Printer friendly page

Honeywell RC840T-347 Electromechanical Relay

SKU: 375896

Save 58% · Retail: $128.94

  Available to Ship in 3-4 weeks

Ships From Price Qty
Order From Manufacturer
Available to Ship in 3-4 weeks

About the Honeywell RC840T-347

Honeywell RC840T-347 Electromechanical Relay with built-in 24 V - 347 V Transformer. Compatible with 2- and 3-wire thermostat, this all-in-one relay includes a built-in 24 V Transformer

Product Details

Manufacturer: Honeywell
Style: Parts
Mpn # RC840T-347
Weight 0.05 lbs.

Product Features

  • Direct replacement for any brand name relay
  • Built-in 24 V transformer for easy installation.
  • Compatible with 24V thermostats with 2-wire connections (R,W) or 3-wire connections (R,W,C)
  • Immediate relay activation provides improved temperature control and comfort
  • Epoxy-soundproofed relay ensures quiet operation
  • Terminal board connection enables easy installation
  • Low current consumption means multiple relays can be controllers by a single thermostat


4.5 out of 5 rating is our rating for PlumbersStock, we got that rating because we have lots of experience and great people with expertise in plumbing. BUT WE WANT YOUR HELP. This product doesn't have any reviews yet, and we don't want to write our own reviews. It is more valuable to us that the customers get to share their experience with our products. Please, if you have any experience with this product, take a moment to share and help someone else who is trying to make a decision. Thank you!

Questions & Answers


Good day! We're glad that you're interested in our Honeywell RC840T-347 Electromechanical Relay. This is compatible with 24V thermostats with a 2-wire and a 3-wire connections thermostat. You may refer to this specification sheet to know more information about this product. If you are all set to purchase this item, just click on Add to Cart. Enter your zip code to get a shipping cost estimate and proceed to checkout to begin the ordering process. Thanks for choosing as your online shopping buddy. Have a great week!

Shopper Award