The ABB KT5S9 is a high-quality shunt trip accessory designed for seamless integration with T4-T6 circuit breakers. This field-installable unit operates on a 12VDC power supply, ensuring reliable performance in various electrical setups. The KT5S9 model is essential for enhancing circuit breaker functionality, allowing for remote tripping which is crucial for safety and operational efficiency. With a net and gross weight of 5.5792 ounces, this compact device is both lightweight and durable, making it an excellent choice for your electrical system needs.