ZB4BVG3 is a complete light block with body/fixing collar for Harmony XB4 22 mm heads, featuring a green LED and 110–120 VAC operation. The unit has a metal body with a zamak fixing collar and uses screw-clamp terminals for connections (2 × 1.5 mm² with cable end, 1 × 0.22 mm² without). As part of Schneider Electric's Harmony XB4 signaling family, it pairs with 22 mm indication heads to provide visible green signaling in 110–120 VAC systems.
