Inclusion Criteria:  Informed consent obtained before any trial-related activities. Trial-related activities are any procedures that are carried out as part of the trial, including activities to determine suitability for the trial. Male Chinese patient with severe congenital haemophilia A with a FVIII activity below 1% according to medical records. Aged greater than or equal to 12 years at the time of signing informed consent. History of at least 150 exposure days (EDs) to other FVIII products. The patient and/or caregiver is capable of assessing a bleeding episode, keeping a diary, performing home treatment of bleeding episodes and otherwise following the trial procedures at the discretion of the investigator.  Exclusion Criteria:  Known or suspected hypersensitivity to trial product or related products. Previous participation in this trial. Participation is defined as signed informed consent. Participation in any clinical trial of an approved or non-approved investigational medicinal product within 5 half-lives or 30 days from screening, whichever is longer. Known history of FVIII inhibitors based on existing medical records, laboratory report reviews and patient and/or caregiver interviews. Current FVIII inhibitors greater than or equal to 0.6 BU. Congenital or acquired coagulation disorder other than haemophilia According to medical records. HIV positive, defined by medical records, with CD4+ count less than or equal 200/L and a viral load greater than 200 particles/μl or greater than 400000 copies/mL within 6 months of the trial entry. If the data are not available in medical records within last 6 months, then the test must be performed at screening visit. Previous significant thromboembolic events (e.g. myocardial infarction, cerebrovascular disease or deep venous thrombosis) as defined by available medical records. Hepatic dysfunction defined as aspartate aminotransferase (AST) and/or alanine aminotransferase (ALT) greater than 3 times limit of normal combined with total bilirubin greater than 1.5 times the upper limit of normal at screening, as defined by central laboratory. Renal impairment defined as estimated glomerular filtration rate (eGFR) below or equal to 30 mL/min/1.73 m^2 for serum creatinine measured at screening, as defined by central laboratory. Platelet count below 50×109/L at screening based on central laboratory values at screening. Ongoing immune modulating or chemotherapeutic medication. Any disorder, except for conditions associated with haemophilia A, which in the investigator's opinion might jeopardise the patient's safety or compliance with the protocol. Mental incapacity, unwillingness or language barriers precluding adequate understanding or cooperation.