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5BLR77L3C7A with 250°F thermostat w/explosion proof wiring enclosure
  • 5BLR77L3C7A with 250°F thermostat w/explosion proof wiring enclosure
  • Watlow 5BLR77L3C7A explosion proof immersion heater

BLR77L3C7A screw plug immersion heater

  • Comes with an explosion proof wiring enclosure and a thermostat
  • DPST on/off from 100°F to 550°F with a differential up to 22°F 
  • the heater has (3) 316-ss passivated 7.625-inch length heating elements
  • with epoxy resin end seals rated at 194°F and a thermowell for sensor.
  • The heater has no heat the first 2.625 inches from the screw plug and has
  • an approximate shipping weight of 10/lbs.
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Applications that require heating Deionized/Demineralized Water

  • Steam boilers and cooling systems
  • Manufacturing lead-acid batteries
  • Car washes
  • Electronics manufacturing
  • Medical and Pharmaceutical manufacturing
  • Cleaning processes
  • Manufacturing Cosmetics and Personal Care Products

Features & Benefits of the Watlow® immersion heater

The integral thermowell provides a convenient method for temperature sensor insertion and allowing a replacement without draining the fluid being heated. The WATROD™ hairpin bend is re-compacted to maintain the mineral insulation density and maintain the dielectric strength and heat transfer efficiency. The heating element has a bright annealing passivation for corrosion resistance.

NOTE: A NEMA-7 enclosure designated for locations classified as Class-1, Division-1, Groups A,B,C, or D as defined in NFPA 70 is installed on this heater; however, is NOT CERTIFIED as installed on the heater. To obtain CSA certification as explosion proof Class-1, Groups B,C,D as installed on the heater, the end user must provide Watlow® the following intended process conditions: operating temperature, operating pressure, media type being heated, including the installation orientation of the heater (horizontal or vertical).

One conduit hub is supplied as per drawing.

Product Details
1 Item

Data sheet

Nema 7 & 4 hazardous & wet proof
60° ~ 250°F range with up to 12° differential
Line power
240v AC 3-phase delta
3000 watt
2-1/2" NPT screw plug
Immersion Length