Schneider Electric Telemecanique ZBVB4 Light Block

Schneider Electric Telemecanique ZBVB4 Red LED Light Block is a front‑mounted, maintenance‑free indicator for Harmony XB4/XB5 Ø22 mm illuminated push buttons and pilot lights, using a protected integral red LED to clearly signal machine status. It is designed for direct supply from 24 VAC/DC (50/60 Hz), with supply limits of 19.2–30 VDC or 21.6–26.4 VAC, and consumes about 18 mA through screw‑clamp terminals accepting 0.22–1.5 mm² conductors. The light block installs on compatible Harmony XB4/XB5 Ø22 mm operator heads and provides a steady signaling output. Key durability specs include a rated service life of 100,000 hours at 25°C and a surge withstand of 1 kV (IEC 61000‑4‑5), with a tightening torque of 0.8–1.2 N·m and a weight of 0.017 kg. In practical use, the red LED visually indicates stop, fault, alarm, or emergency conditions within industrial panels such as control gear, motor control centers, OEM machinery, and factory automation systems. Note that this model is discontinued and replaced by the universal LED light block ZBVB1; common replacements include ZBVB3 and ZBVB5.