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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🛡️ Power up with confidence — protect your space the Siemens way!

DUAL POLE PROTECTION - Ensures superior overload and short-circuit defense for critical circuits.
COMPACT DIN RAIL MOUNT - Space-saving design for easy installation and professional-grade setup.
RELIABLE 20 AMP CAPACITY - Handles high electrical loads with ease for your home or office.
SIEMENS WARRANTY ASSURANCE - Maintain your panel’s warranty by using genuine Siemens breakers only.
240 VOLT POWER COMPATIBILITY - Designed to seamlessly integrate with standard residential and commercial systems.

The Siemens Q220 is a 20 Amp, 240 Volt double-pole thermal-magnetic circuit breaker engineered for reliable overload and short-circuit protection. Designed for residential and commercial electrical systems, it ensures safety by preventing electrical fires and shocks. Its compact DIN rail mount and genuine Siemens build guarantee seamless installation and warranty compliance.

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Manufacturer	SIEMENS
Part number	Q220
Item Weight	227 g
Product Dimensions	7.62 x 5.08 x 7.94 cm; 226.8 g
Item model number	Q220
Size	20 Amp
Color	black
Voltage	240 Volts
Item Package Quantity	1
Number Of Pieces	1
Plug Profile	DIN Rail Mount
Batteries Included?	No
Batteries Required?	No

SIEMENS Q220 20-Amp Double Pole Type QP Circuit Breaker

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