The Siemens 6ES7120-0BH01-0AA0 is a spare-part terminal block for the SIMATIC SC system, used to expand analog and digital SC electronic modules with spring-type terminations. It accepts up to eight single-width electronic modules; the spring cages on each slot take solid or ferruled stranded wire typical of control wiring. The supply current path is rated for 8 A via the 1L+ and 2L+ terminals, with a per-slot limit of 1.5 A when the supply is fed in parallel. That per-slot figure governs how many modules you can populate without exceeding the backplane capacity.
Mounting and isolation
The block is 145 mm wide, 100 mm high, and 40.5 mm deep. Its isolation is tested at 4 000 V DC. Mounts to a DIN rail in the standard SIMATIC SC carrier; the shallow 40.5 mm depth leaves headroom in shallow enclosures.