Siemens HGB3K050B Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
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Siemens HGB3K050B - 50A 3 Pole Molded Case Circuit Breaker
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Description
Siemens HGB3K050B molded case circuit breaker is rated 50A with 3 poles and rated voltages of 240VAC, 480VAC and 600Y/347VAC. It has an interrupting rating of UL 489 35kA at 480VAC, a fixed thermal magnetic trip and LI trip function. The HGB series breaker features a GB2-Frame, panel board mounting, a load side lug terminal connection and an 8 - 1/0 AWG conductor range.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HGB3K050B |
| Series | HGB |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600Y/347VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 14kA @ 600Y/347VAC |
| Frame Type | HGB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards |
| Wire Gauge | 8-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Alarm Switch, Auxiliary Switch, Shunt Trip |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed |
Product FAQs
8 answersHow should I use the 50A rating when selecting the Siemens HGB3K050B?
The 50A rating is the basis for selecting this breaker's current protection. Match it to the circuit's load requirements and conductor protection requirements.
How do I evaluate the interrupting rating for a 480VAC installation?
The UL 489 interrupting rating is 35kA at 480VAC. For selection at that voltage, the available fault current at the installation point must not exceed 35kA.
What system voltages can I select this breaker for?
The voltage ratings are 240VAC, 480VAC, and 600Y/347VAC. Match the circuit's voltage and system configuration to the applicable rating, including the wye configuration indicated by 600Y/347VAC.
What does the thermal-magnetic LI trip do?
The thermal-magnetic LI trip combines time-delayed overload protection with instantaneous short-circuit protection. The thermal element responds to sustained overloads, while the magnetic element responds rapidly to high fault current.
Can I adjust the trip settings during commissioning?
The trip settings are fixed. Plan protection coordination around the breaker's fixed trip behavior rather than field-adjustable settings.
What conductor sizes can I use at the load-side connection?
The load-side lug accepts conductors from 8 AWG through 1/0 AWG. Select a conductor within that range while also meeting the circuit's ampacity requirements.
What dimensions should I allow for equipment layout?
The breaker measures 5.40 in high, 3.00 in wide, and 2.80 in deep. Use these dimensions when planning equipment layout and space allocation.
What does the 3-pole rating mean for circuit protection?
The Siemens HGB3K050B has three poles for overcurrent protection of the three phase conductors. Use the pole count when planning which circuit conductors require protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
- CSCody S.Verified BuyerReviewingSiemens HGB3B020B - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/1/25I love SuperBreakers
Excellent shipping time and everything works perfectly
- JMJessica M.ReviewingSiemens HGB3B020B - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/16/23works as intended
works as intended