Siemens HGB3B125B Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
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Siemens HGB3B125B - 125A 3 Pole Molded Case Circuit Breaker
New
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Description
A robust solution for heavy-duty power distribution, the Siemens HGB3B125B is a 3-pole, 125A bolt-on molded case circuit breaker. It provides an impressive 100kAIC at 240V and 35kAIC at 480Y/277V, making it ideal for high-fault commercial systems. This GB frame breaker installs into Siemens P1 through P5 panelboards and is HACR rated. As this model transitions out, it is replaced by the 3VA5112-5EC31-0AA0, which necessitates a specific mounting kit for panelboard integration.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HGB3B125B |
| Series | HGB |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 35kA @ 480Y/277VAC, 18kA @ 600Y/347VAC |
| Frame Type | HGB |
|---|---|
| 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 |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, High Interrupting Capacity |
Product FAQs
5 answersWhich Siemens panelboards are compatible with the HGB3B125B circuit breaker?
This GB-frame breaker is designed for bolt-on installation in Siemens P1, P2, P3, P4, and P5 panelboards.
What is the difference between Siemens NGB and HGB circuit breakers?
The primary difference is the short-circuit interrupting rating. The HGB series offers a higher interrupting capacity than the standard NGB series, making it suitable for commercial and industrial systems with higher available fault currents.
Is there a newer replacement for the HGB3B125B?
Yes, as the GB-frame transitions out of production, Siemens replaces it with the newer 3VA series (specifically model 3VA5112-5EC31-0AA0). Note that installing the 3VA replacement into existing P1 through P5 panelboards requires a specific mounting kit.
Can the HGB3B125B be reverse fed?
Yes, this breaker is suitable for reverse feed applications. Because it does not have restricted Line and Load terminal markings, it can be backfed in accordance with UL 489 standards.
Is the Siemens HGB3B125B HACR rated?
Yes, this molded case circuit breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment.
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