🔹 Siemens 3RU2146-4KB0 Thermal Overload Relay Size: S3 Setting Range: 57 – 75 A Motor Power: 37 kW / 50 HP Application: Motor protection Description (EN): The Siemens 3RU2146-4KB0 thermal overload relay offers precise protection for motors operating in the 57 – 75 ampere range. Designed to be used with contactors of size S3, this reliable relay protects motors with a power rating of up to 37 kW (50 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: 57 – 75 A - Compatible with Siemens 3RT contactors (Size S3) - Manual and automatic reset functions - Phase failure sensitivity - Compact DIN rail mountable design