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Eaton / Cutler-Hammer BR3100ST Miniature Circuit Breaker
- 100A
- 3 Pole
- Plug-On
Eaton / Cutler-Hammer
BR3100ST
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
BR3100ST
Quantity
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Eaton / Cutler-Hammer BR3100ST - 100A 3 Pole Miniature Circuit Breaker
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Description
Engineered for residential and commercial applications, the Eaton BR3100ST delivers 100A of thermal-magnetic protection. This three-pole breaker features a factory-installed shunt trip mechanism, allowing for remote tripping capabilities when integrated with safety systems. Because of the added shunt trip, this unit requires four 1-inch pole spaces for installation. It snaps seamlessly into Eaton Type BR, Bryant, Challenger, and Westinghouse load centers. Rated for 10kAIC at 240VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | BR3100ST |
| Series | BR |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | BR |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Eaton Type BR Load Centers, Bryant Load Centers, Challenger Load Centers, Westinghouse Load Centers |
| Wire Gauge | 1 AWG (Cu/Al) |
| Max Wire | 1 AWG |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Lock |
|---|---|
| Accessories | Shunt Trip |
| Standards | Federal Specification W-C375, UL 489 |
| Approval | UL |
| Temp Rating | 60C to 75C |
| Construction Features | HACR Rated, Common Trip, Requires 4 Pole Spaces |
Product FAQs
7 answersWhich load centers are compatible with the BR3100ST circuit breaker?
This plug-on breaker is designed for use in Eaton Type BR load centers. It is also backward compatible with legacy Bryant, Challenger, and Westinghouse load centers that accept Type BR breakers.
How many panel spaces does the BR3100ST require for installation?
Because of the factory-installed shunt trip mechanism, this three-pole breaker requires four 1-inch pole spaces in your load center.
What voltage is required to activate the shunt trip on the BR3100ST?
The shunt trip requires a 120VAC momentary signal to activate, allowing for remote tripping in emergency situations. Ensure the control signal is momentary to prevent damage to the shunt coil.
Can a shunt trip be field-installed on a standard 3-pole BR breaker?
No, shunt trips cannot be field-installed on Eaton BR series breakers. You must install a breaker with a factory-installed shunt trip, such as the BR3100ST.
What is the primary safety application for the shunt trip feature?
The shunt trip allows the breaker to be tripped remotely by an external electrical signal. This is commonly used to integrate the circuit with emergency shutdown systems, fire alarms, or equipment safety interlocks.
How does the thermal-magnetic trip unit function on this breaker?
The fixed thermal-magnetic trip unit provides dual protection: a long-time thermal response for sustained overloads and an instantaneous magnetic response for short circuits.
Is the Eaton BR3100ST the same as the Cutler-Hammer BR3100ST?
Yes. Eaton acquired Cutler-Hammer, and the BR series breakers are identical and fully interchangeable under both brand names.
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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.