Schneider Electric ZB4BW643 Harmony XB4 Emergency Stop Head Red 40 mm Push-Pull Emergency Stop Push Button

The Schneider Electric ZB4BW643 is a Harmony XB4 illuminated emergency-switching-off head, built around a red, 40 mm, unmarked mushroom actuator compatible with a universal-LED light block. It latches mechanically and releases with a push-pull action, mounting in a 22.5 mm panel cutout ahead of a compatible XB4 light-block and contact body.

Technical Specifications

Certifications & Standards

• BV
• CSA
• DNV
• LROS
• UL Listed
• JIS C8201-5-1
• IEC 60364-5-53
• IEC 60947-5-5
• IEC 60947-5-1
• IEC 60947-5-4
• IEC 60947-1
• CSA C22.2 No 14
• UL 508
• JIS C8201-1

Selection Notes

Push-pull reset is faster to operate one-handed than a turn-to-release mushroom, since the operator simply pulls the cap straight out rather than rotating it - a relevant difference where the e-stop sits in a tight enclosure or is reached with a gloved hand. Being built for a universal-LED light block, this head lets the same mushroom double as a status indicator (illuminated when the machine is stopped or faulted), which the non-illuminated ZB4BS844 head cannot do.