The AIRPAX/Sensata LELK1-1RS4-27129-920 is a hydraulic magnetic circuit protector offering low-cost power switching, reliable circuit protection, and accurate circuit control for a wide range of equipment. These protectors are suitable for applications requiring compliance with international standards like UL, CSA, and IEC. Available in single and multi-pole configurations, they provide flexibility for diverse circuit protection needs, including polyphase circuits and single-phase three-wire systems. The auxiliary switch option allows for mixing SELV and hazardous voltages, enhancing safety and control in complex electrical systems.