Square D 992120 Molded Case Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Quantity
Square D 992120 - 20A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for commercial and industrial applications, the Square D 992120 is a 1-pole, 20A molded case circuit breaker from the 99 Series. It provides dependable thermal-magnetic overcurrent protection for branch circuits. This unit installs into Square D ML panelboards, utilizing a secure bolt-on mounting style to ensure a stable connection. It comes equipped with load side lugs for straightforward wiring.Specifications
| Brand | Square D |
|---|---|
| Part Number | 992120-R |
| Series | 99 Series |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 277VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML Panelboards |
| Wire Gauge | 14-10 AWG (Cu), 12-10 AWG (Al) |
| Max Wire | 10 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | UL 489, NEMA AB-1 |
| Approval | UL, CSA |
| Temp Rating | 40°C |
Product FAQs
5 answersWhich panelboards accept the Square D 992120 circuit breaker?
This legacy 99 Series breaker is engineered exclusively for installation in Square D ML panelboards. It is not interchangeable with modern QO, Homeline, or NF series breakers.
How is the 992120 breaker secured within the electrical panel?
It uses a bolt-on mounting configuration, meaning it must be mechanically fastened to the busbar of an ML panelboard rather than snapping into place. This provides a highly secure connection for industrial and commercial environments.
What are the acceptable wire gauges for the load lugs on this 20A breaker?
The integrated load-side lugs accommodate 14 to 10 AWG copper conductors or 12 to 10 AWG aluminum conductors. Always verify local codes and torque requirements when terminating branch circuit wiring.
How does the thermal-magnetic trip mechanism operate on the 992120?
The breaker utilizes a fixed thermal element to detect sustained overloads, providing long-time protection, and a fixed magnetic element to trip immediately during severe short circuits, providing instantaneous protection.
What is the primary application for the 992120 circuit breaker today?
Because it is part of the legacy 99 Series, this breaker is primarily sourced as a direct replacement component for maintaining existing Square D ML panelboard systems rather than for new installations.
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