Model # MP120U

Internet #202315521

Store SKU #701793

Store SO SKU #516939

Murray 20 Amp Single-Pole Type MP-Circuit Breaker


20 Amp Single-Pole Type MP-Circuit Breaker

  • Provides a manual means of energizing and de-energizing a circuit
  • Easy plug in connections in Murray load centers
  • Accepts #14-6 AWG Cu or #14-6 AWG Al wire
$456 /each
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Frequently Bought Together

Product Overview

Murray offers a wide array of thermal-magnetic circuit breakers that are the key element for overload and short-circuit protection of your home's electrical system. To provide additional protection Murray offers circuit breakers to protect against severe electrical shock or electrocution, mitigate the risk of electrical fires and protect against damaging surges and voltage spikes. Circuit breakers are intended for switching and protection of your home's wiring from high temperatures caused by excess current higher than the rating of the wire. While thermal-magnetic circuit breakers are the key element for overload and short-circuit protection of your electrical system, there are potentially dangerous conditions that do not involve over current.

  • Single pole, 20 Amp 120V type MP circuit breaker
  • 10,000 AIC interrupting rating
  • Murray type MP circuit breakers provide easy plug-in connections in Murray enclosures and the time saving insta-wire feature
  • Compatible with Murray rock solid load centers
  • Use for overload and short-circuit protection of your electrical system
  • Thermal-magnetic
  • Learn More About Circuit Breakers Here in our Buying Guide.

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Breaker Type
Single Pole
Electrical Product Type
Interruption Type
Standard Trip
Maximum Amperage (amps)
Mounting type
Plug In
Number of Poles
Power Distribution Features
No Additional Features
Product Weight (lb.)
Voltage (volts)

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty

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Customer Questions & Answers

Wire gauge spec

The description of this 20A breaker states wire gauge of #14-#16. It's my understanding that #12 is required for 20A circuits. Why the discrepancy?
Asked by: RetiredJoe
In reply to the Siemens Product expert. You stated this: "The wire gauge would be up to #14-#16, you are correct in most cases you would use #12 on a 20 Amp circuit." So I can only conclude that this circuit breaker should NOT be used as protection for a 20 Amp circuit if I follow the NEC spec of using #12 wire. Is that a correct conclusion?
Answered by: RetiredJoe
Date published: 2016-10-11

Size Spec for breaker

Spec sheet on your website shows a product width of 3.5 inches. Please confirm. This appears very large for this breaker. It's more likely that it's closer to 1" in width as seen from the front of power panel with breaker installed. Thanks
Asked by: Seb
I think you are looking at a 2 pole 20A, which would be about the size you mention. 1 pole Murrays are usually about 1" wide. Also tandem breakers (thin) = 2 breakers in the space of 1 regular breaker to add circuits where panel box space is limited.
Answered by: bf
Date published: 2016-03-12

can use 12 gauge wire with this 20 amp breaker

can use 12 gauge wire with this 20 amp breaker
Asked by: Ron
Hello Ron, You will want to use a wire within the range of #14-#16 for your MP120 breaker
Answered by: SIEMENS Product Expert
Date published: 2017-05-20

Why can't I get this breaker shipped to my house, not express shipping?

Example: I have looked at the manual and can't figure out what I did wrong.
Asked by: Joe
Hi Joe, this item is currently in stock online. The will allow you to place the order for whatever quantity is available at the time in the online inventory. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
Answered by: THDSupport
Date published: 2016-11-23
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Customer Reviews

20 Amp Single-Pole Type MP-Circuit Breaker is rated 4.7 out of 5 by 3.
Rated 5 out of 5 by from I was very surprised to receive these as fast as... I was very surprised to receive these as fast as promised. They are exactly what I needed and worked perfectly.Ja
Date published: 2017-03-08
Rated 4 out of 5 by from Fits like a glove. Slipped it into by Crouse Hinds breaker box / Load Center and it is working fine.
Date published: 2015-03-13
Rated 5 out of 5 by from worked It's a breaker. It worked as it should. Delivery was quick.
Date published: 2014-07-22
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