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Eaton / Cutler-Hammer BR120ST Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Eaton / Cutler-Hammer
BR120ST
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
BR120ST
Quantity
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Eaton / Cutler-Hammer BR120ST - 20A 1 Pole Miniature Circuit Breaker
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Description
Remote tripping capabilities define this 20-amp thermal-magnetic unit, thanks to its factory-installed shunt trip accessory. It requires two one-inch spaces to mount into Eaton Type BR load centers. The integrated shunt trip mechanism allows facility managers or automated systems to open the circuit from a distant location. It maintains standard 10kAIC fault protection and carries an HACR rating for HVAC equipment loads.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | BR120ST |
| Series | BR |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BR |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Eaton Type BR Load Centers |
| Wire Gauge | 14-4 AWG (Al/Cu) |
| Max Wire | 4 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Lock-Off |
|---|---|
| Accessories | Shunt Trip |
| Standards | Federal Specifications Classification W-C375, UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Rejection Tab |
Product FAQs
7 answersHow does the integrated shunt trip function on the BR120ST?
The factory-installed shunt trip mechanism allows for remote electrical tripping of the circuit breaker. When a 120V AC control voltage signal is applied to the shunt trip coil, typically from an emergency stop push button or fire alarm panel, it mechanically forces the breaker to open and disconnect power.
Is the BR120ST required for standard 20A household circuits?
No. The BR120ST includes a shunt trip mechanism for remote shutdown, which is usually mandated for specific applications like commercial kitchen hoods, fire alarm interfaces, or emergency stops. For standard 120V, 20A branch circuits without a remote trip requirement, a standard Eaton BR120 breaker is the correct and more economical choice.
What load centers are cross-compatible with the Eaton BR120ST?
This 1-inch plug-on breaker is designed specifically for Eaton Type BR load centers. Due to historical brand acquisitions, it is also backward compatible with legacy Cutler-Hammer, Bryant, and Westinghouse load centers that accept 1-inch Type BR breakers.
Can I substitute an Eaton Type CH breaker in place of this Type BR breaker?
No. Eaton Type BR breakers are 1-inch wide per pole and use a standard plug-on configuration, whereas Type CH breakers are 3/4-inch wide per pole and use a different mounting style with a distinctive tan handle. They are not interchangeable.
Is the BR120ST suitable for 240V equipment loads?
No. Because this is a 1-pole breaker, it only provides 120V to the load. Dedicated 240V equipment without a neutral requires a 2-pole circuit breaker. The "120/240V" rating indicates it is rated for use on one leg of a standard 120/240V single-phase electrical system.
What wire types and sizes can be landed on this breaker's terminals?
The box lug terminals on this breaker accept 14 AWG through 4 AWG conductors. They are rated for both copper (Cu) and aluminum (Al) wire, providing flexibility for various residential and light-commercial wiring applications.
What is the Cutler-Hammer or Bryant equivalent to this Eaton breaker?
Because Eaton acquired the Cutler-Hammer and Bryant brands, the Eaton BR120ST serves as the direct, exact replacement for older Cutler-Hammer, Westinghouse, or Bryant breakers bearing the exact same BR120ST catalog number.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 70 reviews.
Reviews Summary
Generated by AI from 96 most recent customer reviews
Last updated 8/15/25
Customers say these circuit breakers arrive quickly and fit their needs perfectly. Many reviews mention competitive pricing and reliable availability, particularly for hard-to-find models. The products consistently meet expectations for installation and functionality. Reviews frequently note the precise fit and immediate operation of these breakers. Some users appreciate the option of both new and refurbished units.
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Rating
70 reviews
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In this day and age it can be a challenge at times finding a reputable business that fills your order correctly and at the right price and without delay. I am very pleased with your service. Thank you.