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Seifert 503401 KH503 400W 120V Control Cabinet Resistor Heater

Seifert KH 503-401 Control Cabinet Heater
Seifert 503401 KH503 400W 120V Control Cabinet Resistor Heater

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Our Price: $150.82
Note: Ships in 3-4 business days
MFG P/N: 503401
MFG: Seifert
Weight (lbs): 2.14

Product Code: 503401


The Seifert KH 503-401 is a 400W, 120V fan assisted resistor control cabinet heater. It has a pilot light that indicates when the heat is on and integrated protection from overheating. It features an anodized aluminum housing and is DIN Rail mountable. Ideal for applications in which a bigger heating capacity or steady air circulation is needed. UL recognized.

  • Fan assisted resistor
  • Lightweight & easy maintenance
  • Fan keeps warm air circulating inside cabinet
  • Lowers chance of condensation build-up
  • Can be used with a thermostat
  • Rated IP 20
  • RoHS compliant


  • Dimensions- 6.5" Height x 3.2" Width x 4.4" Depth
  • Heating Power at 50 F- 400 Watts
  • Operating Temperature Range- -13 F to +158 F (-25 C to 70 C)
  • Rated Voltage- 120V 50/60Hz
  • Max. Current- 3.8 Amps
  • Heating Element Type- PTC self-regulating resistor
  • Fan Airflow- 20 CFM
  • Connection Type- 3 Screw terminals for stranded or rigid wire 14 AWG
  • Approvals- CE, cURus
  • Ingress Protection- IP 20

Seifert 503401 400W, 120V Enclosure Heater

Additional Product Information
When the inside temperature of a control cabinet changes, humidity or condensation can build inside. The additional moisture can cause equipment damage, data loss, or performance failure. Using a fan assisted resistor heater such as the KH 503-401, warmer air can be dispersed easily, lessening the risk. It also helps to ensure a safe minimum temperature if needed. Enclosures that are in outdoor settings receive the most benefit from a heater, as they are exposed to the outside elements.