1.2mm (S) and single insulation (S). Custom wattage, lengths and configurations are available for volume orders.

Part Numbering & Notes

• FIN PITCH (MH-XXXXS): 1.2mm (S) is base; 2.0mm (N) ≈95% of S; 2.6mm (B) ≈90% of S.
• INSULATION (MH-XXXXS-XXXS): Single insulation (S) is base; double insulation (D) reduces power ≈10% and increases cost (~20–30%), and removes electrode potential on fins for humid/conductive environments.
• Accessories: certain accessory codes exclude thermostats for heaters with maximum inrush >14A; consult ordering options for alternatives.

Accessories & Assemblies

• PTC + mounting frame (examples: MHF-93, MHF-106, MHF-128, MHF-90)
• Complete assemblies: PTC heater + frame + 120×120mm ball-bearing axial fan + terminal wire sets + thermostat + safety fuse + mounting screws (part numbers MH-XXXX-128XA / MH-XXXX-128XAa)

Additional Information
Standard models highlighted in specifications have shorter lead times and lower cost. Custom designs for voltages, lengths, wattages, fin pitch and insulation are available for large-quantity orders.

Technical Specifications

• Model series: MH Type (PTC air heaters)
• Multi-stage power control: 1–3 independent heating tubes
• Voltage ranges: 200V–240V and 100V–120V
• PTC behavior: positive temperature coefficient, self-regulating with airflow
• Fin pitch options: 1.2mm (S) base; 2.0mm (N) ≈95% power; 2.6mm (B) ≈90% power
• Insulation options: Single (S) base; Double (D) ≈10% less power, higher cost, no electrode potential on fins
• Available mounting frames: MHF-93, MHF-106, MHF-128, MHF-90
• Accessory assemblies: fan, terminal wire sets, thermostat, fuse and mounting hardware