The 4230-T120-K0DE-2A is a single-pole thermal-magnetic miniature circuit breaker designed for DIN rail mounting with toggle actuation and high rupture capacity in accordance with EN 60947-2, UL 1077, and UL 489 standards. This device features a positively trip-free snap action mechanism with screw terminals rated for 20 A at AC 240 V, supporting cable cross-sections up to 35 mm² with a maximum tightening torque of 2 Nm. The breaker operates reliably across an ambient temperature range of -35°C to +70°C, with IP20 degree of protection, overvoltage category III (Uimp 4 kV), and pollution degree 3 insulation coordination. It is commonly used for protection of cables, motors, generators, transformers, and industrial control systems, offering reliable switching behavior and a wide range of trip characteristics suitable for diverse applications.