Siemens NGB3K100B Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Siemens
NGB3K100B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB3K100B
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Siemens NGB3K100B - 100A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial distribution, the Siemens NGB3K100B is a 3-pole, 100A molded case circuit breaker. It features a bolt-on mounting style and delivers reliable thermal-magnetic overcurrent protection. This breaker installs into Siemens P1, P2, and P3 panelboards and includes load-side lugs for immediate wiring. With an interrupting capacity of 25kAIC at 480Y/277VAC, this HACR-rated unit is fully suitable for reverse feed applications.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 100A |
| 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 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 |
|---|---|
| Accessories | Load Side Lugs Included (3TC1GG20) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
7 answersWhich panelboards are compatible with the NGB3K100B circuit breaker?
This bolt-on breaker is designed for use in Siemens P1, P2, and P3 panelboards. It mounts directly to the panel bus using bolted connections.
What wire sizes and materials are accepted by the lugs on the NGB3K100B?
The factory-installed load lugs accept 8 AWG to 1/0 AWG copper wire, or 8 AWG to 2/0 AWG aluminum wire. Ensure proper torque specifications are followed during installation as outlined on the breaker label.
Can the NGB3K100B be used in DC applications?
Yes, this breaker is rated for DC applications up to 125/250VDC with a maximum interrupting capacity of 14kA.
Is the trip unit on the NGB3K100B adjustable?
No, this breaker features a fixed thermal and fixed magnetic trip unit. Neither the long-time nor the instantaneous trip functions can be adjusted in the field.
What is the difference between the NGB3K100B and the HGB or LGB versions?
The NGB3K100B is the standard interrupting capacity version, rated at 25kAIC at 480VAC. The HGB and LGB versions offer higher interrupting ratings, 35kAIC and 65kAIC respectively, for applications with higher available fault currents.
Does the NGB3K100B include line and load side lugs?
As a panelboard-mounted breaker, it connects directly to the panel bus on the line side. It includes factory-installed lugs on the load side only.
Is the NGB3K100B a direct replacement for the NGB3B100B?
Yes, the NGB3K100B is the current Siemens catalog number that replaces the older NGB3B100B. Both are 100A, 3-pole, NGB frame breakers designed for the same panelboard applications.
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Reviews
Review summary
Customers rate this product 4.5 out of 5 based on 8 reviews.
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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