Siemens HEG3B015B Circuit Breaker | 15A 3-Pole 600V 65kA@480V Bolt-On | VL Series MCCB
Siemens HEG3B015B Circuit Breaker | 15A 3-Pole 600V 65kA@480V Bolt-On | VL Series MCCB
Product images are representative only. Actual product may vary.
Siemens HEG3B015B — 15A 3-Pole Molded Case Circuit Breaker
The Siemens HEG3B015B is a high-interrupting capacity, thermal magnetic molded case circuit breaker (MCCB) from the Siemens VL Series. Rated at 15 Amps, 600V AC, 3-Pole, with an exceptional 65kA interrupting rating at 480V, this breaker is engineered for demanding industrial and commercial power distribution applications where standard-capacity breakers fall short.
With a bolt-on connection type and Long-Time / Instantaneous (LI) trip functions, the HEG3B015B delivers precise, reliable overcurrent protection in panelboards, switchboards, and motor control centers.
Key Specifications
| Manufacturer | Siemens |
| Part Number | HEG3B015B |
| Series | VL Series |
| Frame Type | HEG (H-Frame) |
| Ampere Rating | 15A |
| Voltage Rating | 600V AC |
| Number of Poles | 3-Pole (3P) |
| Phase | 3-Phase |
| Interrupting Rating | 65kA @ 480V |
| Interrupting Capacity | High Interrupting Capacity |
| Connection Type | Bolt-On |
| Trip Unit Type | Thermal Magnetic |
| Trip Functions | LI — Long-Time & Instantaneous |
| Reverse Feed Suitable | Yes |
| Lugs Included | No (not included) |
| UL Listed | Yes |
| Condition | New |
Why Choose the Siemens HEG3B015B?
The HEG3B015B stands out from standard-capacity circuit breakers because of its 65kA interrupting rating at 480V — a critical specification in high-fault-current environments like manufacturing facilities, data centers, industrial plants, and large commercial buildings. Where lower-rated breakers fail under extreme fault conditions, the HEG3B015B is engineered to interrupt safely and protect your system.
- High fault current protection: 65kA AIC @ 480V handles severe short-circuit conditions without failure
- Thermal magnetic trip unit: Provides both overload (thermal) and short-circuit (magnetic) protection in a single unit
- Bolt-On mounting: Ensures a secure, low-resistance connection to the bus bar — critical for reliability and NEC compliance
- Reverse feed capable: Allows flexible installation in panelboards and switchboards
- LI trip functions: Long-Time and Instantaneous trip offer precise, coordinated protection for downstream equipment
- UL Listed: Meets U.S. safety standards for commercial and industrial electrical installations
Typical Applications
- Industrial motor control centers (MCCs)
- Commercial panelboards and switchboards
- Manufacturing and process plants
- Data centers and critical infrastructure
- HVAC and mechanical equipment protection
- Branch circuit protection in high-fault-current environments
Frequently Asked Questions
What does 65kA @ 480V mean?
It means this circuit breaker can safely interrupt a fault current of up to 65,000 amperes at 480 volts — one of the highest ratings available for a 15A breaker, making it suitable for installations close to large utility or transformer sources.
What is the difference between HEG and HGB/NGG Siemens breakers?
The HEG frame offers a higher interrupting capacity (65kA @ 480V) compared to the NGG (25kA @ 480V) and HGB (35kA @ 480V) frames. Choose the HEG when your system's available fault current exceeds what lower-rated frames can handle.
Is the HEG3B015B suitable for reverse feed?
Yes. The HEG3B015B is approved for reverse feed applications, giving installers greater flexibility in panelboard and switchboard configurations.
Are lugs included with the HEG3B015B?
No. Lugs are not included and must be ordered separately based on your wire gauge requirements.
What trip functions does this breaker include?
The HEG3B015B includes LI trip functions: Long-Time (overload protection) and Instantaneous (short-circuit protection), standard for thermal magnetic MCCBs.