Siemens 3RV1742-5ED10 Molded Case Circuit Breaker

Siemens 3RV1742-5ED10 Molded Case Circuit Breaker is a three‑pole, size S3 unit from the SIRIUS line designed for plant protection in industrial electrical systems. It is rated for 30 A and supports 347–480/600 VAC operation at 50/60 Hz, with a UL 489 listing and screw-terminal connections for main and control wiring. The device specifies an A‑trigger of 30 A and a N‑trigger of 390 A, aligning its main‑circuit protection with typical industrial protection schemes. Its front face is IP20 protected, and it offers an impulse voltage resistance of up to 6,000 V along with a mechanical switching life of about 50,000 cycles. Weighing roughly 4.85 lb, the breaker is suitable for installations up to 2,000 m above sea level and employs a secure screw‑terminal terminations. Manufactured by Siemens Furnas Electric Co, the 3RV1742-5ED10 is discontinued by the manufacturer, so current availability is generally through third‑party stock or remnants from distributors. This molded‑case breaker is intended for plant‑protection circuits where reliable three‑pole protection at higher voltages is required, delivering durable performance in industrial environments and compatible with standard Sirius protection schemes and UL 489 certifications.