Strombegrenzende Sicherung — current-limiting fuse (A50QS60 4, A50QS70 4, A50QS80 4) Key benefits Limits fault current quickly to prevent damage to wires, components and downstream devices. Reduces equipment damage and downtime by capping extreme currents at the moment of a fault. Improves system reliability and reduces unplanned outages by stopping fault escalation. Simple integration into common panel protection schemes; same mounting and interface across the A50QS60 4, A50QS70 4 and A50QS80 4 models for easy replacement or scaled protection. Choice of model-specific current-limit settings to match protection to your load and risk profile. What it does Function: rapid current limiting during short-circuits, faults or overloads to stop high fault currents from propagating. Compatibility: designed for standard electrical installations and common panel arrangements; identical mounting/interface across the three models for straightforward integration. Size: compact form factor suitable for panel boards and small enclosures where space is limited. Material: robust enclosure built for typical electrical environments to withstand normal installation and operation conditions. Performance: model-specific current-limit characteristics with fast response and stable operation under fault conditions. Practical applications and use scenarios Industrial control panel: Protect PLCs, I/O modules and variable-speed drives from damaging fault currents in a compact control cabinet. Select the A50QS model with the appropriate current-limit setting for the expected motor and drive loads. Test lab or equipment rack: Protect power supplies, measurement instruments and DUTs on a test bench or rack-mounted system where rapid fault limiting reduces repair time and preserves sensitive devices. Motor control in compact machines: Use in compact drives and small machinery to limit inrush and short-circuit currents, protecting motor windings, contactors and downstream electronics. Installation notes Replace or select the A50QS60 4, A50QS70 4 or A50QS80 4 based on the required current-limit setting for your circuit; mounting and electrical interface are consistent across the family for straightforward deployment. Intended for use within standard electrical distribution and control schematics as part of a coordinated protection strategy. The Strombegrenzende Sicherung family provides fast, reliable current limitation to minimize damage, simplify protection design and improve overall system uptime.