SWB511
C-Wire Adapter for 24VAC Thermostats
Reconfigures existing 3- or 4-wire heating and cooling wiring to power a 24VAC thermostat, with no new cable runs.
Overview
Most Wi-Fi thermostats with smart features need to be powered all the time, so they need a constant 24 VAC power source — typically called a C-wire. When the wall does not have a C-wire, the SWB511 reconfigures the existing wires to power the thermostat, without installing new wires throughout the home.
Key Features
- Powers a 24 VAC thermostat without a C-wire — it supplies the constant 24 VAC the thermostat needs to stay on.
- Uses the wiring already in the wall — it reconfigures existing wiring in most 3- or 4-wire heating or cooling systems.
- No new wires through the home — a retrofit does not require installing new thermostat wire.
- Installable by contractors and homeowners — the datasheet lists both professional contractors and DIY homeowners.
- Works with the PCT513, PCT513-TY, PCT523-W-TY, PCT5231-W-TY, PCT533-W-TY, PCT533C-W-TY, PCT503 and PCT503-W thermostats.
Compatibility
Compatible with the PCT513, PCT513-TY, PCT523-W-TY, PCT5231-W-TY, PCT533-W-TY, PCT533C-W-TY, PCT503 and PCT503-W thermostats. For other models, contact us before ordering — we will not claim compatibility we have not confirmed.
Operating environment
Rated for -20 °C to +55 °C and up to 90% relative humidity, non-condensing.
Specifications
| Voltage | 24 VAC |
|---|---|
| Operating Temp | -20 °C to +55 °C |
| Dimensions | 64 (L) × 45 (W) × 15 (H) mm |
| Weight | 8.8 g |
| Compatible With | PCT513, PCT513-TY, PCT523-W-TY, PCT5231-W-TY, PCT533-W-TY, PCT533C-W-TY, PCT503, PCT503-W |
Key Benefits
Powers Without a C-Wire
Supplies the constant 24 VAC a Wi-Fi thermostat needs, with no C-wire at the wall.
Reuses Existing Wiring
Reconfigures the wires already in the wall in most 3- or 4-wire heating or cooling systems.
No New Cable Runs
A retrofit does not require installing new thermostat wire through the home.
Contractor or DIY Install
The datasheet lists both professional contractors and DIY homeowners as able to install it.
Ideal For
Common deployment scenarios where C-Wire Adapter for 24VAC Thermostats delivers the most value.
No-C-Wire Walls
The case the datasheet addresses: a wall with no C-wire to power the thermostat.
3- and 4-Wire Systems
Heating or cooling systems wired with 3 or 4 wires, as listed in the datasheet.
Our Thermostat Range
Confirmed compatible with the PCT513, PCT513-TY, PCT523-W-TY, PCT5231-W-TY, PCT533-W-TY, PCT533C-W-TY, PCT503 and PCT503-W.
Retrofit Work
Installed without running new thermostat cable through the building.
Frequently Asked Questions
What is a C-wire, and why does my thermostat need one?
What does the SWB511 do if my wall has no C-wire?
Will it work with my existing wiring?
Which thermostats is it compatible with?
Can a homeowner install it?
Related Products
Interested in C-Wire Adapter for 24VAC Thermostats?
Download the datasheet or request pricing — our team will respond within 24 hours.
Our engineers usually reply within one business day.