Siemens HGB1B045B Molded Case Circuit Breaker
- 45A
- 1 Pole
- Bolt-On
Siemens
HGB1B045B
Molded Case Circuit Breaker
Brand
Siemens
SKU
HGB1B045B
Quantity
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Siemens HGB1B045B - 45A 1 Pole Molded Case Circuit Breaker
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Description
Designed for heavy-duty commercial applications, this 45-amp single-pole MCCB provides dependable thermal-magnetic protection. It is part of the Siemens SENTRON family, offering fixed long-time and instantaneous trip functions. This bolt-on breaker is engineered for compatibility with Siemens P1, P2, and P3 panelboards. For future upgrades, it is replaced by the 3VA4145-5ED14-0AA0 model using an xGB/3VA strap kit. The unit boasts a 65kAIC rating at 120VAC and is fully HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Series | HGB |
| Amperage | 45A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC, 347VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 120VAC, 35kA @ 277VAC, 42kA @ 125VDC, 14kA @ 347VAC |
| Frame Type | HGB |
|---|---|
| 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, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, High Interrupting Capacity |
Product FAQs
8 answersWhich panelboards accept the Siemens HGB1B045B circuit breaker?
This bolt-on breaker is designed for use in Siemens P1, P2, and P3 commercial panelboards. It mounts directly to the panel bus using bolted connections.
What are the acceptable wire sizes for the HGB1B045B terminals?
The factory-installed lugs accept 8 to 1/0 AWG copper wire or 8 to 2/0 AWG aluminum wire. Ensure proper torque specifications are followed during installation as outlined on the breaker label.
Is the HGB1B045B compatible with aluminum wiring?
Yes, the factory-installed lugs are dual-rated for both copper and aluminum conductors. When using aluminum wire, the accepted gauge range is 8 AWG to 2/0 AWG. Ensure an appropriate oxide-inhibiting compound is used per standard electrical practices.
Is the HGB1B045B rated for direct current (DC) applications?
Yes, this breaker carries a DC rating of 125VDC with an interrupting capacity of 42kA, making it suitable for specific control circuits and DC power systems.
What is the difference between Siemens NGB, HGB, and LGB circuit breakers?
These prefixes indicate the interrupting rating of the GB frame. The HGB is the high-interrupting version, rated at 35kAIC at 277V. In comparison, the standard NGB is rated at 25kAIC, and the LGB is rated at 65kAIC at 277V.
Is there a direct replacement for the legacy HGB1B045B circuit breaker?
Yes, as the legacy SENTRON GB frame is phased out, Siemens recommends the 3VA41 series as a replacement. Specifically, the 3VA4145-5ED14-0AA0 is the suggested successor, though it may require a mounting adapter kit for installation in existing panelboards.
Can the HGB1B045B be mounted on a standard DIN rail?
No, the HGB1B045B is a bolt-on circuit breaker designed specifically for panelboard mounting in Siemens P1, P2, and P3 panels. For DIN rail applications, a different frame type, such as the GG series, is required.
What protection does the LI trip function provide on this breaker?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The long-time function protects against sustained overloads, while the instantaneous function trips the breaker immediately during a short circuit.
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