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Siemens QS2125 Miniature Circuit Breaker
- 125A
- 2 Pole
- Plug-On
Siemens
QS2125
Miniature Circuit Breaker
Brand
Siemens
SKU
QS2125
Quantity
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Siemens QS2125 - 125A 2 Pole Miniature Circuit Breaker
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Description
Part of the QS frame family, this 125A, two-pole miniature circuit breaker provides reliable main or branch protection. It is engineered specifically for multi-tenant residential and commercial distribution networks. Designed to mount into Siemens Power Mod meter stacks and Uni-PAK metering centers, this plug-on breaker replaces the legacy MPD2125. The unit includes load side lugs and supports reverse feed applications. Rated for 10 kAIC, the breaker utilizes a space-saving side-wired design.Specifications
| Brand | Siemens |
|---|---|
| Part Number | QS2125 |
| Series | QS |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Power Mod Meter Stacks, Uni-PAK Metering |
| Wire Gauge | 3 AWG - 300 kcmil (Cu/Al) |
| Max Wire | 300 kcmil |
| Min Wire | 3 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Main Breaker, HACR Rated, Side-wired, Non-Interchangeable Trip, Common Trip, Reverse Feed |
Product FAQs
5 answersWhere is the QS2125 typically installed?
This plug-on main breaker is engineered for multi-tenant residential and commercial distribution networks. It mounts directly into Siemens Power Mod meter stacks and Uni-PAK metering centers to provide reliable branch or main protection.
How does the lug configuration on the QS2125 simplify installation?
The breaker features a space-saving side-wired design with factory-installed load side lugs. This configuration accepts 3 AWG to 300 kcmil copper or aluminum wire and eliminates the need for difficult S-bends inside the enclosure.
What legacy circuit breakers does the QS2125 replace?
The Siemens QS2125 serves as a direct plug-on replacement for the discontinued legacy MPD2125 main breakers.
Is the QS2125 suitable for reverse feed applications?
Yes, this breaker supports reverse feed applications, allowing it to be back-fed when required by the panel configuration.
Are there versions of this breaker with a higher interrupting rating?
Yes. While the standard QS2125 is rated for 10kAIC at 240V, Siemens also offers the QSH2125 for applications requiring a 42kAIC rating, and the HQS2125H for 100kAIC systems.
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