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Siemens NGB3B100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Siemens
NGB3B100
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB3B100
Quantity
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Siemens NGB3B100 - 100A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial distribution, the Siemens NGB3B100 is a 3-pole, 100A molded case circuit breaker. This model is supplied without load lugs, allowing for customized terminal configurations. The bolt-on MCCB installs into Siemens P1 through P5 panelboards. While replaced by the 3VA5110-4EC36-0AA0 for new builds, this NGB frame unit remains critical for existing systems. It provides 100kAIC at 240VAC and 25kAIC at 480Y/277VAC. The breaker is HACR rated and UL listed for safety.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, P4, P5 Panelboards |
| 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, Lug Kits |
|---|---|
| Accessories | Lugs not included |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
5 answersWhich panelboards are compatible with the Siemens NGB3B100?
This circuit breaker is built for direct integration into Siemens P1, P2, P3, P4, and P5 panelboards. It uses a bolt-on connection to secure directly to the panelboard busbars, ensuring a firm mechanical and electrical joint.
What does a bolt-on connection mean for installing this breaker?
Unlike plug-in breakers that simply snap into place, this unit requires bolting its line-side connections directly to the panelboard bus. This method is standard for commercial Siemens P-series panelboards and provides a highly secure, vibration-resistant connection.
What type of fault protection does the NGB3B100 provide?
Equipped with a fixed thermal-magnetic trip unit, this breaker offers dual-level protection (LI). The thermal element responds to prolonged overloads (long-time), while the magnetic element trips instantly during severe short circuits (instantaneous) to prevent equipment and wiring damage.
Is the NGB3B100 rated for direct current (DC) systems?
Yes. While commonly installed in commercial AC panelboards up to 600Y/347V, it is also approved for DC networks up to 125/250VDC. It provides a 14kA interrupting capacity in these DC applications.
Can the NGB3B100 be used to replace older Siemens GB frame breakers?
Yes, because it utilizes the standard GB/GG frame profile, it serves as a direct bolt-on replacement for older equivalent Siemens GB-frame breakers in existing commercial panelboards.
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