Electric air heater unit MSH series

ACDChot air

Product Overview
KLC’s MSH-type PTC Air Heaters are engineered with multi-stage heating control, allowing one, two, or three heating tubes to operate independently. This staged design delivers flexible heating output, reduced energy consumption and extended heater lifespan. PTC elements self-regulate according to applied airflow: higher airflow increases heat output and power, while higher ambient temperature reduces PTC output power.

Key Features & Benefits

• Airflow-driven self-regulation
• Multi-stage heating control (1, 2 or 3 tubes) for adjustable power
• Energy-saving operation — activates only required stages
• Adaptable to high and low ambient temperatures
• Extended service life via element cycling and reduced stress on heating elements
• Safety: PTC self-regulation prevents overheating
• Applications across EV heating, battery thermal management, HVAC and industrial drying

Technical Highlights

• Voltage Range: 12V ~ 600V AC/DC (customizable)
• Power Options: Multi-stage design for variable output
• Heating Medium: Airflow heating with tube-type construction
• Control Options: Compatible with custom wiring and power-stage switching
• Safety: Overheat protection by PTC self-regulation
• Customization: Dimensions, tube arrangement and power-stage wiring available on request

Typical Applications

• Electric vehicle cabin heating, defrost and auxiliary heating
• Battery Thermal Management Systems (BTMS) — multi-stage heating to stabilize battery temperature
• HVAC and air handling units — adjustable heating in ventilation systems
• Industrial equipment — drying, dehumidification and controlled air heating processes

Part Numbering & Notes

• PTC fin pitch designation example: MSH-XXXXM — power values based on fin pitch 1.68mm (M); fin pitch 2.6mm (B) yields ~90% of M power
• Insulation: single (S) baseline; double (D) typically reduces power by ~10% and increases price (approx. 20–30%)
• Certain accessory kits exclude thermostats for heaters with inrush >14A; thermostat inclusion requires special arrangement

Accessory Options

• PTC + mounting frame (temperature-resistant plastic frame) — frame models available for different lengths
• Full assemblies: PTC + frame + fan + accessories — or components supplied separately (fan, thermostat, terminal wire set, fuse, screws)

3D Models & Custom Design Support
Interactive 3D models and CAD/STEP files are available for integration and design validation.

Technical Specifications

• Voltage: 12V ~ 600V AC/DC (customizable)
• Configuration: 1, 2 or 3 independently switched heating tubes
• Heating medium: airflow via tube-type design
• Options: fin pitch M = 1.68 mm or B = 2.6 mm; insulation S or D; custom wiring and layouts on request