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The Scutum-Centaurus Arm (i.e., Scutum-Crux Arm) is one of two major Milky Way spiral arms, i.e., the two arms rooted at its bar, the other being the Perseus Arm. Such arms contain star-forming regions, and a major star forming region is at the point where the Scutum-Centaurus Arm meets the bar.
The solar system is in neither of these: its current position is in one of the Milky Way's minor arms termed the Orion-Cygnus Arm (aka the Orion Arm, Local Arm, Orion Bridge, or Orion Spur).