ABB S3L100MWS4 Instantaneous Trip Circuit Breaker

ABB S3L100MWS4 Instantaneous Trip Circuit Breaker is a three‑pole molded‑case protection device that delivers fast short‑circuit interruption for three‑phase power systems. It is rated for 100 A with a voltage rating up to 600 V AC and features an instantaneous (magnetic) trip, enabling immediate interruption when fault current reaches the magnetic threshold. As part of ABB’s S3L family, this breaker is designed for low‑voltage distribution and machine‑control applications where reliable three‑phase protection is required. The instantaneous trip function ensures rapid isolation of a faulted circuit, helping shield downstream equipment and wiring from damage and supporting coordination with upstream protective devices. This model, identified by the MWS4 suffix, represents the 3P 100A variant within the S3L lineup for ABB SACE systems. Intended for use in commercial and industrial electrical installations, it provides dependable protection for feeders and motor circuits, reducing the risk of damage from short circuits while enabling safe, predictable operation of downstream protection schemes. The S3L series is known for compact, robust construction suitable for panel mounting in control cabinets and distribution panels, aligning with ABB’s long‑standing emphasis on reliable electrical protection solutions for harsh industrial environments.