Schneider Electric 8501-GU44 Universal Pole Attachment Relay

The 8501-GU44 Universal Pole Attachment from Square D (Schneider Electric) is an Adder Pole Attachment that expands a compatible 8501 relay with four normally open and four normally closed poles, enabling broader multi-pole control in compact control panels. Designed to mount on Square D 8501-series NEMA-style relays, this accessory adds 4 normally open (NO) and 4 normally closed (NC) contacts to the base relay, increasing the total contact count without replacing the main device. The unit weighs approximately 0.25 kg, reflecting its small form factor while delivering expanded switching capability. Classified as a universal pole attachment, the GU44 supports extended interlocking, sequencing, and safety interlock configurations common in industrial control schemes that rely on Square D 8501 relays. Note that, according to manufacturer-led and reseller listings, the 8501-GU44 has been discontinued by the manufacturer, which may affect current availability; when found, it is typically sold as new or surplus accessories. Use of this attachment is appropriate when existing 8501 relays require additional pole circuits to handle more complex control logic in machine or panel applications.