Square D SDT120 Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Quantity
Square D SDT120 - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Description
Built for residential applications, this 20A single-pole breaker delivers reliable thermal-magnetic protection for standard household circuits. It is specifically designed to support legacy electrical infrastructure. The plug-on design ensures a secure fit into Square D Trilliant load centers, providing a straightforward replacement solution for aging panels. Featuring a 10 kAIC rating at 120/240V, this breaker includes a Visi-Trip indicator for fast troubleshooting and is HACR rated.Specifications
| Brand | Square D |
|---|---|
| Series | SDT |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Square D Trilliant Load Centers |
| Wire Gauge | 14-8 AWG |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Standards | UL 489 |
|---|---|
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
6 answersCan I use the SDT120 in a Square D QO or Homeline panel?
No. The SDT120 features a unique plug-on footprint that is only compatible with legacy Square D Trilliant load centers. It is not interchangeable with QO or Homeline breakers.
Is the Square D Trilliant series still in production?
No, the Trilliant line is obsolete. The SDT120 is used strictly as a direct replacement to maintain existing Trilliant load centers without requiring a full panel upgrade.
What does the LI trip function indicate on this breaker?
The LI designation means the breaker provides Long-Time and Instantaneous trip functions. The thermal element handles long-time overload protection, while the magnetic element provides instantaneous tripping during short circuits.
Is the SDT120 suitable for heating and cooling equipment?
Yes, this breaker is HACR rated, making it approved for use with heating, air conditioning, and refrigeration equipment that requires a 20A circuit.
How can I tell if the SDT120 has tripped?
This breaker features a Visi-Trip indicator. When the breaker trips due to an overload or short circuit, a red indicator appears to help you quickly identify the faulted circuit.
Does this breaker require a separate neutral wire connection?
No, the SDT120 is a standard single-pole breaker and does not feature a pigtail or plug-on neutral connection. The circuit neutral connects directly to the panel neutral bar.
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