This Siemens 6ES7120-0AH50-0AA0 is a spare terminal block for the SIMATIC SC interface module (IM-SC), with screw-type terminals for field wiring. It provides the power feed path for connected I/O modules: the 1L+ and 2L+ supply lines each carry up to 8 A. Use it to supply power to a compact SC distributed I/O cluster — keep the two 8 A feeds separate for redundant or segregated load groups. That keeps the line running without a single point of power failure.
Ratings that matter
The 2x 8 A rating via 1L+ and 2L+ means two independent power feeds, each rated 8 A. You can split the I/O module groups across the two supplies, or use one for power and one for a separate voltage level. Don't exceed 8 A per terminal under continuous load. Isolation tested at 4 000 V DC between the terminal block and the backplane. It verifies insulation integrity.
Sourcing and fit
Size: 160 mm wide, 100 mm high, 73.6 mm deep. Mounts on DIN rail.