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Robertshaw 5300-621 electric thermostat with 36 in capillary and 12 1/2 in sensing bulb

Robertshaw

Robertshaw 5300-621 Electric Thermostat 36 in capillary 12 1/2 in bulb 2 in stem

SKU CH-CRPK-GGJKN

Electric thermostat with a 36 in capillary, 12 1/2 in sensing bulb and 2 in stem for precise temperature control

  • 36-inch capillary enables remote temperature sensing
  • 12 1/2-inch bulb provides accurate thermal response
  • 2-inch stem fits standard mounting configurations
  • Robertshaw 5300 series delivers reliable HVAC control
  • Electric thermostat designed for RV heating and cooling systems

Direct-fit electric thermostat

The Robertshaw 5300-621 is a direct-fit electric thermostat built for RV heating, ventilation and air-conditioning systems. It uses a 36 in capillary tube and a 12 1/2 in sensing bulb to deliver accurate temperature control in mobile applications.

Replaces worn original controls

This unit replaces a failed or out-of-calibration factory thermostat without rewiring or bracket changes. The 2 in stem matches the original mounting depth so the swap is complete when the capillary and bulb are routed to the same locations.

Suits RV owners restoring stock function

Owners who need the original temperature range and capillary length will find this a straightforward renewal. Builders converting to digital controls or needing a different bulb diameter should look at other options.

Highlights

  • 36-inch capillary enables remote temperature sensing
  • 12 1/2-inch bulb provides accurate thermal response
  • 2-inch stem fits standard mounting configurations
  • Robertshaw 5300 series delivers reliable HVAC control
  • Electric thermostat designed for RV heating and cooling systems

Specifications

BrandROBERTSHAW

Questions about this item

What cut-out size fits the 2 in stem on the 5300-621 thermostat?

The 2 in stem requires a matching 2 in mounting hole or bracket opening; verify the panel thickness before drilling.

Which wiring step on the 5300-621 is most often done incorrectly?

Connecting the line and load wires to the wrong terminals is the common error; follow the terminal markings on the switch body exactly.

When should the 36 in capillary and 12 1/2 in bulb assembly be replaced?

Replace the capillary-bulb assembly if the tube is kinked, the bulb is dented, or the thermostat no longer holds the set temperature.

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