The ABB ESB25-40N series are compact installation contactors designed for DIN-rail mounting in electrical distribution systems. These contactors are used to switch and control single-phase and three-phase electrical loads up to 25 A. They support AC or DC control voltages and are suitable for both household and industrial environments. The design offers hum-free operation, low power consumption, and integrated overvoltage protection, making them reliable for general load switching applications.