Square D 8501RSD34V51 Plug-in Relay 5A 4PDT 12VDC

Product Description

The SQUARE D 8501RSD34V51 is an electromechanical plug-in general purpose relay designed for control circuit switching in industrial and commercial applications. It features a 4PDT contact configuration rated at 5 amps at 240 volts AC, with a 12-volt DC coil for low-voltage control. The plug-in terminal design allows for fast installation and replacement without rewiring the base socket. This relay is UL Recognized, CSA certified, CE marked, and RoHS compliant, making it suitable for installations requiring documented component certifications. Licensed electricians and automation technicians are the primary installers of this type of relay.

This relay is used in residential, commercial, and light industrial control panels where multi-pole switching is required. Typical applications include HVAC control circuits, motor starter auxiliary contacts, lighting contactors, and general switching logic in relay panel assemblies. The 4PDT format provides four independent poles, each switching between two positions, giving control designers flexibility in circuit layout. The 12-volt DC coil suits low-voltage control systems commonly found in building automation and HVAC equipment.

Key Features

• 4PDT contact form — four independent poles for versatile switching configurations
• 5-amp contact rating at 240 volts AC for reliable control circuit performance
• 12-volt DC coil for compatibility with low-voltage control systems
• Plug-in terminal type enables fast field replacement without rewiring the socket base
• UL Recognized, CSA certified, CE marked, and RoHS compliant

Compatibility

Designed as an OEM-style plug-in replacement relay for compatible 4PDT relay socket bases used in industrial and commercial control panel applications.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the NEC and any applicable local codes. De-energize and lock out the control panel before removing or inserting the relay. Verify the socket base pin configuration matches the 8501RSD34V51 before seating the relay. Confirm coil voltage at the socket matches the 12-volt DC rating before energizing the circuit.