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Protection EquipmentOverload RelaysReference Manual March 2010Industrial ControlsSiemens 20102IntroductionOverload RelaysGeneral data3- Overview3RU1 Thermal Overload Relays3RU11 for standard applications7- Overview7- Design8- Function9- Technical specifications14- Characteristic curves15- Dimensional drawings16- Schematics17Accessories3RB2 Solid-State Overload Relays3RB20, 3RB21 for standard applications18- Overview18- Design19- Function20- Technical specifications25- Characteristic curves26- Dimensional drawings27- Schematics3RB22, 3RB23 for high-feature applications28- Overview29- Design30- Function32- Technical specifications37- Characteristic curves38- Dimensional drawings40- Schematics42AccessoriesProtection EquipmentProtection EquipmentIntroduction2Siemens 2010 Overview 1) The units are responsible in the main circuit for overload Protection of the assigned electrical loads (e.

Siemens · 2010 2 Introduction Overload Relays General data 3 - Overview 3RU1 Thermal Overload Relays 3RU11 for standard applications 7 - Overview 7 - Design 8 - Function

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