Circuit arrangement for a turbocharger

Switch arrangement for a turbocharger (1) comprises a connecting line (3') between an exhaust gas outlet (3) of an internal combustion engine (2) and a feed channel (6) for exhaust gas. The turbocharger has an outlet (8) for the supplied exhaust gas, which is connected to a catalyst line (9) for feeding the exhaust gas to a catalyst (10). A switch device (12, 15, 17, 20) connected to the connecting line supplies exhaust gas directly via a line (16) to the catalyst or via the turbocharger. Preferred Features: A control device (19) provided for the switch device has at least one temperature sensor preferably arranged in the region of the catalyst.