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Siemens 3RH19211KA02 - Auxiliary Switch Block 2NC (500V, IP20)

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Siemens 3RH19211KA02 is an auxiliary switch block from the SIRIUS series, designed to provide reliable switching for motor contactors and contactor relays. This component features 2 normally closed (NC) contacts across 2 poles, with a rated insulation voltage of 500 V and an electrical endurance of 200,000 switching cycles at AC-15, 230 V. The switch block mounts laterally on contactors sized S3 to S12 using a 10 mm screw terminal connection, offers IP20 protection on the front, and weighs 5.19 lb. It conforms to EN 50005 standards and delivers a mechanical service life of up to 10 million switching cycles with a contact reliability of 1 fault per 100 million operations. Typical industrial applications include use in motor control centers and automation systems requiring high switching reliability and durability.

Key Features & Specifications
  • Manufacturer: Siemens
  • Product Brand: SIRIUS
  • Auxiliary Contacts: 2 Normally Closed (NC)
  • Poles: 2
  • Mounting Type: Second lateral, EN 50005 standard
  • Connection Type: 10 mm screw terminal
  • Size Compatibility: S3 to S12 contactors
  • Protection Class: IP20 (front)
  • Insulation Voltage: 500 V
  • Mechanical Service Life: 10,000,000 switching cycles
  • Electrical Endurance: 200,000 switching cycles at AC-15, 230 V
  • Contact Reliability: 1 fault per 100 million switching operations
  • Weight: 5.19 lb


3RH19211KA02