Siemens 3RU1136-4DB0 Overload Relay 18-25 Amp with 3RT1033-1A Contactor

The Siemens 3RU1136-4DB0 is a thermal overload relay designed for motor protection, paired with the 3RT1033-1A contactor to form a compact motor starter assembly. This combination provides reliable overload protection for three-phase motors in industrial applications such as conveyor systems, pumps, and fans. The overload relay features adjustable current settings from 18 to 25 amps, with Class 10 tripping characteristics for quick response to overload conditions, preventing motor damage from excessive heat. It includes manual and automatic reset options, phase failure sensitivity, and test functions for easy maintenance. The 3RT1033-1A contactor is a 3-pole AC contactor with a 110-120V coil, offering high switching capacity and durability in harsh environments. Benefits include easy DIN rail mounting, compact design reducing panel space, and integration with Siemens SIRIUS control systems for enhanced automation. Advantages over competitors like ABB or Schneider include superior build quality, longer service life (up to 10 million operations), and better compatibility with IEC standards. Drawbacks may include higher initial cost and the need for specific Siemens accessories for expansions. Based on image analysis, the unit appears used but in good condition, with no visible damage, and includes attached components like a potential monitoring relay and circuit breakers, suggesting it's part of a larger control assembly. Applications span manufacturing, HVAC, and water treatment industries.