GCA177GF1 GOA177AM3 Xizi Otis escalator stroke limit switch Bi2-SU1Z w

QM-SK560A1 and XAA177BE1 (Otis part number) are actually the same product.

XAA177BE1 and XAA177BE2 are common, the only difference is the location of the outlet holes on both sides. QM-SK560A1 can replace GCA177GF1