Siemens / Murray MP120 Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Quantity
Siemens / Murray MP120 - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens / Murray MP120 - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens / Murray |
|---|---|
| Part Number | MP120 |
| Series | MP |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | None included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Insta-Wire |
Quantity
Siemens / Murray MP120 - 20A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens / Murray |
|---|---|
| Part Number | MP120-R |
| Series | MP |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | None included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Insta-Wire |
Description
Handling up to 20 amps of current, the Siemens MP120 delivers robust thermal-magnetic protection for residential applications. This single-pole plug-on component is SWD rated for switching fluorescent lighting loads. It installs into classic Murray enclosures, providing a safe maintenance solution for older systems. When a complete panel upgrade occurs, the Q120 serves as the modern replacement. A 10kAIC interrupt rating ensures reliable performance during fault conditions.Specifications
| Brand | Siemens / Murray |
|---|---|
| Part Number | MP120-R |
| Series | MP |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Murray Load Centers, Siemens Load Centers |
| Wire Gauge | 14-8 AWG (Cu), 12-8 AWG (Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | None included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, SWD Rated, Insta-Wire |
Product FAQs
7 answersIs the Murray MP120 interchangeable with Siemens breakers?
Yes. Siemens acquired Murray and phased out the Murray brand. The Siemens Q120 (Type QP) is the direct, UL-listed replacement for the Murray MP120 (Type MP-T), and they are interchangeable in compatible Siemens and Murray load centers.
What type of breaker is the MP120?
The MP120 is a Type MP-T standard 1-inch plug-on circuit breaker. It is designed for use in Murray and Siemens load centers that accept Type MP-T or Type QP branch breakers.
What does the LI trip function on this breaker indicate?
The LI designation stands for Long-Time and Instantaneous trip functions. This means the breaker uses standard thermal-magnetic technology to protect against both gradual overloads (Long-Time) and sudden short circuits (Instantaneous).
Is the MP120 breaker SWD rated?
Yes, standard 15A and 20A Type MP-T breakers like the MP120 are SWD (Switching Duty) rated, meaning they are approved for switching 120V fluorescent lighting loads on and off on a regular basis.
Is the MP120 HACR rated?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific circuit protection.
Can I use the MP120 in a load center from a different manufacturer?
No. The MP120 is UL listed specifically for use in compatible Murray and Siemens load centers. Installing it in panels from other brands violates UL listings and National Electrical Code requirements.
Does this breaker require a neutral connection?
No, the MP120 is a standard thermal-magnetic breaker and does not require a pigtail or plug-on neutral connection. It snaps directly onto the bus bar of the load center.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 4 reviews.
- JVJulie V.Verified BuyerReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars3/5/26on breaker
so far so good on the refurbished breaker
- JFJon F.ReviewingSiemens / Murray MP250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/17/20Sales
Fantastic group to work with...
- DSDavid S.ReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars1/5/20Thank you so much for
Thank you so much for sending me a 100 amp breaker that was in the condition that you said it would be in.With out your breaker I would still be in the dark Thank you David
- RARichard A.ReviewingSiemens / Murray MP2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/13/19Awesome!
Your prices and number of available items to choose from is Awesome!