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Eaton / Cutler-Hammer BR280ST Miniature Circuit Breaker
- 80A
- 2 Pole
- Plug-On
Eaton / Cutler-Hammer
BR280ST
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
BR280ST
Quantity
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Eaton / Cutler-Hammer BR280ST - 80A 2 Pole Miniature Circuit Breaker
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Description
Engineered for commercial and industrial applications, this 80A two-pole component features a factory-installed shunt trip mechanism. The integrated accessory allows for remote tripping of the circuit, essential for emergency shutdowns or automated control systems. It installs into standard Eaton Type BR load centers and legacy Cutler-Hammer enclosures. Because of the attached shunt trip module, the unit requires three one-inch panel spaces. Rated for 10kA interrupting capacity at 120/240VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | BR280ST |
| Series | BR |
| Amperage | 80A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BR |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Type BR Load Centers |
| Wire Gauge | 8-1/0 AWG (Al/Cu) |
| Max Wire | 1/0 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed) |
| Standards | Federal Specification W-C-375, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 60C, 75C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
7 answersWhat does the "ST" suffix indicate on the BR280ST?
The "ST" suffix indicates that this breaker includes a factory-installed shunt trip mechanism. This allows the breaker to be tripped remotely by applying a voltage signal.
How many panel spaces does the BR280ST require?
This breaker requires three 1-inch spaces in a Type BR load center. The 2-pole breaker occupies two spaces, and the factory-installed shunt trip requires an additional 1-inch space.
What voltage is required to activate the shunt trip on the BR280ST?
The shunt trip requires a 120VAC momentary voltage signal to activate. A continuous signal should be avoided to prevent burning out the shunt coil.
Can I field-install a shunt trip on a standard BR280 breaker?
No, shunt trips cannot be field-installed on Eaton Type BR miniature circuit breakers. You must purchase a breaker with a factory-installed shunt trip, such as the BR280ST.
What is the primary application for the shunt trip feature on this breaker?
The shunt trip allows the breaker to be opened remotely via an external electrical signal. It is typically used for emergency stop buttons, fire alarm system integration, or remote equipment shutdowns.
Is the BR280ST backward compatible with older panels?
Yes, Eaton Type BR breakers are UL approved for use in Westinghouse, Challenger, Bryant, and Cutler-Hammer load centers that accept Type BR breakers.
Can the BR280ST be used in a system with a 22kAIC fault current?
No, this breaker has a maximum interrupting rating of 10kAIC at 120/240VAC. It must not be installed in systems where the available fault current exceeds 10,000 amps.
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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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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.