Siemens HEG3B040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Unit Mount
Quantity
Siemens HEG3B040 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for industrial applications, the Siemens HEG3B040 is a 40A, 3-pole molded case circuit breaker. It belongs to the SENTRON VL Frame series, offering dependable thermal-magnetic trip functions for commercial facilities. Designed for unit mounting, it integrates seamlessly into Siemens P4 and P5 panelboards and switchboards. While this model does not include lugs, it can be upgraded with various lug kits. With an interrupting capacity of 65kAIC at 480VAC, it ensures superior protection.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HEG3B040 |
| Series | HEG |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600Y/347VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 30kA @ 250VDC, 30kA @ 500VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P4, P5 Panelboards, Switchboards, Motor Control Centers, Enclosures |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Lug Kits |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
8 answersWhat panelboards and equipment are compatible with the Siemens HEG3B040?
This 3-pole breaker is designed for use in Siemens P4 and P5 panelboards. It is also compatible with Siemens switchboards, motor control centers, and standalone enclosures that accept Sentron VL frame bolt-on breakers.
What is the accepted wire range for the standard lugs on this breaker?
The factory-installed lugs on the HEG3B040 accept copper or aluminum (Cu/Al) conductors ranging from 14 AWG to 1/0 AWG. Ensure proper torque specifications are followed during installation to maintain a secure, code-compliant connection.
How does the thermal-magnetic trip unit operate on the HEG3B040?
This breaker features a fixed thermal-magnetic trip unit with Long-Time and Instantaneous (LI) functions. The thermal component protects against sustained overloads, while the magnetic component provides immediate tripping during short circuits.
Can the HEG3B040 be used in direct current (DC) power systems?
Yes, in addition to its AC ratings, this breaker is rated for DC applications. It provides a 30kA interrupting capacity at both 250VDC and 500VDC, making it suitable for industrial DC control panels and specialized equipment.
Is the HEG3B040 suitable for use with aluminum wiring?
Yes, the standard lugs are dual-rated for both copper (Cu) and aluminum (Al) conductors. Installers must apply an appropriate oxide inhibitor when terminating aluminum wire to prevent corrosion and ensure a safe, long-lasting connection.
Does the HEG3B040 require a specific mounting connection?
Yes, this breaker utilizes a bolt-on connection type for unit-mount configurations. This provides a secure, vibration-resistant mechanical and electrical connection directly to the panelboard bus.
What frame group does the HEG3B040 belong to?
The HEG3B040 is part of the Siemens Sentron family and is classified under the VL frame group. This information is critical when selecting compatible mounting hardware, lug kits, or replacement parts for existing panels.
Can this breaker be used in 347V commercial lighting systems?
Yes, the HEG3B040 is rated for 600Y/347VAC systems with an interrupting capacity of 25kA. This makes it fully compatible with 347V commercial lighting and distribution networks commonly found in industrial facilities.
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