Schneider Electric Square D 8501RSD4V51 Relay

Schneider Electric’s Square D 8501RSD4V51 is a compact, plug-in miniature relay from the Type R family. It features a 12 VDC coil and four Form-C (4PDT) contacts in a socket-mount package, rated for up to 3 A. This four-pole design is well suited for control logic, sequencing, and interlocking tasks in industrial equipment, offering multiple isolated switching paths in one compact unit. The relay is UL-listed with Square D relay sockets and CSA-certified, and is designed for use with the compatible 8501 NR socket to form a complete plug-in control module in control panels, material handling, lighting, HVAC/R, and other industrial applications. The 8501RSD4V51 is part of the Square D 8501 Type R relay family, providing a rugged solution for logic elements and power switching where space is at a premium. The coil voltage is 12 VDC, allowing straightforward integration with common PLCs and control circuits that provide low-voltage DC control signals, and its plug-in construction simplifies field installation and replacement without soldering. When paired with the appropriate socket, this relay can be located in cramped control cabinets and used to drive multiple loads or interlock safety circuits, making it a versatile choice for manufacturers and maintenance engineers seeking a reliable, industry-standard control relay.