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Siemens HGB3B070B Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Siemens
HGB3B070B
Molded Case Circuit Breaker
Brand
Siemens
SKU
HGB3B070B
Quantity
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Siemens HGB3B070B - 70A 3 Pole Molded Case Circuit Breaker
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Description
Providing robust commercial power protection, the Siemens HGB3B070B is a 3-pole, 70A molded case circuit breaker from the SENTRON family. It offers fixed thermal and magnetic trip functions to safeguard against overloads and short circuits. The GB-frame device features a bolt-on design, allowing it to mount into Siemens P1 through P5 panelboards. Rated for 35kA at 480V, this breaker is HACR rated, suitable for reverse feed installations, and includes load side lugs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HGB3B070B |
| Series | HGB |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 35kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 42kA @ 125/250VDC |
| 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 (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, Undervoltage Release |
|---|---|
| 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 answersWhat panelboards are compatible with the Siemens HGB3B070B?
This bolt-on branch circuit breaker is designed specifically for installation in Siemens P1, P2, P3, P4, and P5 panelboards.
What is the difference between Siemens NGB, HGB, and LGB circuit breakers?
The prefix indicates the interrupting capacity of the breaker. NGB is standard interrupting, HGB is high interrupting (35kAIC at 480Y/277VAC), and LGB is extra-high interrupting. All three share the same physical GB frame footprint and panelboard compatibility.
What wire sizes and materials are accepted by the lugs on this breaker?
The factory-installed load lugs accept 8 to 1/0 AWG copper (Cu) wire or 8 to 2/0 AWG aluminum (Al) wire.
Can the HGB3B070B be used in DC voltage applications?
Yes, this breaker is rated for 125/250VDC applications with a direct current interrupting rating of 42kAIC.
Are the thermal and magnetic trip settings adjustable on this breaker?
No, the HGB3B070B features a fixed thermal and fixed magnetic trip unit. The trip curve settings cannot be adjusted in the field.
How does the HGB frame mount into the electrical panel?
The HGB3B070B is a bolt-on circuit breaker. It secures directly to the panelboard bus using bolted connections rather than snapping or plugging in, ensuring a secure connection for commercial and industrial applications.
Can I use a different brand of breaker instead of the Siemens HGB3B070B?
No. Siemens P-series panelboards require Siemens-listed breakers like the HGB3B070B to maintain UL safety listings and manufacturer warranties. Mixing brands can lead to improper fit, high-resistance connections, and electrical hazards.
What does the LI trip function code mean for this breaker?
The LI designation stands for Long-Time and Instantaneous trip functions. The long-time function protects against sustained overloads, while the instantaneous function trips the breaker immediately during a short circuit.
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