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Seifert KH 503-251 250W 120V Fan-Assisted Enclosure Heater, 20 CFM DIN Rail Mount
250W Seifert fan-assisted control cabinet heater with 120V input, 20 CFM airflow, a self-regulating PTC resistor, pilot light, overheat protection, and DIN-rail mounting.
Why Choose the Seifert KH 503-251?
The Seifert KH 503-251 is a 250W fan-assisted control cabinet heater rated for 120V, 50/60 Hz operation. Its integrated 20 CFM fan circulates warm air throughout the enclosure, helping maintain a more uniform temperature and reduce condensation around sensitive electrical equipment.
The heater combines a self-regulating PTC resistor with a pilot light and built-in overheat protection. Its anodized aluminum housing and DIN-rail mounting format support efficient installation in industrial control panels and automation cabinets.
🔥 250W Heating Power
Provides controlled heat for compact and mid-size enclosures
💨 20 CFM Airflow
Moves warm air through the cabinet to reduce cold areas
⚡ 120V Operation
Matches common 120V, 50/60 Hz control cabinet power
🌡️ PTC Heating Element
Self-regulating resistor responds to surrounding temperature
⚠️ Confirm Supply Voltage and Installation Clearance
Verify the required supply voltage before installation. The technical specifications list this model at 120V, 50/60 Hz with a maximum current of 2.4A. Maintain clear airflow around the fan and install the IP20 heater inside a suitable protective enclosure.
📋 Warm-Air Circulation Helps Limit Moisture
Temperature swings inside electrical cabinets can lead to humidity and condensation. By distributing warm air at 20 CFM, the KH 503-251 helps protect internal equipment and supports the minimum temperature needed for reliable operation.
Key Features and Benefits
- 250W fan-assisted control cabinet heater
- 120V, 50/60 Hz rated voltage
- 20 CFM integrated fan airflow
- Self-regulating PTC resistor
- Pilot light for operating status
- Built-in overheat protection
- Anodized aluminum housing
- DIN-rail mountable design
- Compatible with thermostat control
- IP20 protection rating
- CE and cURus approvals
- RoHS compliant
Technical Specifications
| Brand |
Seifert |
| Model |
KH 503-251 |
| Product Type |
Fan-Assisted PTC Enclosure Heater |
| Heating Power at 50°F |
250W |
| Rated Voltage |
120V, 50/60 Hz |
| Maximum Current |
2.4A |
| Fan Airflow |
20 CFM |
| Heating Element |
Self-Regulating PTC Resistor |
| Operating Temperature |
-13°F to 158°F (-25°C to 70°C) |
| Dimensions |
5.3 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. Confirm Heater Size: Verify that 250W of output meets the enclosure heat-loss and minimum-temperature requirements.
2. Check Electrical Supply: Confirm a 120V, 50/60 Hz source and wiring suitable for the specified current.
3. Mount Securely: Install the heater on DIN rail with open space around the fan inlet and warm-air outlet.
4. Connect Wiring: Terminate compatible 14 AWG stranded or rigid conductors at the three screw terminals.
5. Test Operation: Confirm the pilot light, fan airflow, and heating function after power is applied.
Follow applicable electrical codes and the manufacturer’s installation instructions.
🏭 Typical Applications
The KH 503-251 is designed for control panels, automation enclosures, outdoor machinery cabinets, electrical boxes, and other protected housings that need 120V enclosure heating and active air circulation.
✅ Selection Notes
Use this model when the application requires 250W of heating power from a 120V supply. A thermostat can be added when automatic temperature-based control is required.
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