The 3120-N321-P7T1-W01D-20A is a thermal circuit breaker combining overcurrent protection and ON/OFF switching functionality in a single component. It features 2-pole switching with 1-pole thermal protection using a thermobimetal trip element, rated for 20 A at AC 240 V with a snap-in mounting design (44.5 × 22 mm cut-out). The device operates across a temperature range of -30°C to +60°C with temperature-dependent trip characteristics, and includes blade terminals (6.3 × 0.8 mm) for reliable electrical connection. Its positively trip-free mechanism ensures reliable circuit disconnection even with the actuator blocked, making it ideal for overload protection of motors, pumps, transformers, and cables in medical equipment, laboratory apparatus, machine construction, and household appliances.