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You searched for: Aube Tech Honeywell RC840T Relay With built-in 24V Transformer. Compatible with 2- and 3-wire thermostats
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Aube RC840T Series Relay With Transformer



This easy-to-install relay features instant activation and is compatible with 2- and 3-wire thermostats. This all-in-one relay includes a built-in 24V transformer.


Models and Ratings

  • RC840T-240 4575 W @ 208 V 22 A resistive FLA 13 / LRA 42

  • 5280 W @ 240 V 22 A resistive FLA 12 / LRA 42

  • RC840T-277 5260 W @ 277 V 19 A resistive

  • RC840T-347 6245 W @ 347 V 18 A resistive

  • All above models operate on 50/60 Hz



  • Control Signal: 24 VAC / 40 mA

  • Transformer Ratings: 24 VAC / 1.2 VA / Class 2

  • Humidity Limits: 0 to 95 % non-condensing

  • Terminal Wire Size: 12 AWG

  • Dimensions (H-W-D): 68 x 82 x 36 mm, 2.7 x 3.2 x 1.4 inches



  • Direct Replacement For Any Brand Name Relay

  • Built-In 24V 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-Sound Proofed Relay Ensures Quiet Operation

  • Low Current Consumption Means Multiple Relays Can be Controlled by a Single Thermostat

  • Heating Command Indicator Light Gives At-a-Glance Verification of Relay Operation

  • Terminal Board Connection Enables Easy Installation

Installation Instructions
Item CodeDescriptionVendorQuantity
RC840T-240 Electromechanical Relay
Honeywell (Aube Technologies) 5280W 240V 22A or 4575 W @ 208 V 22A Resistive. Electromechanical relay with 24 V- 208/240 V transformer. Compatible with 2- and 3-wire thermostat, this all-in-one relay includes a built-in 24 V transformer
RC840T-277 Electromechanical Relay
Honeywell International (Aube Technologies) 5260 W @ 277 V, 19 A. Electromechanical relay with transformer
RC840T-347 Electromechanical Relay
Honeywell International (Aube Technologies) Electromechanical relay with transformer