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Eaton/Cutler-Hammer GHB3040S1 3 Pole Circuit Breaker
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Eaton / Cutler-Hammer GHB3040S1 Molded Case Circuit Breaker

  • 40A
  • 3 Pole
  • Bolt-On
Eaton / Cutler-Hammer GHB3040S1
Molded Case Circuit Breaker
Brand Eaton / Cutler-Hammer
SKU GHB3040S1
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  • 40A
  • 3 Pole
  • Bolt-On

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Eaton/Cutler-Hammer GHB3040S1 3 Pole Circuit Breaker

Eaton / Cutler-Hammer GHB3040S1 - 40A 3 Pole Molded Case Circuit Breaker

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$1,795.00 In Stock

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Description SpecificationsProduct FAQs SuperClub Warranties Shipping Reviews 4.8 (30)

Description

Built for advanced control, the GHB3040S1 is a 3-pole, 40A molded case circuit breaker featuring a factory-installed 120VAC shunt trip. This allows facility managers to remotely open the circuit for emergency shutdowns or automated processes. This Series C G-frame breaker installs into Eaton Pow-R-Line C panelboards, switchboards, and legacy Westinghouse PRL2 panels. The bolt-on connection provides a secure fit for commercial power systems.

Specifications

Key specifications
Brand Eaton / Cutler-Hammer
Part Number GHB3040S1
Series GHB
Amperage 40A
Poles 3
Mounting Style Bolt-On
Voltage 240VAC, 480Y/277VAC, 125/250VDC
Phase 3
AIC Rating 65kA @ 240VAC, 14kA @ 480Y/277VAC, 14kA @ 125/250VDC
Fit and installation
Terminal Type Lugs
For Use With Eaton Pow-R-Line C Panelboards, Series C Panelboards, Westinghouse PRL2 Panelboards
Wire Gauge #10-1/0 AWG (Cu/Al)
Max Wire 1/0 AWG
Min Wire 10 AWG
Protection and operation
Trip Technology Thermal Magnetic
Trip Function Code LI
Trip Function Long-Time, Instantaneous
Trip Adjustability Fixed Thermal, Fixed Magnetic
Standards and features
Available Options Auxiliary Switch, Undervoltage Release, Alarm Switch
Accessories Shunt Trip (120VAC)
Standards CSA C22.2 No. 5, Federal Specification W-C-375B, UL 489
Approval CSA, UL
Temp Rating 40C
Construction Features HACR Rated, Reverse Feed, Non-Interchangeable Trip

Product FAQs

7 answers
Which panelboards accept the GHB3040S1 circuit breaker?

This bolt-on G-frame breaker is compatible with Eaton Pow-R-Line C panelboards, Series C panelboards, and legacy Westinghouse PRL2 panelboards.

What does the S1 suffix mean on the GHB3040S1?

The S1 suffix indicates that the breaker is equipped with a factory-installed 120VAC shunt trip. This allows the breaker to be opened remotely for emergency shutdowns or automated control.

Can the GHB3040S1 replace older Westinghouse breakers?

Yes, Eaton acquired the Westinghouse circuit breaker division. The GHB3040S1 is a direct replacement for legacy Westinghouse GHB breakers with the same catalog number and shunt trip requirements.

Can the GHB3040S1 be reverse fed?

Yes, this thermal magnetic breaker is suitable for reverse feed applications, allowing it to be used as a main breaker or in back-fed setups where permitted by local codes.

What wire sizes are supported by the terminals on the GHB3040S1?

The standard lugs accept 10 AWG to 1/0 AWG wire and are rated for both copper and aluminum conductors.

Can the GHB3040S1 be used in DC power systems?

Yes, this breaker is rated for use in direct current applications up to 125/250VDC, providing a 14kA interrupting capacity for DC circuits.

Are the thermal and magnetic trip settings adjustable on this breaker?

No, the GHB3040S1 features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous (LI) protection functions are factory set and cannot be field adjusted.

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Reviews

4.8
Rated 4.8 out of 5 stars
Based on 30 reviews
Reviews Summary
Customers say these breakers function reliably and arrive quickly with proper packaging. The ordering process is straightforward, and products consistently match descriptions. Many reviews highlight fast shipping, competitive pricing, and availability. Users appreciate the condition of refurbished units and easy online ordering. One customer reported receiving an incorrect amperage breaker despite paying for expedited delivery. Another noted disappointment when duplicate orders were not consolidated to reduce freight costs. Overall, customers value the quick procurement and dependable product quality.
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30 reviews
  • TG
    Timothy G.
    Verified Buyer
    Reviewing
    Eaton / Cutler-Hammer GHB3020 - 20A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    9/17/26
    Used model

    Breaker ohm tested out fine and currently working on load test with a longer term battery charger. So far so good. Packaged very well no visible damages during shipping. Even received a follow up call from customer that I missed.

    Was this helpful?
  • CK
    Christopher K.
    Verified Buyer
    Reviewing
    Eaton / Cutler-Hammer GHB3030 - 30A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    9/16/26
    Great and easy support

    Easy ordering process, and always helpful over support

    Was this helpful?
  • DM
    Dustin M.
    Verified Buyer
    Reviewing
    Eaton / Cutler-Hammer GHB3030 - 30A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    8/31/26
    Great Price and Worked as Expected

    Bought the renewed breaker and all works as expected and saved us money. Great price and availability. Thank you.

    Was this helpful?
  • MW
    MARK W.
    Verified Buyer
    Reviewing
    Eaton / Cutler-Hammer GHB1020 - 20A 1 Pole Molded Case Circuit Breaker
    Rated 3 out of 5 stars
    7/21/26
    Good Product, but Disappointed With the Service

    Good product, but I was disappointed with the service. I accidentally placed two separate orders and ended up paying freight on both. I had requested that they combine the orders, and had that been done with the freight waived, it would have saved me money.

    Other than that, everything was good. I’m just disappointed that no one communicated this to me.

    Was this helpful?
  • AW
    Anthony W.
    Verified Buyer
    Reviewing
    Eaton / Cutler-Hammer GHB3080 - 80A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    4/7/26
    Breaker

    Item came quick and as described. Simple and easy process!

    Was this helpful?