"🔹 Siemens 3RU2126-1KB0 Thermal Overload Relay Size: S0 Setting Range: 9 – 12.5 A Motor Power: 4 kW / 5.5 HP Application: Motor protection Description (EN): The Siemens 3RU2126-1KB0 thermal overload relay offers precise protection for motors operating in the 9 – 12.5 ampere range. Designed to be used with contactors of size S0, this reliable relay protects motors with a power rating of up to 4 kW (5.5 HP) against phase failure, overload, and unbalanced currents. It ensures high operational reliability and quick trip response, making it ideal for general industrial applications. Features: - Adjustable setting range: 9 – 12.5 A - Compatible with Siemens 3RT contactors (Size S0) - Manual and automatic reset functions - Phase failure sensitivity - Compact DIN rail mountable design"