ABB 3HNE 05281-1 Barrier

ABB 3HNE05281-1 ZB-03 Zener Barrier is an intrinsically safe barrier module used with ABB S4PPlus control systems to safely isolate end‑of‑arm tooling and sensors from hazardous-area circuits. It supports a maximum system voltage of 250 V (Um) and provides an output current of 105/121 mA (Io) with a dissipation of 0.4/0.7 W (Po). The barrier accepts an input supply of +12 V to −18 V (Un) and is rated for ambient temperatures up to 60 C (Tamb). Protection is specified as Ex Ib for IIb/Iic gas groups and, when configured for Division 1 service, serves Cl.I, II, III environments. The device is identified by ABB part number 3HNE05281-1 and is commonly referenced as ZB-03, with a barrier resistance around 209/294 Ω (Rt) and related documentation such as drawing 3HNE06150-1. Weight is typically around 0.5 kg. It is used in robot end-of-arm tooling safety circuits to ensure intrinsically safe operation in hazardous areas.