Siemens HB3B050 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Siemens
HB3B050
Molded Case Circuit Breaker
Brand
Siemens
SKU
HB3B050
Quantity
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Siemens HB3B050 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Part of the HBQ series, the Siemens HB3B050 is a 3-pole, 50A MCCB built for commercial power distribution. It features a thermal-magnetic trip unit delivering reliable long-time and instantaneous (LI) protection. This bolt-on breaker installs into Siemens and ITE Series 1-5 legacy panelboards. It utilizes standard load side lugs accommodating 8-1 AWG copper or 6-1/0 AWG aluminum wire. Delivering 65kAIC at 240VAC, it handles severe fault currents. It is HACR rated and meets UL 489 standards.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HB3B050 |
| Series | HBQ |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens/ITE Legacy Panelboards (Series 1-5) |
| Wire Gauge | 8-1 AWG (Cu), 6-1/0 AWG (Al) |
| Max Wire | 1 AWG (Cu), 1/0 AWG (Al) |
| Min Wire | 8 AWG (Cu), 6 AWG (Al) |
| 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
9 answersWhat panelboards are compatible with the HB3B050?
This bolt-on breaker is designed for use in Siemens and legacy ITE panelboards, specifically Series 1 through 5. It mounts directly to the busbar using a bolt-on connection.
Can this breaker be used in a standard plug-on load center?
No, the HB3B050 features a bolt-on connection type. It is not compatible with plug-on load centers and must be installed in panelboards designed to accept bolt-on BQ or HBQ frame breakers.
What does the HBQ designation mean compared to standard BQ breakers?
The HBQ designation indicates a high-interrupting capacity version of the standard BQ frame. While standard BQ breakers typically offer a 10kAIC rating, the HB3B050 provides a 65kAIC rating at 240VAC for systems requiring higher fault current protection.
Is this breaker rated for 480V or 600V systems?
No, the HB3B050 is strictly rated for a maximum of 240VAC. It cannot be safely used in 480V or 600V electrical systems.
Can the HB3B050 be used in series-rated combinations?
Yes, HBQ breakers are frequently used in series-rated systems with upstream Siemens main breakers or fuses to achieve higher overall short-circuit current ratings. Always consult the panelboard series rating chart to verify approved combinations.
What wire sizes are accepted by the load lugs on this breaker?
The factory-installed load lugs accept 8 to 1 AWG copper conductors or 6 to 1/0 AWG aluminum conductors. Ensure all connections are torqued to the manufacturer specifications listed on the breaker label.
Are line-side lugs included with the HB3B050?
Standard HBQ circuit breakers are supplied with load-side lugs only, as the line side bolts directly to the panelboard bus. If line-side lugs are required for a standalone application, a version with the L suffix must be sourced.
Can I use the HB3B050 to replace an older ITE 50A bolt-on breaker?
Yes, the Siemens HB3B050 is the direct replacement for older ITE and Siemens 50A, 3-pole, 65kAIC bolt-on breakers sharing the BQ frame footprint.
Does this breaker include internal accessories like a shunt trip?
No, the standard HB3B050 comes with a fixed thermal-magnetic trip unit and does not include factory-installed internal accessories like shunt trips or auxiliary switches.
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