ABB S403M Miniature Circuit Breaker, 3-Pole, 20 A, Type D, 12 V ac AC, 400 V dc DC, 10 kA Breaking Capacity

This is an MCB designed to provide reliable overcurrent protection in commercial and industrial settings. The S403M-D20 operates with a current rating of 20A and features a 3-pole configuration. Its thermal electromechanical tripping mechanism ensures effective overload and short circuit protection. This DIN Rail Circuit Breaker measures 54mm in width and 75mm in length, making it suitable for various circuit setups.

• Trip characteristics are compliant with Type D standards for high inrush currents

• Utilised for overload protection in commercial installations

The tripping mechanism utilises a combination of thermal and electromechanical methods. The thermal component provides delayed tripping for overloads, whereas the electromechanical aspect responds rapidly to short circuits, ensuring comprehensive protection.

The rated operational voltages indicate that the device can function effectively between 12V and 440V AC. This range ensures its compatibility with various electrical systems, from low-voltage applications to standard industrial mains.

The breaking capacity of this circuit breaker is rated at 10 kA at both 230V and 400 V. This high capacity is suitable for demanding environments where short circuit conditions may occur, ensuring the safety of connected circuits.

Wiring should use screw terminals capable of accommodating flexible conductors of 0.75 to 25 mm² and rigid conductors of 0.75 to 35 mm². Adhering to these specifications will ensure secure connections and optimal electrical performance.