The Siemens SENTRON 5SJ4206-8HG42 is a 2-pole miniature circuit breaker with a D tripping characteristic, rated 6 A at both 30 °C and 40 °C ambient. At 45 °C the rating derates to 5.8 A, at 50 °C to 5.7 A, at 55 °C to 5.6 A, and at 60 °C to 5.4 A; if the panel runs hot, factor that in for continuous load. Depth is 70 mm, height 121 mm. The breaker is sealable, halogen-free, and silicon-free — relevant for environments where outgassing or contamination must be minimised (e.g., food processing, medical device manufacturing). Touch protection is built in. Vibration resistance is rated at 50 m/s² over 25 to 150 Hz and 60 m/s² at 35 Hz (4 seconds), so it holds up on machinery with moderate vibration.
SENTRON miniature circuit breakers are specified in industrial control panels, distribution boards, and machinery — mechanical engineering and industry is the stated suitability. The D-curve and 6 A rating make it a fit for motor branch circuits, small transformer primaries, and other loads with a high inrush-to-running-current ratio. The 60 V DC maximum rating also allows use in some DC control circuits.