The 4230-T120-K0CU-15A is a single-pole thermal-magnetic miniature circuit breaker designed for DIN rail mounting with toggle actuation and visual status indication. It is rated for AC 240 V at 15 A and features screw terminals with a maximum cable cross-section of 35 mm² and a tightening torque of 2 Nm. The device incorporates a positively trip-free snap action mechanism for reliable switching behavior and meets IEC/EN 60947-2 and UL 1077 standards with an insulation coordination of overvoltage category III (Uimp 4 kV) and pollution degree 3. It operates reliably across an ambient temperature range of -35°C to +70°C and provides IP20 degree of protection. Common applications include protection of cables, motors, generators, transformers, and industrial process control systems, offering high rupture capacity and robust performance in demanding electrical environments.