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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Siemens Q2100 100-Amp Double Pole Type QP Circuit Breaker

Product ID: 343629932

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Details

Brand
SIEMENS
Current rating
100 Amps
Circuit breaker type
Standard
Mounting type
Plug-In Mount
Number of poles
2

⚡100 Amp power capacity

🔌Double pole 240V design

🛡️10,000 AIC interrupting rating

Description

⚡ Break limits, not circuits — Siemens Q2100 keeps your power flawless!

INSTANT INSTA WIRE - Time-saving plug-in connections for seamless installation
DUAL POLE PRECISION - 240V double pole design ensures balanced circuit control
POWERHOUSE PROTECTION - Handles up to 100 Amps for robust electrical safety
ULTIMATE SAFETY SHIELD - 10,000 AIC rating guards against severe electrical faults
CERTIFIED COMPATIBILITY - Works flawlessly with Siemens PL & ES load centers

The Siemens Q2100 is a 100-Amp, double pole Type QP circuit breaker designed for 240V systems, offering a high 10,000 AIC interrupting rating. It features easy plug-in Insta-Wire connections compatible with Siemens PL and ES series load centers, providing reliable overload and short-circuit protection to safeguard your electrical system and maintain warranty integrity.

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

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