Siemens HEG2B040 Molded Case Circuit Breaker
- 40A
- 2 Pole
- Unit Mount
Quantity
Siemens HEG2B040 - 40A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for circuit protection, the Siemens HEG2B040 molded case circuit breaker is rated 40A, 480VAC, with 2 poles and an interrupting rating of 65kAIC at 480V. This single-phase breaker belongs to the VL family and HEG series, with an EG frame. It uses unit mounting and bolt-on terminal connections. Thermal magnetic tripping provides fixed thermal and fixed magnetic settings with long-time and instantaneous trip functions. Protection is standard.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HEG2B040 |
| Series | HEG |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC |
| Frame Type | EG |
|---|---|
| Terminal Type | Lugs |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Standards | NEMA AB 1, UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity |
Product FAQs
7 answersHow should I select the Siemens HEG2B040 for a 40A circuit?
Its 40A rated current is the basis for selecting circuit overcurrent protection. Coordinate that rating with the load requirements and conductor ampacity.
What does the 480VAC rating mean for circuit selection?
The breaker is rated for AC service at 480VAC. Select it for an AC circuit whose operating voltage is within that rating, and evaluate the interrupting rating separately.
How do I evaluate the 65kAIC interrupting rating?
Compare the available fault current at the installation point with the breaker's 65kAIC interrupting rating at 480V. At that voltage, the available fault current must not exceed the interrupting rating.
When should I choose this two-pole breaker?
Choose its two-pole configuration when the single-phase circuit design requires overcurrent protection on two conductors. Pole count should follow the circuit's protection requirements.
How does its thermal-magnetic trip protect the circuit?
The thermal long-time function responds to sustained overloads, while the magnetic instantaneous function responds rapidly to high fault current. This combines overload protection and rapid fault response in one breaker.
Can I adjust the thermal or magnetic trip settings?
Both the thermal and magnetic trip settings are fixed. Select this breaker when fixed trip behavior meets the circuit's protection and coordination requirements rather than relying on field adjustment.
What should I plan for with unit mounting and bolt-on terminals?
Unit mounting calls for an individual breaker mounting arrangement, while the bolt-on terminal connection uses a bolted electrical termination. Plan the mechanical installation and electrical connections around these two requirements.
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