Siemens NGB3K025B Molded Case Circuit Breaker
- 25A
- 3 Pole
- Bolt-On
Siemens
NGB3K025B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB3K025B
Quantity
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Siemens NGB3K025B - 25A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty applications, the Siemens NGB3K025B is a 25A, 3-phase molded case circuit breaker. It utilizes a proven thermal-magnetic trip mechanism to provide essential long-time and instantaneous circuit defense. Designed for secure bolt-on mounting, this unit fits seamlessly into Siemens P1 through P5 panelboards. With an interrupting capacity of 100kA at 240V and 25kA at 480Y/277V, it ensures high-level safety. The breaker is HACR and HID lighting rated for versatile commercial use.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 25A |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| 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 (TC1Q1) |
| 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 |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the NGB3K025B?
This bolt-on breaker is designed specifically for installation in Siemens Sentron P1, P2, P3, P4, and P5 panelboards.
What wire sizes are accepted by the terminals on this breaker?
The factory-installed lugs accommodate 14 to 6 AWG copper conductors or 12 to 6 AWG aluminum conductors. Always verify the required torque settings in the manufacturer documentation before terminating the wires.
How does the LI trip function operate on the NGB3K025B?
The LI code stands for Long-Time and Instantaneous trip functions. The thermal element provides long-time protection against gradual overloads, while the magnetic element delivers instantaneous protection against severe short circuits. Both parameters are fixed on this 25A model.
Is this breaker suitable for direct current (DC) systems?
Yes, in addition to its alternating current ratings, this model is rated for use in 125/250VDC systems with a maximum interrupting capacity of 14kA.
What is the advantage of the bolt-on mounting style used by this breaker?
Bolt-on breakers like the NGB3K025B fasten directly to the panelboard bus with screws. This creates a rigid, secure mechanical and electrical connection that is highly resistant to vibrations and thermal cycling.
What frame class does the NGB3K025B belong to?
This unit is part of the Siemens Sentron family and utilizes the NGB frame, which is categorized under the broader GB and GG frame groups.
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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