Siemens HEG3B070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Unit Mount
Quantity
Siemens HEG3B070 - 70A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for heavy-duty power systems, the Siemens HEG3B070 is a 70A, 3-pole circuit breaker belonging to the VL Series EG frame family. It provides dependable thermal-magnetic protection for commercial and industrial facilities. This breaker installs into Siemens P4 and P5 panelboards, switchboards, and enclosures. It requires separate lug kits for wire termination and replaces older legacy models. Rated at 65kAIC at 480VAC and 100kAIC at 240VAC, it offers exceptional fault current interruption.Specifications
| Brand | Siemens |
|---|---|
| Series | HEG |
| Amperage | 70A |
| 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 |
| Frame Type | EG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards, 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 |
|---|---|
| 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 |
Product FAQs
8 answersWhich Siemens panelboards accept the HEG3B070 breaker?
The HEG3B070 is a unit mount breaker designed for installation in Siemens P4 and P5 panelboards, as well as compatible switchboards and standalone enclosures.
Is the HEG3B070 rated for direct current (DC) systems?
Yes, in addition to AC ratings, this breaker is rated for DC systems. It provides a 30kA interrupting capacity at both 250VDC and 500VDC.
What does the H in the HEG3B070 part number signify?
The H designates this as the high interrupting capacity version of the Siemens EG frame. It provides a 65kAIC rating at 480VAC, which is higher than standard EG frame breakers.
How is the HEG3B070 installed in a panelboard?
This is a unit mount, bolt-on circuit breaker. It does not snap onto a DIN rail or busbar; it must be bolted directly into the chassis of a compatible P4 or P5 panelboard or enclosure.
Can the trip curve be adjusted on the HEG3B070?
No, this breaker uses a thermal magnetic trip unit with fixed thermal and fixed magnetic settings. The long-time and instantaneous trip functions cannot be adjusted in the field.
What wire gauge is supported by the standard lugs on the HEG3B070?
The factory lugs accept 14 AWG through 1/0 AWG wire and are rated for both copper (Cu) and aluminum (Al) conductors.
What is the maximum amperage of the frame used for the HEG3B070?
The HEG3B070 is built on the Siemens EG frame, which has a maximum physical frame rating of 125 amps.
What does the LI trip function code mean on this breaker?
The LI code indicates that the breaker provides Long-Time and Instantaneous trip functions, which offer standard overload and short-circuit protection.
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