Siemens NGB3K090B Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Siemens
NGB3K090B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB3K090B
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Siemens NGB3K090B - 90A 3 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
100A 3 Pole Molded Case Circuit Breaker
100A 3 Pole Molded Case Circuit Breaker
80A 3 Pole Molded Case Circuit Breaker
Description
Built for demanding environments, the Siemens NGB3K090B functions as a 3-pole, 90A molded case circuit breaker. It utilizes proven thermal-magnetic trip technology to deliver dependable long-time and instantaneous protection against faults. This unit mounts into Siemens P1 through P5 panelboards and crosses over to the 3VA5190-4ED36-0AA0 frame with a panel mounting kit. Featuring a trip-free mechanism, it boasts a 100kAIC rating at 240VAC and comes with load lugs included.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 90A |
| 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 |
| Frame Type | NGB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 8-1/0 AWG (Cu), 8-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Trip-Free Mechanism |
Product FAQs
7 answersWhich panelboards are compatible with the NGB3K090B circuit breaker?
The NGB3K090B is a bolt-on branch breaker designed specifically for use in Siemens Sentron series P1, P2, P3, P4, and P5 panelboards. It is not compatible with standard residential load centers.
What wire sizes and materials are accepted by the lugs on the NGB3K090B?
The factory-installed lugs accept 8 AWG to 1/0 AWG copper wire, or 8 AWG to 2/0 AWG aluminum wire. Ensure you apply the correct torque specifications listed on the breaker faceplate during installation.
Can the NGB3K090B be used in direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is certified for DC applications up to 125/250VDC with an interrupting capacity of 14kAIC, making it suitable for specific industrial control or battery systems.
Are the trip settings on the NGB3K090B adjustable?
No, this breaker features a fixed thermal and fixed magnetic trip unit. It provides standard long-time and instantaneous (LI) protection but does not allow for field adjustments to the trip curve.
Does the NGB3K090B require a mounting hardware kit?
As a bolt-on breaker, it mounts directly to the bus of compatible Siemens panelboards. Depending on your specific panelboard chassis, you may need a separate branch breaker mounting kit or strap kit if the panel does not already have the required hardware installed.
What is the difference between the Siemens NGB3K090B and NGB3B090B?
The NGB3K090B includes factory-installed load lugs, whereas the NGB3B090B is the base breaker without lugs. Both share the same 90A, 3-pole NGB frame and electrical ratings.
Is the NGB3K090B suitable for heating, air conditioning, and refrigeration equipment?
Yes, this breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires a 90A, 3-pole disconnect.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
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.
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
Review summary
Customers rate this product 4.5 out of 5 based on 8 reviews.
Search
Rating
8 reviews
- JHJohn H.Verified BuyerReviewingSiemens NGB3B015B - 15A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/16/26480v breakers
The breakers work great
- BPBland P.Verified BuyerReviewingSiemens NGB3B100 - 100A 3 Pole Molded Case Circuit BreakerI do not recommend this productRated 1 out of 5 stars7/22/26NO 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.
- PFPaul F.Verified BuyerReviewingSiemens NGB3B060B - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/24/26Great service, quick shippin
Need I say more.I have used SB. When we need it and need it quickly Always have what I need.
- BPBJ P.Verified BuyerReviewingSiemens NGB3B020B - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/11/26NGB3B020B
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.
- RSRadovan S.Verified BuyerReviewingSiemens NGB3B050B - 50A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/9/26Absolutely amazing service.
On Time