PTC Air Heaters – MSH Type

MSH Type PTC Air Heaters – Multi-Stage Heating Solution

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, lower energy consumption, and extended heater lifespan, making them ideal for applications where efficiency and durability are critical.

Compared with Standard PTC Air Heaters (single-stage), the MSH type offers greater adaptability for various heating demands in automotive, industrial, and HVAC systems.

If you require multiple stage heating in your application design, please contact our Sales Representatives in advance for special design and wiring.

PTC has a unique heat property that allows the PTC heat output to be regulated by the airflow applied. The higher the airflow, the higher the heat output and power(wattage). Hence depending on the end design, if the ambient temperature is high, the PTC output power will decrease, if the airflow is high with low ambient temperature, then the PTC output power will increase.

Key Features

• Multi-Stage Heating Control: Operates 1, 2, or 3 tubes individually for adjustable power.
• Energy Efficiency: Reduces power consumption by activating only the required heating stages.
• Extended Lifetime: Lower stress on heating elements enhances durability.
• High Safety: Built-in PTC characteristics prevent overheating.
• Flexible Applications: Suitable for EV heating systems, battery thermal management, HVAC, and industrial drying systems.

 

Technical Specifications (MSH Type)

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

• MSH Type 200V~240V Specifications
• MSH Type 100V~120V Specifications
• MSH Type Accessories
• PTC Air Heater Datasheet Download (PDF)

3D Models & Custom Design Support

Explore interactive 3D models for both MH and MHW variants directly on our site. Need integration support or STEP files?

Need integration support on 3D simulations or STEP files? Contact our team for exclusive technical support and CAD resources!

MSH Type – 3D Model

👉 Hover over the product to preview the 3D model.

MSHW Type – 3D Model

 

Typical Applications

• Electric Vehicle (EV) Heating – Cabin air heaters, defrost systems, and auxiliary heating
• Battery Thermal Management Systems (BTMS) – Multi-stage heating to stabilize battery temperature
• HVAC & Air Handling Units – Efficient, adjustable heating in ventilation systems
• Industrial Equipment – Drying, dehumidification, and controlled air heating processes

Part Numbering

Notes on Part Numbering

1. PTC FIN PITCH (MSH-XXXXM):

• The Power(W) in the Specifications table is based on PTC air heaters with fin pitch 1.68mm(M).
• The power(W) of PTC air heater with fin pitch 2.6mm(B) is 90% of PTC air heater with fin pitch 1.68mm(M)

2. PTC INSULATION (MSH-XXXXM-XXXS):

• The Power(W) in the Specifications tables are based on PTC air heaters with Single Insulation(S).
• The price of PTC air heaters with double insulation(D) is 20~30% more than single insulation(S) PTC air heaters.
• The power(W) of PTC air heater with double insulation(D) is approximately 10% less than PTC air heater with single insulation(S).
• The PTC air heater with Double Insulation(D) does not have electrode potential on the fins. It is suitable for use where the device may be in contact with other conductive materials (eg. metal); expose to high humidity; with shock resistance requirement; or in products that require superior stability and quality (eg. automobiles).

3. ACCESSORIES (MSH-XXXXM-XXXSX):

• The “Other Accessories” in 4, 5, 8, B and D of Part Numbering will not include Thermostat for PTC air heaters with Maximum Inrush greater than 14A.
• However, if specifically require thermostat to be included, please advise our Sales Representatives for possible alternatives.

 

Specifications (200V~240V)

• Items that are highlighted in the table are standard models. The delivery time for these models are shorter and more economical.
• Customized wattage, length and specifications can also be designed for large quantity.
• The Power(W) specified in the table above is based on PTC heaters with fin pitch 1.68mm(M) and single insulation(S). Double insulated(D) PTC heaters will have 10% less power than specified in the table above (as power in table is based on single insulation).
  (Model: MSH-2XXXM-XXXS)

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Specifications (100V~120V)

• Items that are highlighted in the table are standard models. The delivery time for these models are shorter and more economical.
• Customized wattage, length and specifications can also be designed for large quantity.
• The Power(W) specified in the table above is based on PTC heaters with fin pitch 1.68mm(M) and single insulation(S). Double insulated(D) PTC heaters will have 10% less power than specified in the table above (as power in table is based on single insulation).
  (Model: MSH-1XXXM-XXXS)

Why Choose KLC’s MSH Type Heaters?

• Over 40 years of thermal innovation since 1982
• Proven reliability in EVs, industrial systems, and HVAC
• Custom-engineered to meet OEM and ODM requirements
• Certified to international standards (IP-rated and voltage-tested)

FAQs

Q1: What is the advantage of MSH over Standard PTC Air Heaters?
A: MSH heaters provide multi-stage power control, reducing energy costs and extending lifespan, while Standard models run only at full power.

Q2: Can I customize the number of heating stages?
A: Yes. The MSH type can be designed with 1, 2, or 3 heating tubes operating independently.

Q3: Are MSH PTC Air Heaters suitable for EV applications?
A: Absolutely. They are widely used in EV cabin heating and battery temperature regulation.

Q4: What voltage ranges are available?
A: Standard designs cover 12V ~ 600V AC/DC, with customization available for specific projects.

Q5: How do I order a custom MSH heater?
A: Please contact our Sales Representatives to discuss design requirements, power stages, and wiring options.

ACCESSORY 1 : PTC + Mounting Frame 

Temperature-resistant plastic frame that safely holds the PTC heating element.

 

Choose from one of the following models:

• Model : MSHF-70 (for Length = 70mm)
  Part Number: MSH-XXXX-70X1
• Model : MSHF (compact housing for Length = 70mm)
  Part Number: MSH-XXXX-70X3
• Model : MHF-90 (for all Lengths and Models)
  Part Number: MSH-XXXX-XXX2

 

ACCESSORY 2 : PTC + Mounting Frame + FAN + Accessories

You can also purchase our total solution of PTC heater assembly, which includes :

• a PTC Heater (MSH Model with length = 70mm)
• a set of temperature -resistant plastic frame (Frame Model: MSHF-70)
• a standard 92mm x 92mm ball axial fan
• a thermostat
• a terminal wire set
• fuse
• and screws (if pre-assembled using:MSH-XXXX-70XAa).

Part Number:

MSH-XXXX-70XA (all accessories separate)
MSH-XXXX-70XAa (all accessories assembled)