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Seifert KH 503-400 400W 230V Fan-Assisted Enclosure Heater, 20 CFM DIN Rail Mount
400W Seifert control cabinet heater with 230V input, 20 CFM forced airflow, self-regulating PTC heat, pilot light, overheat protection, and DIN-rail mounting.
Why Choose the Seifert KH 503-400?
The Seifert KH 503-400 delivers 400W of fan-assisted heat for control cabinets that need greater heating capacity and steady internal air movement. Its 20 CFM fan spreads warm air through the enclosure to reduce temperature differences and help prevent condensation from collecting around electrical components.
A self-regulating PTC resistor manages the heating response, while the pilot light provides a clear operating indication and integrated overheat protection adds another layer of protection. The anodized aluminum housing mounts directly to DIN rail for efficient panel installation.
🔥 400W Heating Power
Supports higher enclosure heat-loss requirements
💨 20 CFM Fan
Distributes warm air throughout the control cabinet
⚡ 230V Operation
Rated for 230V, 50/60 Hz applications
🛡️ Protected Operation
Pilot light and integrated overheat protection are built in
⚠️ Match Heater Capacity to the Enclosure
Confirm that 400W is appropriate for the cabinet volume, ambient temperature, insulation, and desired internal temperature. Verify a 230V, 50/60 Hz supply, 1.9A maximum current, and clear fan airflow before installation.
📋 Reduce Condensation in Industrial Control Cabinets
The KH 503-400 maintains warm-air circulation inside the enclosure, which helps reduce the humidity and condensation associated with changing internal temperatures. This supports more reliable operation of controls, terminals, power supplies, drives, and other cabinet-mounted devices.
Key Features and Benefits
- 400W fan-assisted control cabinet heater
- 230V, 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
- Compatible with thermostat control
- IP20 protection rating
- CE and cURus approvals
- RoHS compliant
Technical Specifications
| Brand |
Seifert |
| Model |
KH 503-400 |
| Product Type |
Fan-Assisted PTC Enclosure Heater |
| Heating Power at 50°F |
400W |
| Rated Voltage |
230V, 50/60 Hz |
| Maximum Current |
1.9A |
| 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. Calculate Heating Need: Confirm that 400W matches the enclosure heat loss and environmental conditions.
2. Verify Voltage: Use a 230V, 50/60 Hz source with conductors and protection suitable for the listed current.
3. Install on DIN Rail: Position the heater so the fan can draw and discharge air without obstruction.
4. Complete Connections: Secure compatible 14 AWG stranded or rigid wire at the three screw terminals.
5. Commission the Heater: Apply power and verify the pilot light, fan airflow, and heating performance.
Follow applicable electrical codes and the manufacturer’s installation instructions.
🏭 Typical Applications
Typical uses include machine control panels, industrial automation cabinets, outdoor electrical enclosures, process-control housings, and equipment boxes that need 400W heating with forced air circulation.
✅ Selection Notes
The KH 503-400 is intended for 230V systems that require more heat than a compact 250W model while retaining 20 CFM airflow and DIN-rail mounting.
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