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If what you term as a "magnetic switch" is an electrical contactor, then the answer is yes.
A couple things to keep in mind. I presume the 125 volts mentioned is the coil voltage of the contactor.
The switched voltages and amperage or horsepower allowed by the contactor is on the contactor's nameplate. This is the maximum voltage that can be applied to the contactor which includes 12 volts.
The amperage of the 12 volt device is not mentioned and this should not exceed the maximum allowed current of the lowest voltage rating of the contactor. This is especially true if the 12 volts is Direct Current. An example of this could be a starter on a car. When the starter starts to crank it could be in the neighbourhood of 300 amps DC. As you can see this would fry the contacts of a normal AC rated contactor.
No, a 125V magnetic switch is not recommended for use in a 12V system. The switch may not operate reliably or safely at the lower voltage, which could lead to malfunctions or damage. It's best to use a switch rated for the specific voltage of the system to ensure proper functionality.
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