Siemens SIRIUS 3RV Motor Protection Circuit Breaker

The Siemens SIRIUS 3RV motor protection circuit breaker is the combined motor protection and switching device that replaces the separate MCCB or fuse plus overload relay in direct-on-line motor starter circuits — consolidating short-circuit protection, thermal overload protection, and manual on/off switching into a single DIN-rail or contactor-mounted device rated for 0.1 A to 100 A across four frame sizes (3RV2011, 3RV2021, 3RV2031, 3RV2041). The 3RV's thermal-magnetic trip mechanism provides Class 10 (IEC 60947-4-1) thermal overload protection against sustained overloads, with a continuously adjustable current setting dial that allows the field electrician to match the relay precisely to the motor's nameplate full-load current — unlike fixed-rating fuses that require stocking multiple fuse values. The magnetic instantaneous trip provides short-circuit clearing at currents from 7× to 14× the current setting depending on the 3RV type, and the breaking capacity reaches 100 kA at 415 V AC in the 3RV2031 and 3RV2041 sizes, covering the fault current levels encountered at busbars of industrial MCCs supplied by large distribution transformers in Saudi Arabia.

The 3RV's defining integration feature is its direct-clip-on mounting interface with Siemens SIRIUS 3RT contactors: the 3RV mounts directly onto the base of the corresponding 3RT contactor without separate mounting hardware, and the main current path passes through the mechanical interface — eliminating the separate wiring run from the breaker to the contactor that conventional circuit breaker and contactor combinations require. The 3RV also provides auxiliary contacts (1 NO + 1 NC) for remote tripped-status monitoring in PLC-controlled motor starter panels, and the integral hand-wheel operator on the 3RV2031 and 3RV2041 allows the motor starter to be isolated manually from the front panel without a separate isolating switch. Alarm signalling contact add-ons and remote operator accessories extend the 3RV into motor management system architectures where trip events must be reported to a centralised maintenance management platform.

In Saudi Arabia, the SIRIUS 3RV is the standard motor protection circuit breaker in SIRIUS direct-on-line motor starter assemblies throughout ARAMCO refinery and utility MCCs, SABIC petrochemical plant motor control centres, NWC water pumping station panels, and industrial MCCs across MODON industrial estates in Riyadh, Jeddah, and Dammam. The 3RV's direct mounting to the 3RT contactor and 3RU overload relay direct-mount alternative makes it the essential component for Siemens SIRIUS motor starter modules assembled by SEC-approved panel builders in the Kingdom. For motors above 45 kW where an overload relay is preferred over a motor protection circuit breaker, the 3RV provides the main circuit short-circuit protection function with a 3RT contactor and 3RU2 overload relay completing the starter assembly.

Razz Middle East stocks SIRIUS 3RV motor protection circuit breakers across the full 0.1 A to 100 A range in all four frame sizes for immediate delivery to panel builders, industrial contractors, and maintenance teams throughout Saudi Arabia. We provide 4-hour RFQ response with SAR pricing and same-day dispatch from our local warehouse.