Resideo RC840T-240 Electromechanical Relay
The Resideo RC840T-240 Electromechanical Relay is a dual-voltage (208/240 Vac) solution designed for professionals controlling line-voltage resistive loads from 24V thermostats. Engineered with an integrated transformer, this all-in-one unit provides a 24V/40 mA/1.2 VA control signal, eliminating the need for a separate low-voltage power supply. It is extensively used for electric baseboard heating, radiant ceilings, and convectors, offering a high-capacity 22A resistive rating. The switching relay features epoxy-soundproofing to ensure nearly silent operation, making it ideal for residential bedrooms and living areas where standard contactors might be too disruptive. It supports flexible field wiring with a 12 AWG terminal board connection and is fully compatible with both 2-wire (R, W) and 3-wire (R, W, C) low voltage thermostats, including modern smart thermostats and battery-operated models. The unit operates reliably within a -4°F to 140°F temperature range and provides immediate activation without the delay typical of thermal relays.
Key Benefits- Universal Compatibility: Works as a direct replacement for most brand-name relays in 208V/240V HVAC applications.
- Quiet Operation: Epoxy-encapsulated components prevent the common "click" or hum during on/off switching cycles.
- Simplified Installation: Features a built-in Class 2 transformer and includes a lock-nut for quick securing to junction boxes.
- Multi-Unit Control: Low current consumption (40 mA) allows a single thermostat to control multiple RC840T units for larger zones.
Can I use this relay with a Nest or Ecobee thermostat?
Yes. Because the RC840T-240 is compatible with 3-wire thermostats, it provides the common (C) wire terminal required to power Wi-Fi and smart thermostats without additional hardware.
Is this relay suitable for fast-cycling equipment?
This is an electromechanical relay designed for standard resistive heating cycles. For applications requiring rapid modulation or fast-cycling regulated equipment, a solid-state relay like the RT850T is generally preferred.
What is the maximum amperage this unit can handle?
The unit is rated for a maximum 22A resistive load at 208/240 Vac. For inductive loads, it is rated at 1.0 HP at 208 Vac and 1.5 HP at 240 Vac.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $95.21
-65%$95.21
$33.32Resideo RC840T-240 Electromechanical Relay
The Resideo RC840T-240 Electromechanical Relay is a dual-voltage (208/240 Vac) solution designed for professionals controlling line-voltage resistive loads from 24V thermostats. Engineered with an integrated transformer, this all-in-one unit provides a 24V/40 mA/1.2 VA control signal, eliminating the need for a separate low-voltage power supply. It is extensively used for electric baseboard heating, radiant ceilings, and convectors, offering a high-capacity 22A resistive rating. The switching relay features epoxy-soundproofing to ensure nearly silent operation, making it ideal for residential bedrooms and living areas where standard contactors might be too disruptive. It supports flexible field wiring with a 12 AWG terminal board connection and is fully compatible with both 2-wire (R, W) and 3-wire (R, W, C) low voltage thermostats, including modern smart thermostats and battery-operated models. The unit operates reliably within a -4°F to 140°F temperature range and provides immediate activation without the delay typical of thermal relays.
Key Benefits- Universal Compatibility: Works as a direct replacement for most brand-name relays in 208V/240V HVAC applications.
- Quiet Operation: Epoxy-encapsulated components prevent the common "click" or hum during on/off switching cycles.
- Simplified Installation: Features a built-in Class 2 transformer and includes a lock-nut for quick securing to junction boxes.
- Multi-Unit Control: Low current consumption (40 mA) allows a single thermostat to control multiple RC840T units for larger zones.
Can I use this relay with a Nest or Ecobee thermostat?
Yes. Because the RC840T-240 is compatible with 3-wire thermostats, it provides the common (C) wire terminal required to power Wi-Fi and smart thermostats without additional hardware.
Is this relay suitable for fast-cycling equipment?
This is an electromechanical relay designed for standard resistive heating cycles. For applications requiring rapid modulation or fast-cycling regulated equipment, a solid-state relay like the RT850T is generally preferred.
What is the maximum amperage this unit can handle?
The unit is rated for a maximum 22A resistive load at 208/240 Vac. For inductive loads, it is rated at 1.0 HP at 208 Vac and 1.5 HP at 240 Vac.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Shipping & Returns
Description
The Resideo RC840T-240 Electromechanical Relay is a dual-voltage (208/240 Vac) solution designed for professionals controlling line-voltage resistive loads from 24V thermostats. Engineered with an integrated transformer, this all-in-one unit provides a 24V/40 mA/1.2 VA control signal, eliminating the need for a separate low-voltage power supply. It is extensively used for electric baseboard heating, radiant ceilings, and convectors, offering a high-capacity 22A resistive rating. The switching relay features epoxy-soundproofing to ensure nearly silent operation, making it ideal for residential bedrooms and living areas where standard contactors might be too disruptive. It supports flexible field wiring with a 12 AWG terminal board connection and is fully compatible with both 2-wire (R, W) and 3-wire (R, W, C) low voltage thermostats, including modern smart thermostats and battery-operated models. The unit operates reliably within a -4°F to 140°F temperature range and provides immediate activation without the delay typical of thermal relays.
Key Benefits- Universal Compatibility: Works as a direct replacement for most brand-name relays in 208V/240V HVAC applications.
- Quiet Operation: Epoxy-encapsulated components prevent the common "click" or hum during on/off switching cycles.
- Simplified Installation: Features a built-in Class 2 transformer and includes a lock-nut for quick securing to junction boxes.
- Multi-Unit Control: Low current consumption (40 mA) allows a single thermostat to control multiple RC840T units for larger zones.
Can I use this relay with a Nest or Ecobee thermostat?
Yes. Because the RC840T-240 is compatible with 3-wire thermostats, it provides the common (C) wire terminal required to power Wi-Fi and smart thermostats without additional hardware.
Is this relay suitable for fast-cycling equipment?
This is an electromechanical relay designed for standard resistive heating cycles. For applications requiring rapid modulation or fast-cycling regulated equipment, a solid-state relay like the RT850T is generally preferred.
What is the maximum amperage this unit can handle?
The unit is rated for a maximum 22A resistive load at 208/240 Vac. For inductive loads, it is rated at 1.0 HP at 208 Vac and 1.5 HP at 240 Vac.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
