Square D (Schneider Electric) XB4BS8444 Harmony Non-Illuminated Pushbutton. Schneider Electric Harmony™ Square D™ Non-Illuminated Pushbutton, Series: XB4, 22 mm Size, 2NC Contact Configuration, Maintained Contact Mode, 1.2 A at 600 VAC/0.1 A at 600 VDC Contact, Mechanical Latching/Trigger Action/Turn to Release/Unmarked Operator, Legend: EMERGENCY STOP, Bezel/Housing: Chromium Plated Metal, Mushroom Head/Round Actuator, Screw Clamp Terminal, NEMA 4/4X/13/IP66/IP67/IP69/IP69K/IK06 Enclosure, Panel Mounting, Red, Environmental Conditions: -13 to 158 deg F Oper. Additional Description: SQD -XB4BS8444 TRIGGER E-STOP. Catalog Description: Harmony XB4, Emergency stop switching off, metal, red mushroom, Ø40, Ø22, trigger latching turn to release, 2 NC.