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More than 5,000 of our patented standard Ultra Thin Flexible Heaters are CSA, UL, CE recognized and also REACH, RoHS compliant.
(cUL File Number: E315621 / CE: IEC60335-1:2010 & EC60335-1:2012)
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High Voltage PTC Heaters
High Voltage PTC Heaters for Electric Vehicles & Industrial Applications
KLC High Voltage PTC Heaters deliver fast, reliable, and energy-efficient heating across a wide voltage range from 12V to 999V, with UL/CSA approvals for 12V–600V systems. Designed for electric vehicles, industrial machinery, and battery heating, our heaters ensure stable thermal performance while extending equipment life and optimizing energy usage.
With decades of R&D experience and IATF 16949-certified manufacturing, KLC provides customizable solutions tailored to your specific high-voltage heating needs.
Key Features
- Self-Regulating Technology: Automatically limits current as temperature rises, preventing overheating and energy waste.
- Wide Voltage Range: 12V ~ 999V (UL/CSA approved: 12V ~ 600V), compatible with EVs, industrial machinery, and high-power systems.
- High Power Output: Up to 30,000W (depending on size and design) for fast heating even in extreme environments.
- Multi-Stage Heating: Adjustable power output for optimized energy use, cabin comfort, or process heating.
- Safety & Reliability: Certified under IATF 16949, with UL, CSA.
- Versatile Applications: EV cabin heating, battery heating, cold-start assistance, industrial heating, and more.
High Voltage PTC Heater Models
UL/CSA approvals for 12V–600V
12V~999V: STW type
12V~500V: MH(W), MSH(W), SH(W), TH(W) and OH(W) types
| Voltage Range | Model | Dimensions (mm) | Tube No. | Fin Width (mm) | Fin Pitch (mm) | Standard | Wired |
|---|---|---|---|---|---|---|---|
| 12~500V | MH(W)
|
26 x 90 x L (70~492) | 2 or 3 | 90 | 1.2 / 2.0 / 2.6 | Terminal type | Available |
| 12~500V | MSH(W)
|
26 x 65 x L (70~492) | 3 | 65 | 1.68 / 2.6 | Terminal type | Available |
| 12~500V | SH(W)
|
26 x 65 x L (70~492) | 2 | 65 | 1.68 | Terminal type | Available |
| 12~500V | TH(W)
|
26 x 45 x L (70~492) | 2 | 45 | 2.0 | Terminal type | Available |
| 12~500V | OH(W)
|
26 x 30 x L (30~492) | 1 | 30 | 1.68 | Terminal type | Available |
| 12~ 999V | STW
|
10 x 10 x 10 ~ 999 × 337.5 × 25 | – | – | – | – |
Applications
- Charging Stations: Efficient heating during battery charging, especially in cold climates, improving charging efficiency and equipment longevity.
- Electric Trucks: Consistent heating for vehicle performance, passenger comfort, and component protection.
- Electric Buses: Stable cabin and system heating, enhancing passenger comfort and operational efficiency.
- Construction Machinery: Uniform heat for electric construction equipment, preventing downtime due to cold temperatures.
- Agricultural Machinery: Maintains optimal temperatures for electric agricultural machinery for effective operation.
- Electric Cars: Rapid cabin and component heating, improving comfort and energy efficiency.
- Special Electric Vehicles: Ideal for emergency vehicles, service trucks, and other specialized EVs requiring precise heating.
- Industrial Equipment: Supports machinery requiring controlled heating for processes or sensitive components.
- Railway & Special-Purpose Vehicles: Reliable heating in harsh operational environments.
- HVAC Systems: Efficient air heating for commercial and residential buildings.
Request a Custom Solution →Contact KLC Team Now!
Why Choose KLC High Voltage PTC Heaters?
- Fast Warm-Up – Efficient heating even at -20℃ cold-start conditions.
- Energy Efficient – Reduces power consumption up to 20% compared with conventional heaters.
- Automotive & Industrial Grade – IATF 16949 certified, UL, CSA approvals ensure global compliance.
- Engineering Support – Full 3D simulations, lab testing, life-cycle validation, and integration assistance.
- Customizable Designs – Flexible sizing, power output, and voltage options to meet your system needs.
Technical Specifications
| Range | |
| Voltage | 12V ~ 999V (UL & CSA approved: 12V ~ 600V) |
| Power Output | Up to 30,000W (depends on size & design) |
| Heating Element | PTC Ceramic (self-regulating) |
| Certifications | IATF 16949, UL, CSA, VDE (optional) |
| Applications | EV cabin heating, battery heating, industrial heating, cold-start assistance |
STW Series vs. MH/MSH/SH/TH/OH Series: Which High Voltage PTC Heater Fits Your Application?
KLC’s High Voltage PTC Heater line splits into two product families. Choosing between them comes down to voltage class and customization needs:
| Criteria | MH/MSH/SH/TH/OH | STW Series |
| Voltage range | 12V–500V | 12V–999V |
| UL/CSA certification | Standard up to 500V | Standard up to 600V; custom certification pathway above 600V |
| Best for | 400V EV platforms, standard industrial/HVAC equipment, fast-turnaround projects | 800V+ EV platforms, electric trucks/buses, industrial systems needing >600V isolation |
| Form factor | Fixed tube/fin geometry (26mm series widths) | Fully custom, 10×10×10mm to 999×337.5×25mm |
| Lead time | Shorter — standard catalog parts | Longer — most configurations are custom-engineered |
| Typical customer | OEMs with established 400V designs needing drop-in replacement | OEMs designing next-gen 800V+ platforms or needing a non-standard housing |
Still unsure which series fits? Send your voltage, power, and dimension requirements and KLC’s engineering team will recommend a specific model within one business day.
FAQs – High Voltage PTC Heaters
- What voltage ranges do KLC High Voltage PTC Heaters support?
KLC’s High Voltage PTC Heaters cover 12V to 999V, with UL/CSA certification standard for systems up to 600V. The MH, MSH, SH, TH, OH handle 12V–500V applications, while the STW series extends to 999V with fully custom sizing — covering everything from auxiliary 12V systems to 800V+ EV and industrial platforms.
- What are the available models for 400~500V applications?
Five model families cover the 400–500V range: MH(W), MSH(W), SH(W), TH(W), and OH(W) — each with different fin widths (30mm to 90mm) and tube configurations (1 to 3 tubes) to match airflow and power requirements. All are available in both terminal and pre-wired versions for faster integration. Learn more…
- Are KLC’s high voltage PTC heaters certified for global markets?
Yes. All models are manufactured under IATF 16949 (automotive quality management) and ISO 9001:2015, with UL and CSA certification standard for systems up to 600V. VDE certification is available for European markets, and KLC’s engineering team supports custom certification pathways for systems operating above 600V DC.
- What applications are KLC’s high voltage PTC heaters suitable for?
EV cabin & battery heating, charging stations, electric trucks & buses, construction & agricultural machinery, special-purpose vehicles, industrial equipment, railway applications, HVAC systems.
- Do they come with wired options?
Yes, all 400~500V models are wired as standard, reducing intergration time for OEM assembly line; STW series wiring is fully customizable to match your connector and harness specifications.
- How to choose the right model?
Depends on voltage, dimensions, power, operating temperature, and application. KLC’s engineers can provide guidance for optimal selection. See step by step guide to select your PTC heater and Contact us for your thermal solutions.
- Is a high voltage PTC heater (above 500V) safe to integrate into my system?
Yes. KLC’s STW series adds galvanic isolation and built-in thermal fuses as standard on all 400V+ models, on top of the inherent self-regulation of the PTC ceramic element itself — the element physically cannot draw enough current to overheat, regardless of voltage class. This makes high-voltage PTC heating safer to integrate than fixed-resistance alternatives, which require external control circuitry to achieve comparable protection.
- What’s the difference between the STW series and the MH-family series?
The MH-family (MH, MSH, SH, TH, OH) covers 12V–500V using fixed catalog dimensions, suited for fast-turnaround standard projects. The STW series extends to 999V with fully custom sizing — from 10×10×10mm up to 999×337.5×25mm — making it the choice for 800V+ EV platforms, electric trucks, and any application needing a non-standard housing or higher voltage isolation.
- How do I get a quote for a custom high voltage PTC heater?
Send KLC your target voltage, power requirement, mounting dimensions, and certification needs (UL/CSA/VDE) — our team responds to technical inquiries within one business day and can provide 3D STEP files or sample units to support your design evaluation before final quoting.
