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Eaton / Cutler-Hammer BR320ST Miniature Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Eaton / Cutler-Hammer
BR320ST
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
BR320ST
Quantity
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Eaton / Cutler-Hammer BR320ST - 20A 3 Pole Miniature Circuit Breaker
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Description
Engineered for commercial applications, the Eaton BR320ST provides 20-amp overcurrent protection with remote disconnect capabilities. This three-pole unit is essential for facilities requiring emergency power shutoffs. It mounts into Eaton and Cutler-Hammer Type BR load centers. Due to the side-mounted accessory, this model requires four pole spaces within the panelboard. Rated for 10 kAIC at 240V, it features a factory-installed shunt trip and reliable thermal-magnetic trip technology.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | BR320ST |
| Series | BR |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | BR |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Type BR Load Centers |
| Wire Gauge | 14-4 AWG (Cu/Al) |
| Max Wire | 4 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | Federal Specification W-C375, UL 489 |
| Approval | UL |
| Temp Rating | 60C to 75C |
| Construction Features | Common Trip |
Product FAQs
7 answersWhat panels are compatible with the BR320ST circuit breaker?
This breaker is designed for use in Eaton, Cutler-Hammer, Bryant, Westinghouse, and Challenger Type BR load centers. Always verify compatibility with your specific panel label.
How many panel spaces does the BR320ST require?
Although it is a 3-pole breaker, the factory-installed shunt trip accessory requires one additional 1-inch space. It occupies a total of four 1-inch pole spaces in the load center.
What is the purpose of the ST suffix on this breaker?
The ST suffix indicates that the breaker includes a factory-installed shunt trip. This allows the breaker to be tripped remotely for emergency power shutoffs or control circuit operations.
Can I field-install a shunt trip on a standard BR320 breaker?
No, shunt trips cannot be field-installed on Eaton BR series circuit breakers. You must purchase a breaker with a factory-installed shunt trip, such as the BR320ST.
What voltage is required to activate the shunt trip coil?
The shunt trip coil requires a 120VAC momentary signal to activate. A continuous signal should be avoided to prevent burning out the shunt coil.
What is the recommended tightening torque for the box lugs?
The box lug terminals on this breaker should be tightened to 25 lb-in.
Can this breaker replace older Cutler-Hammer or Bryant models?
Yes, Eaton Type BR breakers are the direct, UL-listed replacements for legacy Cutler-Hammer, Bryant, Westinghouse, and Challenger Type BR load centers.
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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.