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Seifert KH 503-501 500W 120V Fan-Assisted Enclosure Heater, 20 CFM DIN Rail Mount
500W Seifert fan-assisted enclosure heater with 120V input, 20 CFM airflow, self-regulating PTC heat, pilot light, overheat protection, and DIN-rail mounting.
Why Choose the Seifert KH 503-501?
The Seifert KH 503-501 is a 500W, 120V fan-assisted enclosure heater designed for control cabinets that need higher heating capacity and constant warm-air circulation. The integrated 20 CFM fan moves heat through the cabinet to help reduce condensation and maintain a safer minimum internal temperature.
A self-regulating PTC resistor adjusts heating performance as conditions change. The anodized aluminum housing, operating pilot light, built-in overheat protection, and DIN-rail mounting format make this heater a strong fit for industrial automation and electrical control applications.
🔥 500W Heating Power
Provides higher-capacity heat for larger or colder enclosures
💨 20 CFM Airflow
Keeps warm air moving around cabinet components
⚡ 120V Operation
Rated for 120V, 50/60 Hz systems
🌡️ Thermostat Compatible
Supports temperature-based heater control
⚠️ Verify Circuit Load and Cabinet Clearance
Confirm a 120V, 50/60 Hz supply, a maximum current requirement of 4.8A, and sufficient space for unrestricted fan airflow. This model carries an IP20 rating and should be installed inside a suitable protective enclosure.
📋 Protect Enclosure Components from Condensation
Warm-air circulation from the KH 503-501 helps reduce the humidity and condensation that can develop when enclosure temperatures fluctuate. Maintaining a stable minimum temperature supports more reliable operation of controls, terminals, drives, and other electrical equipment.
Key Features and Benefits
- 500W fan-assisted enclosure heater
- 120V, 50/60 Hz rated voltage
- 20 CFM fan airflow
- Self-regulating PTC resistor
- Pilot light indicates operation
- Integrated overheat protection
- Anodized aluminum housing
- DIN-rail mounting
- Thermostat compatible
- IP20 protection rating
- CE and cURus approvals
- RoHS compliant
Technical Specifications
| Brand |
Seifert |
| Model |
KH 503-501 |
| Product Type |
Fan-Assisted PTC Enclosure Heater |
| Heating Power at 50°F |
500W |
| Rated Voltage |
120V, 50/60 Hz |
| Maximum Current |
4.8A |
| Fan Airflow |
20 CFM |
| Heating Element |
Self-Regulating PTC Resistor |
| Operating Temperature |
-13°F to 158°F (-25°C to 70°C) |
| Dimensions |
6.5 in. H x 3.2 in. W x 4.4 in. D |
| Housing |
Anodized Aluminum |
| Connection |
3 Screw Terminals for 14 AWG Stranded or Rigid Wire |
| Mounting |
DIN Rail |
| Ingress Protection |
IP20 |
| Approvals |
CE, cURus |
| Compliance |
RoHS |
🔧 Installation and Setup Overview
1. Verify Heating Requirement: Confirm that 500W is appropriate for the enclosure size, insulation, ambient temperature, and target minimum temperature.
2. Confirm Electrical Supply: Use a 120V, 50/60 Hz circuit with conductors and protection suitable for the listed current.
3. Install on DIN Rail: Position the heater so airflow is not blocked by wiring or nearby devices.
4. Complete Wiring: Connect compatible 14 AWG stranded or rigid conductors at the three screw terminals.
5. Test Operation: Verify the pilot light, fan airflow, and heating function after energizing the circuit.
Follow applicable electrical codes and the manufacturer’s installation instructions.
🏭 Typical Applications
The KH 503-501 is used in industrial control panels, outdoor automation cabinets, machinery enclosures, process-control boxes, and electrical housings that require 120V power, 500W heat, and forced air circulation.
✅ Selection Notes
Select this model for 120V applications that need 500W of heating output. Use the product datasheet to confirm installation dimensions and electrical requirements.
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