Siemens / ITE HM3B500 Molded Case Circuit Breaker
- 500A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE HM3B500 - 500A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for heavy-duty commercial applications, the Siemens HM3B500 provides 500A of reliable thermal-magnetic protection. It includes an interchangeable trip unit with adjustable magnetic settings. As a legacy M-frame component, it installs into Siemens P4 and P5 panelboards, switchboards, and motor control centers. This exact-fit replacement eliminates the need for modern adapters.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | HM3B500-R |
| Series | HM |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 50kA @ 600VAC, 50kA @ 500VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P4/P5 Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 3/0 AWG - 500 kcmil Cu/Al |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
6 answersWhat equipment is the HM3B500 designed to fit?
As a legacy M-frame component, this breaker installs directly into Siemens P4 and P5 panelboards, switchboards, and motor control centers. It provides an exact-fit replacement that eliminates the need to retrofit modern adapters.
What are the wire size requirements for the HM3B500 lugs?
The included lugs accommodate two conductors per phase. They accept copper or aluminum wiring ranging from 3/0 AWG up to 500 kcmil.
How does the trip unit operate on this breaker?
It utilizes an interchangeable thermal-magnetic trip unit. The thermal element provides fixed long-time overload protection, while the magnetic element is adjustable to fine-tune the instantaneous short-circuit response.
Is the HM3B500 suitable for direct current systems?
Yes, in addition to its standard AC ratings, this breaker is fully rated for DC applications. It provides a 50kA interrupting capacity at 500VDC.
Does this breaker require a special mounting kit?
No, the HM3B500 features a standard bolt-on connection. It fastens directly to the bus in compatible Siemens enclosures without requiring additional mounting hardware.
Can this be used to replace an older ITE breaker with the same part number?
Yes. Because Siemens acquired ITE and maintained the product line, the Siemens HM3B500 is a direct, exact-fit replacement for legacy ITE breakers sharing the same catalog number.
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