National Safety Breaker ZN-57, 2 Pole, 20ANational Safety Breaker ZN 57 delivers reliable circuit protection for residential and light commercial applications. This 2 pole, 20A breaker features robust construction designed to handle standard electrical loads while safeguarding against overloads and short circuits. Built with quality engineering, the ZN 57 integrates seamlessly into standard distribution boards. The dual pole configuration provides synchronized protection across two circuits,