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Siemens QN2175H Molded Case Circuit Breaker
- 175A
- 2 Pole
- Plug-On
Siemens
QN2175H
Molded Case Circuit Breaker
Brand
Siemens
SKU
QN2175H
Quantity
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Siemens QN2175H - 175A 2 Pole Molded Case Circuit Breaker
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Description
Built for higher fault current environments, the Siemens QN2175H is a 2-pole, 175-amp molded case circuit breaker rated for 22kAIC at 120/240V. It provides dependable thermal-magnetic protection for demanding residential and commercial applications. This plug-on unit mounts into Siemens load centers and meter combinations, requiring four panel spaces. It also serves as an exact replacement for the older MPD2175H model. The breaker features common trip functionality and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | QN2175H |
| Series | QN |
| Amperage | 175A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Meter Combinations |
| Wire Gauge | 4 AWG - 300 kcmil (Cu/Al) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment, Shunt Trip |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated, Reverse Feed, Requires 4 Panel Spaces, High Interrupting Capacity |
Product FAQs
5 answersHow many panel spaces does the Siemens QN2175H require?
Although it is a 2-pole breaker, the larger QN frame requires four standard 1-inch panel spaces in compatible Siemens load centers and meter combinations.
What does the H stand for in the QN2175H catalog number?
The H indicates a high interrupting rating. The QN2175H is rated to safely interrupt fault currents up to 22kAIC at 120/240V, compared to the standard QN2175 which is rated for 10kAIC.
Is the QN2175H a certified replacement for obsolete Murray breakers?
Yes. Siemens acquired the Murray brand and consolidated the product lines. The QN2175H is the officially UL-listed direct replacement for the legacy Murray MPD2175H and similar 175A Murray MD-HT frame breakers.
Can this breaker be installed as a back-fed main?
Yes, the QN2175H can be used in reverse feed applications. If you are installing it as a back-fed main breaker, the National Electrical Code requires you to secure it to the load center using an approved panel-specific hold-down kit.
Is the QN2175H approved for HVAC equipment?
Yes, this breaker is HACR rated. It is certified to provide safe overcurrent protection for heating, air conditioning, and refrigeration circuits that require a 175A disconnect.
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