"Square D EGB E-Frame Miniatur...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,506.76
"Square D EGB E-Frame Miniature Circuit Breaker, 3-Pole"

"Square D EGB E-Frame Miniature Circuit Breaker, 3-Pole"

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Model: EGB34030

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,506.76
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Square D EGB E-Frame Miniature Circuit Breaker, 3-Pole, 480Y/277VAC

The Square D EGB E-Frame Miniature Circuit Breaker is a lighting panelboard circuit breaker engineered for use in Square D NF Panelboards, delivering short-circuit and overload protection for commercial and industrial distribution systems. This 3-pole, bolt-on breaker is rated 480Y/277VAC with a 65kA maximum interrupt rating, and the E-Frame family is available across a Motor FLA range from 20A to 125A to match a wide variety of lighting and HVAC circuit loads. Every breaker in the family is HACR rated and HID rated, and backed by cULus listing and TAA compliance for reliable, code-compliant performance in professional installations.

Key Features

  • Configuration: 3-Pole design requiring 3 panelboard spaces for lighting panelboard applications.
  • Voltage Rating: 480Y/277VAC operational voltage for commercial distribution circuits.
  • Interrupt Rating: 65kA maximum interrupting capacity for robust short-circuit and overload protection.
  • Motor FLA Range: Available from 20A up to 125A so you can select the exact rating your circuit requires.
  • Bolt-On Connection: Bolt-on mounting for secure, vibration-resistant installation in Square D NF Panelboards.
  • Circuit Breaker Application: HACR rated and HID rated, suited for lighting and HVAC circuit protection.
  • Visi-Trip™ Indicator: Built-in trip indication for faster troubleshooting and reduced downtime.
  • Terminal Capacity: Accepts AWG 14...AWG 6 copper or AWG 12...AWG 6 aluminium conductors with lugs aluminium connection, tightening torque 3.4 N.m (2.5-16 mm²).
  • Operating Environment: Rated for ambient air temperature up to 40°C; mercury-free construction.

Certifications & Compliance

  • cULus Listed
  • TAA Compliant
  • HACR Rated
  • Mercury Free

Technical Specifications

  • Warranty Period: 18 months
  • Product Certifications: cULus
  • Compliance: TAA
  • Number Of Spaces: 3
  • Mercury Free: Yes
  • Device Short Name: EGB
  • Sustainable Packaging: Yes
  • Motor FLA Options: 20A, 30A, 125A

Typical Applications

  • Lighting Panelboards (Square D NF Panelboards)
  • Commercial and Industrial Electrical Distribution
  • HVAC and Lighting Circuit Overload/Short-Circuit Protection
  • Renovation and New Construction Panelboard Upgrades

Why Square D?

Square D E-Frame breakers combine cULus-listed, TAA-compliant construction with mercury-free materials and sustainable, recycled-content packaging, reflecting a commitment to responsible manufacturing. The Visi-Trip™ indicator and HACR/HID-rated protection help electricians and contractors troubleshoot faster and keep lighting panelboards running reliably across the full 20A-125A Motor FLA range in demanding commercial environments.

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Manufacturer Resources

Product Specs

Product Type:
Circuit Breaker
Series:
E-Frame
Configuration:
3-Pole
Voltage Rating:
480Y/277VAC
Connection Type:
Bolt-On
Listing:
cULus
Department:
Electrical
Product Group:
Circuit Protection
Standards:
TAA
Product Subgroup:
Circuit Breakers
Product Width:
2.94 in
Product Height:
5.66 in
Product Depth:
4.05 in
Number Of Poles:
Three-pole

Square D EGB34030 – Frequently Asked Questions

1) Can I use a Square D EGB 3-pole breaker on a 480Y/277V system?
That is exactly its rating. The EGB 3-pole is rated 480Y/277VAC with a 65kA maximum interrupting rating, which suits it to commercial and industrial distribution where available fault current is high. It is not a 240V residential breaker.
2) What amp ratings does the Square D EGB 3-pole breaker come in?
Three ratings are offered on the 3-pole EGB: 20A (EGB34020), 30A (EGB34030) and 125A (EGB34125). The E-Frame family spans 20A to 125A overall, so pick the catalog number that matches your circuit rather than assuming a mid-range value is stocked under this breaker.
3) What wire size can I land on a Square D EGB breaker, and what is the lug torque?
The terminals take AWG 14 through AWG 6 copper or AWG 12 through AWG 6 aluminum, with an aluminum lug connection. Tighten to 3.4 N.m. Note the 6 AWG ceiling: for the 125A rating you will need to confirm your conductor sizing works within that terminal range before you order.
4) Does the Square D EGB breaker meet TAA requirements for a government job?
The EGB E-Frame is TAA compliant and cULus listed, which covers the two boxes most federal, military and public institution specs ask for. Country of origin is Mexico, a TAA designated country.
5) Is an ABB ST200M miniature breaker a substitute for a Square D EGB in an NF panelboard?
No. The ABB ST200M is a UL1077 C-curve miniature breaker, which is a supplementary protector rather than a branch-circuit breaker, and it is a DIN-rail style device rather than a bolt-on. The Square D EGB is a bolt-on breaker built for Square D NF lighting panelboards at 480Y/277VAC. Use the EGB where the panel requires a bolt-on branch device.
6) What is the closest bolt-on three-pole alternative to the Square D EGB E-Frame breaker?
The Eaton BAB Quicklag thermal-magnetic breaker is also a bolt-on three-pole unit, so it occupies the same role in a lighting panelboard. The difference that decides it is voltage: the Square D EGB is rated 480Y/277VAC, while the Eaton BAB-302 three-pole Quicklag is a 240V device. On a 277/480V lighting panel the EGB is the one that matches the system; on a 240V industrial panel the BAB fits.
7) Is the EGB breaker suitable for HVAC equipment and HID lighting circuits?
Yes on both counts. Every breaker in the EGB E-Frame family is HACR rated for heating, air conditioning and refrigeration equipment and HID rated for high intensity discharge lighting loads, which is why it shows up in commercial lighting panelboards feeding rooftop units and parking lot lighting.
8) What is the difference between the Square D EGB and an Eaton BAB bolt-on breaker?
Both are bolt-on thermal-magnetic panelboard breakers, but they are not interchangeable and they serve different voltage classes. The EGB is a 480Y/277VAC E-Frame breaker for Square D NF panelboards. Eaton's BAB Quicklag 3-pole we carry is a 240V thermal-magnetic bolt-on breaker, which is the wrong voltage class for a 277/480 lighting panel. Breakers are only listed for the panelboards they are designed into, so match the breaker to the panel brand and interior.
9) Is a miniature circuit breaker like the EGB the right choice, or do I need a molded case breaker?
The EGB is a miniature circuit breaker sized for lighting panelboard branch circuits, 20A to 125A, bolt-on into an NF interior. If you need a feeder or main device with higher ampacity, adjustable trip, or a rating plug, that is molded case territory: we stock options such as the ABB A2A150TT in the A2 Series and the ABB XT4 and XT5 3-pole breaker kits, plus the Eaton Series C K-Frame 400A 3-pole with an interchangeable rating plug. Branch lighting and HVAC circuits in an NF panel stay with the EGB.
10) Can I substitute an ABB ST200M miniature breaker for a Square D EGB?
No. The ST200M is a UL1077 supplementary protector style miniature circuit breaker with a C-curve, used for equipment protection on DIN rail, not a branch circuit breaker bolted into a panelboard. The EGB is a cULus listed bolt-on breaker for Square D NF lighting panelboards. Those are different applications, and the ST200M will not mount in an NF interior.
11) When should I specify a molded case breaker instead of the Square D EGB E-Frame?
The EGB E-Frame is a miniature panelboard breaker covering Motor FLA ratings from 20A to 125A in three poles. For feeder-size or higher-current duty beyond that band, a molded case frame is the right family - the ABB A2A150TT is a three-pole molded case breaker in the A2 Series, and ABB's XT4 and XT5 three-pole kits cover larger frames. Those are separate enclosed or chassis-mounted devices, not drop-ins for an NF panelboard interior.
12) Can I use a Bussmann CBC or CBF breaker in place of a Square D EGB?
No. The Bussmann CBC is a Type I automotive circuit breaker rated 14VDC and the CBF is a Type II automotive device; both are vehicle and low-voltage DC parts. The Square D EGB is a 480Y/277VAC three-pole bolt-on breaker for commercial panelboards. They share the word breaker and nothing else about the application.
13) I need an adjustable trip setting - does the Square D EGB E-Frame offer one?
The EGB E-Frame is a fixed-rating breaker: you choose the Motor FLA rating at order time from the 20A to 125A range, with 20A, 30A and 125A among the stocked three-pole ratings. If the job calls for a field-changeable setting, the Eaton Series C K-Frame mining breaker is a 400A three-pole unit supplied with an interchangeable rating plug, which is a much larger frame and a different mounting arrangement.
14) How much space does a 3-pole EGB breaker take up in the enclosure?
The breaker measures 5.66 in height, 2.94 in width and 4.05 in depth, and occupies 3 panelboard spaces. Check the depth figure against your can and cover clearance if you are retrofitting into an older enclosure.
15) How do I tell if an EGB breaker has tripped versus being switched off?
The EGB carries a Visi-Trip indicator, a built-in window that shows the breaker tripped on a fault rather than being turned off by hand. On a panel of identical 3-pole breakers it saves you cycling handles to find the faulted circuit.
16) Can the EGB breaker be installed in a hot mechanical room or rooftop panel?
It is rated for ambient air temperature up to 40 degrees C. Above that, standard breaker practice is to derate, so a rooftop or boiler room panel that routinely runs hotter needs the ambient checked against the breaker rating rather than assumed.
17) Does the Square D EGB take an undervoltage release accessory like Eaton NZM breakers do?
The EGB E-Frame is supplied as a self-contained bolt-on breaker with a Visi-Trip indicator for trip indication, and it is HACR and HID rated for lighting and HVAC circuits. Shunt and undervoltage accessories of the kind offered for Eaton's NZM molded case line - such as the NZM undervoltage release - belong to that molded case family, so if remote tripping is a requirement the molded case route is the one to spec.
18) Does the EGB breaker contain mercury, and is the packaging recyclable?
Construction is mercury free, and the breaker ships in sustainable, recycled-content packaging. That matters on LEED documented projects and for institutional buyers tracking restricted substances across a facility standard.
How fast can I get the Square D EGB34030 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D EGB34030 come with a warranty?
Absolutely. The Square D EGB34030 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D EGB34030?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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