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The Zinsco QCAL100 Replacement Circuit Breaker is a 100 Amp, 120/240 Volt thermal breaker suitable for wall mounting, both interior and exterior. It features a 2-pole design with two outlets and offers phase control and thermal overload protection. This main breaker from Zinsco is made of ABS/plastic material, has a black color, and is designed for electrical wiring applications. With its on/off operation method and instantaneous break time, this circuit breaker is a reliable and efficient choice for any room.