121583-0092 is a 51-way snap-in receptacle connector with secondary lock version, designated APD-2SS51S, featuring yellow color coding (RAL 1018) for visual mating identification and mechanical keying to prevent mis-mating. The connector operates at 48 VDC with a maximum contact resistance of 5 mO and supports a maximum current carrying capacity of 12 A per contact. It is constructed with PBT GF housing, FKM sealing parts, and copper alloy contacts with gold or tin plating, providing excellent durability with 40 mating cycles and a coupling torque of 4.5 Nm maximum. The connector is rated for harsh environmental conditions including temperature range from -40°C to 125°C, humidity up to 95% relative humidity, IP 67 and IP 69k sealing protection, and compatibility with brake fluid, ATF, and fuel. This connector is ideal for automotive, industrial, and marine applications requiring reliable, secure electrical connections in demanding environments.