Electric air heater unit STW series

three-phaseelectric powerwall-mounted

Short features

• UL-standard high-voltage insulation
• Multi-phase / homogeneous 3-phase connection on request
• Wire-terminated versions; extensive size customization
• UL, CSA (where applicable) and CE recognitions
• Project-based IP68 waterproof variants available via third-party certification
• Related high-voltage families: MH, MSH, SH, TH, OH

Product overview
KLC's STW Series high-voltage PTC air heaters are engineered for advanced thermal management in demanding industrial and transport applications. The STW design provides UL-standard insulation for safe high-voltage operation, supports PWM control and can be configured for homogeneous 3-phase connection on request. Units are supplied primarily as wire-terminated elements and allow wide dimensional and power customization to fit vehicle HVAC, charging infrastructure and industrial equipment integration. External frames or housings are recommended where additional mechanical robustness is required.

Specification range

• Voltage: 12 V to 999 V (UL/CSA approval scope: 12 V to 600 V)
• Power capability: up to 30,000 W (design-dependent)
• Size range: min. 10 × 10 × 10 mm; max. 999 × 337.5 × 25 mm
• Standard thickness options: 10 mm, 20 ±0.5 mm (table examples), 25 mm

Key features

• UL-standard high-voltage insulation: enables safe integration in high-voltage circuits.
• Multi-phase control: supports homogeneous 3-phase connection for optimized thermal distribution.
• Customization: wide range of widths, lengths and power ratings to meet application constraints.
• Global recognitions: UL, CSA (where applicable) and CE for international markets.
• Waterproof options: IP68 variants available as project-based options with third-party certification.

Benefits

• Fast heat-up: reduces vehicle and equipment warm-up time.
• Compact integration: thin, modular elements that fit confined housings.
• Stable performance: maintains heating output under supply fluctuations.
• High power capability: scalable to tens of kilowatts depending on design.
• Precise control: PWM compatibility for smooth temperature regulation.

Applications

• EV charging stations (pre-heating during charging in cold climates)
• Electric trucks and buses (cabin and component heating)
• Construction and agricultural electric machinery
• Electric cars (cabin and subsystem heating)
• Special electric vehicles (emergency, service)
• Industrial equipment requiring precise temperature control
• Railway and special-purpose vehicles operating in harsh environments
• HVAC systems for commercial and residential buildings

Model selection (examples)
Item | W(mm) | L(mm) | T(mm) | Model No. | Max Power @ air speed 6.4 m/s
1 | 40 | 49 | 20±0.5 | STW-X040202N1Z(P)XX | ≦140W
2 | 40 | 73 | 20±0.5 | STW-X060203N1Z(P)XX | ≦210W
3 | 40 | 96 | 20±0.5 | STW-X080204N1Z(P)XX | ≦245W
4 | 40 | 120 | 20±0.5 | STW-X100205N1Z(P)XX | ≦315W
5 | 40 | 144 | 20±0.5 | STW-X120206N1Z(P)XX | ≦385W
10 | 40 | 360 | 20±0.5 | STW-X300215N1Z(P)XX | ≦980W
20 | 55 | 360 | 20±0.5 | STW-X450315N1Z(P)XX | ≦1470W
30 | 70 | 360 | 20±0.5 | STW-X600415N1Z(P)XX | ≦1960W
40 | 85 | 360 | 20±0.5 | STW-X750515N1Z(P)XX | ≦2450W
50 | 100 | 360 | 20±0.5 | STW-X900615N1Z(P)XX | ≦2940W

Additional notes
Mounting frames, housings, fan frames, protective shields, thermostats, safety fuses and terminal sets are available as accessories and can be customized per customer design. IP68-compliant waterproof variants and third-party certifications are provided on a project basis. 3D preview models and dimensional drawings are available on the product page for integration verification.

Technical specifications

• Series: STW (High-Voltage PTC Air Heaters)
• Voltage range: 12 V to 999 V (UL/CSA approval: 12 V to 600 V)
• Power capability: up to 30,000 W (design-dependent)
• Size range: min 10 × 10 × 10 mm; max 999 × 337.5 × 25 mm
• Thickness options: 10 mm, 20 ±0.5 mm (table), 25 mm
• Certifications: UL, CSA (where applicable), CE
• IP rating: basic water resistance standard; IP68 variants available via third-party certification on request
• Control: PWM capable; supports homogeneous 3-phase connection on request
• Termination: wire-terminated versions (standard)
• Accessories: custom housings/frames, fan housings, protective shields, thermostats, fuses, terminal sets