Frequency converter class comprising different types of frequency converters (1, 2, 3), - wherein a first type of frequency converters in the frequency converter class is composed of: - power electronics, - a carrier element and - a housing element of a first housing element type which, in combination with the carrier element, forms a housing for the power electronics, and - wherein a second type of frequency converters in the frequency converter class is composed of: - the power electronics, - the carrier element and - a housing element of a second housing element type which, in combination with the carrier element, forms a housing for the power electronics, characterized in that - the housing element of the first housing element type is designed such that the frequency converter of the first type has a first protection rating, - the housing element of the second housing element type is designed such that the frequency converter of the second type has a second protection rating, which is different from the first protection rating, and - there is a form-fit connection between the carrier element and the housing element of the first housing element type and between the carrier element and the housing element of the second housing element type, - wherein there is provision for a seal in the region of the form-fit connection, depending on the protection rating required. - wherein a first type of frequency converters in the frequency converter class is composed of: - power electronics, - a carrier element and - a housing element of a first housing element type which, in combination with the carrier element, forms a housing for the power electronics, and - wherein a second type of frequency converters in the frequency converter class is composed of: - the power electronics, - the carrier element and - a housing element of a second housing element type which, in combination with the carrier element, forms a housing for the power electronics, characterized in that - the housing element of the first housing element type is designed such that the frequency converter of the first type has a first protection rating, - the housing element of the second housing element type is designed such that the frequency converter of the second type has a second protection rating, which is different from the first protection rating, and - there is a form-fit connection between the carrier element and the housing element of the first housing element type and between the carrier element and the housing element of the second housing element type, - wherein there is provision for a seal in the region of the form-fit connection, depending on the protection rating required. - power electronics, - a carrier element and - a housing element of a first housing element type which, in combination with the carrier element, forms a housing for the power electronics, and - wherein a second type of frequency converters in the frequency converter class is composed of: - the power electronics, - the carrier element and - a housing element of a second housing element type which, in combination with the carrier element, forms a housing for the power electronics, characterized in that - the housing element of the first housing element type is designed such that the frequency converter of the first type has a first protection rating, - the housing element of the second housing element type is designed such that the frequency converter of the second type has a second protection rating, which is different from the first protection rating, and - there is a form-fit connection between the carrier element and the housing element of the first housing element type and between the carrier element and the housing element of the second housing element type, - wherein there is provision for a seal in the region of the form-fit connection, depending on the protection rating required. - the power electronics, - the carrier element and - a housing element of a second housing element type which, in combination with the carrier element, forms a housing for the power electronics, - the housing element of the first housing element type is designed such that the frequency converter of the first type has a first protection rating, - the housing element of the second housing element type is designed such that the frequency converter of the second type has a second protection rating, which is different from the first protection rating, and - there is a form-fit connection between the carrier element and the housing element of the first housing element type and between the carrier element and the housing element of the second housing element type, - wherein there is provision for a seal in the region of the form-fit connection, depending on the protection rating required.