3RU1146-4MB0

Product Description

It is built in size S3 for direct mounting on SIRIUS contactors such as 3RT1044, 3RT1045 and 3RT1046, uses screw terminals on both main and auxiliary circuits, and provides 1 NO + 1 NC auxiliary contacts with manual or automatic reset, TEST function, STOP button and switching position indication. Rated for operational voltages up to 1000 V, it is a standard motor protection component in heavy industry, mining and infrastructure. We supply original Siemens SIRIUS protection devices worldwide. The Siemens 3RU1146-4MB0 is a SIRIUS thermal overload relay with an adjustable setting range of 80 to 100 A and trip class 10, designed for the protection of three-phase motors against overload and phase failure.

Basic Product Information

• Direct mounting on SIRIUS size S3 contactors (3RT1044 / 3RT1045 / 3RT1046)
• Manual and automatic reset, TEST function, STOP button and trip indication
• 1 NO + 1 NC auxiliary contacts for trip signaling and contactor drop-out
• Screw terminals on main and auxiliary circuits, rated up to 1000 V
• Adjustable current range 80-100 A for motor protection, trip class 10

Technical Specifications

Version & Model Difference

Within the 3RU1146 size S3 family, several setting ranges are offered (the suffix letter codes the range: e.g. -4EB0 for 22-32 A up to -4MB0 for 80-100 A). The 3RU1146-4MB0 is the 80-100 A version with manual/automatic reset. Stand-alone mounting kits and electronic alternatives (3RB series) are available for other requirements.

Application Scenarios

• Overload and phase-failure protection of three-phase motors from 80 to 100 A
• Motor feeders in mining, cement, steel and water treatment plants
• Protection of pumps, fans, compressors and conveyor drives in size S3 starters