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I need a button (or a button couple) that acts as a switch in emergency such that when one pushes the button, the +12V supply line below becomes an open circuit even he releases the button. But I also want the user (after fixing the issue etc.) can push the button (or button couple) and the supply line is closed and device is powered again.

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What type of button/switch or latch can provide such functionality?

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Not surprisingly, these are called "emergency stop switches" and they are readily available.

For safety reasons, however, most are typically reset not by a second push, but by twisting or pulling instead. However dual-button and rocker variants are also available, although they are usually more expensive, especially those with built-in fuses.

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