will it work with 120 volts?

Yes and No. This is a double pole breaker and intended to be for 220/240 volt usage which means it is for something big, like a range, a dryer, or in my case, a tankless water heater. This would instantly kill (blow up) anything 110/120V that you tried to plug into if both poles were hooked up. For 110/120 volts you really want a single pole breaker. You also want to pay attention to the amps. Most items that run off of 110/120 volts wouldn't need more than 10 amps. Microwaves and Power tools would be the common exceptions. Most people will run more than 10 amp breakers so you can run more than one thing at a time. 15 or 20 amps are the most common for homes (20 for Microwaves and outlets used for Power Tools). The only possibility I could imagine why a panel in a house would have a single pole 70 amp breaker in it would be that it was acting as a sort of main breaker for all the smaller breakers (meaning not the double pole breakers). If you ran too many items in your house at once, you could trip the 70 amp breaker while never tripping any of the smaller ones. This would be the nuisance of this arrangement (The advantage would be having a way to turn off everything all at once without having to turn off the big stuff). But for that I'd just stay with the single pole. As for the Yes argument, You could just hook up one side and that would allow you to run 110/120 Volts, but it takes up an extra slot in your panel and for many of us all those slots are precious. You could use the other side for something else (I'm not sure what), but you need to remove the bar connecting the two switches so they can operate independently. At this point you would just have two single pole 70 amp breakers that happen to be attached to each other. Not knowing your application, I would really recommend a single pole for 110/120 Volts.

Can this breaker be used as a main breaker with a hold down kit ?

Yes as long as you use the hold down kit

what brand circuit breakers will fit in a murray box?

The Siemens QP, QT, QAF, and QPF are the standard "interchangeable" plug-on type breakers used in load centers under several brand names including Siemens, Murray, Gould, and Sylvania to name the most common

will this fit crouse hinds breaker?

All I know is that,"...Crouse-Hinds bought Murray, and then Siemens bought Crouse-Hinds."

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Description

🔋 Power Up Your Safety Game!

TIME SAVING DESIGN - Experience the innovative insta-wire feature that cuts installation time in half.
POWERFUL PROTECTION - Safeguard your electrical system with 100 Amps of overload and short-circuit protection.
ROBUST SAFETY RATING - Rest easy with a 10,000 AIC interrupting rating, ensuring maximum safety during electrical faults.
SEAMLESS INTEGRATION - Enjoy hassle-free installation with easy plug-in connections designed for Siemens enclosures.
VERSATILE COMPATIBILITY - Compatible with Siemens PL and ES series load centers for versatile applications.

The Siemens Q2100 is a 100-Amp Double Pole Type QP Circuit Breaker designed for reliable overload and short-circuit protection. With a robust 10,000 AIC interrupting rating and easy plug-in installation, it seamlessly integrates into Siemens load centers, making it a must-have for any professional electrical setup.

Specifications

Brand	SIEMENS
Current Rating	100 Amps
Product Dimensions	2.5"D x 3.5"W x 5"H
Circuit Breaker Type	Standard
Mounting Type	Plug-In Mount
Number Of Poles	2
UPC	783643148680 040892179392
Manufacturer	Siemens
Global Trade Identification Number	00783643148680
Part Number	Q2100
Item Weight	8 ounces
Item model number	Q2100
Is Discontinued By Manufacturer	No
Size	100 Amp
Color	black
Style	1 Pack
Material	Copper
Pattern	Breaker
Shape	Shape
Thickness	1 Inches
Power Source	Wired Electric
Voltage	120 Volts
Amperage Capacity	100 Amps
Item Package Quantity	1
Number Of Pieces	1
Included Components	Unit^Instruction Guide
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 Year

Reviews

K**G

Reliable and Easy to Install Breaker

I purchased this Siemens 30-amp double pole breaker for my panel, and it worked exactly as expected. The build quality feels solid, and it snapped into place securely with no issues. Installation was quick and straightforward—it seated firmly, and the connection was tight, giving me confidence in the fit.Once installed, it performed flawlessly. It handles the load without any problems, and I’ve had no tripping or overheating. Siemens breakers are known for being reliable, and this one is no different. It also fit perfectly in my Siemens panel, which isn’t always the case with off-brand breakers.Overall, this is a dependable breaker that does exactly what it’s supposed to do. If you’re working with a Siemens panel and need a 30-amp double pole, this is the right choice.

1.09.2025

D**M

Good quality

Solid and reliable! This Siemens breaker was an exact fit in my panel and installed without any issues. Provides consistent performance and gives peace of mind knowing it’s a genuine Siemens part. The double pole design works perfectly for high-demand appliances, and the build quality feels very durable. Great product at a fair price—highly recommend!

30.08.2025

S**W

Exact fit. Perfect

Works perfectly for my service to camper

12.09.2025

C**O

works well

fit in my seimens panel fine

4.09.2025

G**H

Good Deal

Good price for a 100amp breaker, would recommend this seller

30.08.2025

J**.

Fits Perfectly!

This was a perfect fit for a 52 year old Circuit Breaker box. The old breaker would flip for no reason at all. I am assuming it was simply worn out. This replacement has had 0 issues since installation.

11.09.2025

M**N

Fits and works well

It took me three tries to find the right CB for my electrical panel, but this one fit perfect and snapped right in. Easy to install for the do-it-your-self-er. Who knew electrical panels were so un-standard!!!

28.07.2025

J**A

Great product for the value.

Just as expected, and I was about to buy it locally but but I was able to save almost 50% buying it from this vendor online

4.08.2025

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