Autonics S2ER-E3RB Emergency Push Button Switch

Autonics S2ER-E3RB is a 22/25 mm emergency stop switch with a red mushroom head and a normally closed (NC) contact block, designed for fast, reliable stop control in control panels and safety circuits. The unit supports 110 VAC or 220 VAC operation depending on the contact configuration and fits through a Ø22 mm (or Ø25 mm) mounting hole for panel installation. It is part of Autonics’ S2ER family of emergency switches and is supplied in a non-illuminated form with a single contact block, with LED blocks sold separately. Typical applications include emergency-stop circuits on conveyors, presses, CNC machines, and other industrial equipment where an immediate stop is required. The compact form factor and NC configuration make it suitable for simple stop-control tasks without auxiliary contacts.