Skip to main content
Expedited shipping available at checkout

Siemens NGB3K030B Molded Case Circuit Breaker

  • 30A
  • 3 Pole
  • Bolt-On
Siemens NGB3K030B
Molded Case Circuit Breaker
Brand Siemens
SKU NGB3K030B
Select Item Condition
Earn 827 SuperPoints
  • 30A
  • 3 Pole
  • Bolt-On

Quantity

Bulk Pricing
Send your parts list for a volume quote.

Siemens NGB3K030B - 30A 3 Pole Molded Case Circuit Breaker

New

$827.62 In Stock

Quantity

Similar Items

Description

Providing reliable power distribution, the Siemens NGB3K030B is a 30A, 3-pole molded case circuit breaker. It features fixed thermal and magnetic elements to safeguard commercial systems against overloads and short circuits. This Sentron GB-frame breaker mounts into Siemens P1 through P5 panelboards. It can be substituted by the newer 3VA5130-4ED36-0AA0 model when paired with the required mounting kit. The unit boasts a 100kAIC rating at 240V and is HACR and HID rated for versatile applications.

Specifications

Key specifications
Brand Siemens
Series NGB
Amperage 30A
Poles 3
Mounting Style Bolt-On
Voltage 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC
Phase 3
AIC Rating 100kA @ 240VAC, 25kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC
Fit and installation
Frame Type NGB
Terminal Type Lugs
For Use With Siemens P1, P2, P3, P4, P5 Panelboards
Wire Gauge 14-6 AWG (Cu), 12-6 AWG (Al)
Max Wire 6 AWG
Min Wire 14 AWG (Cu), 12 AWG (Al)
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 Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment
Accessories Load Lugs
Standards CSA C22.2 No. 5, UL 489, NEMA AB 1
Approval CSA, HACR, HID, UL
Temp Rating 40C
Construction Features HACR Rated, Reverse Feed, Trip-Free Mechanism

Product FAQs

6 answers
Which Siemens panelboards are compatible with the NGB3K030B circuit breaker?

This bolt-on breaker is designed for use in Siemens Sentron P1, P2, P3, P4, and P5 series panelboards.

What wire sizes and materials are accepted by the NGB3K030B terminals?

The factory-installed lugs accept 14 to 6 AWG copper wire or 12 to 6 AWG aluminum wire.

Can the NGB3K030B be used in DC voltage applications?

Yes, this breaker is rated for 125/250VDC systems with a maximum interrupting capacity of 14kAIC.

Is the trip unit on the NGB3K030B adjustable?

No, it features a fixed thermal and fixed magnetic trip unit providing standard long-time and instantaneous protection.

What is the modern replacement for the Siemens NGB3K030B?

The NGB3K030B can be substituted by the newer Siemens 3VA5130-4ED36-0AA0 model when paired with the required mounting kit.

Does the NGB3K030B replace older Siemens GB frame breakers?

Yes, the NGB frame is part of the modern Siemens Sentron line and is often used to replace older GB or GG frame breakers in compatible panelboards.

SuperClub

Join free. Get 500 SuperPoints.

Earn points on eligible purchases and redeem them at checkout.

100 SuperPoints = $1 off.

Warranties

60-Day Warranty

Your purchase includes 60 days of SuperBreakers warranty coverage.

Get a Quote

Don’t see what you’re looking for?

We source obsolete and hard-to-find parts every day.

Shipping

Free Shipping Policy

Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.

Read our full shipping policy

Same Day Shipping

We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.

Expedited Shipments

Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.

International Shipping

All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.

Reviews

4.5
Rated 4.5 out of 5 stars
Based on 8 reviews
Rating
Ratings
8 reviews
  • JH
    John H.
    Verified Buyer
    Reviewing
    Siemens NGB3B015B - 15A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    9/16/26
    480v breakers

    The breakers work great

  • BP
    Bland P.
    Verified Buyer
    Reviewing
    Siemens NGB3B100 - 100A 3 Pole Molded Case Circuit Breaker
    I do not recommend this product
    Rated 1 out of 5 stars
    7/22/26
    NO LUGS!!

    I ordered this breaker and it arrived with no lugs. It was advertised as new so we didn't open the box and check until the shutdown we needed it for. When we discovered the lugs were missing we sent an email requesting a set overnighted. We didn't get a response for a couple of days, at which point we had already ordered lugs from their competitor Simply Breakers. They asked for pictures and questioned weather we had ordered the correct breaker asking if we needed lugs on both sides. This is a panel breaker and their is only one configuration that I am aware of which is bolted to bus in panel and wires to the three lugs on the other side. I have never had to order lugs separately for this style of breaker. They asked for pictures of box and what was in it, of course at this point the breaker is already installed and the box is thrown away. I sent a receipt for the overnight lugs from Simply breakers and asked for whatever credit they could provide. I received crickets to date. I have never had a problem with an order in the past from super breakers, but they are to busy to even respond to my request so I will think twice before I order anything from them again. It will be my last option once all others have been exhausted. Use Simply Breakers they have better stock and service.

  • PF
    Paul F.
    Verified Buyer
    Reviewing
    Siemens NGB3B060B - 60A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    6/24/26
    Great service, quick shippin

    Need I say more.I have used SB. When we need it and need it quickly Always have what I need.

  • BP
    BJ P.
    Verified Buyer
    Reviewing
    Siemens NGB3B020B - 20A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    5/11/26
    NGB3B020B

    I recently purchased the NGB3B020B and I’m very satisfied with the quality and performance. The breaker feels solid and well-made, and installation was straightforward. It works exactly as expected and provides reliable protection for my electrical setup. Shipping was fast and the product arrived in excellent condition. I would definitely purchase from this seller again.

  • RS
    Radovan S.
    Verified Buyer
    Reviewing
    Siemens NGB3B050B - 50A 3 Pole Molded Case Circuit Breaker
    I recommend this product
    Rated 5 out of 5 stars
    3/9/26
    Absolutely amazing service.

    On Time