Square D EI-306-1 Electrical Interlock For 60 Amp Switch

Square D EI-306-1 Electrical Interlock Kit (EI3061) is a field‑installable interlock for Square D 60 A safety switches, designed to add interlock functionality to the 60 A switch family. It uses a single‑pole, double‑throw (SPDT) contact arrangement with one normally open and one normally closed contact (1NO/1NC), enabling interlock logic between linked devices. Compatible with Square D general‑duty safety switches rated from 30 A to 60 A, the EI‑306‑1 interlock is commonly cataloged as EK3061 by Schneider Electric and EK306‑1 by distributors for 60 A models. In the market, it is marketed specifically as a 60 A interlock kit for Square D safety switches, with retailers such as Cooper Electric listing EK3061 and PioneerBreaker listing EK306‑1 as compatible interlock options.