A test device for shaft sealing rings, having - a chamber housing, - a shaft sealing ring, - a shaft, - a bearing, in particular a ball bearing, - a support part, - a shaft part, rotatable by a motor, wherein the, in particular dynamic, shaft sealing ring, arranged on the shaft part, is received in the chamber housing, wherein the chamber housing is connected to the shaft in a rotationally-fixed manner, in particular is in one piece with the shaft, wherein the shaft is rotatably mounted by means of the bearing, wherein the bearing is received in the support part, wherein the shaft part is connected to the rotor shaft of an electric motor in a rotationally-fixed manner, wherein the rotor shaft is rotatably mounted relative to the support part by means of at least one further bearing, in particular a ball bearing, in particular wherein the further bearing is received in a housing part of the electric motor, which housing part is fixedly connected to the support part, in particular in a rotationally-fixed manner, characterised in that the test device has an electromagnetically actuatable brake, the shaft is connected to the electromagnetically actuatable brake, which is supported on the support part directly or by means of a torque supporting part, in particular wherein the shaft is connected to a first part of the electromagnetically actuatable brake in a rotatiorsally-fixed manner and a second part of the electromagnetically actuatable brake is connected to the support part directly or by means of a torque supporting part. having - a chamber housing, - a shaft sealing ring, - a shaft, - a bearing, in particular a ball bearing, - a support part, - a shaft part, rotatable by a motor, - a chamber housing, - a shaft sealing ring, - a shaft, - a bearing, in particular a ball bearing, - a support part, - a shaft part, rotatable by a motor, wherein the, in particular dynamic, shaft sealing ring, arranged on the shaft part, is received in the chamber housing, wherein the chamber housing is connected to the shaft in a rotationally-fixed manner, in particular is in one piece with the shaft, wherein the shaft is rotatably mounted by means of the bearing, wherein the bearing is received in the support part, wherein the shaft part is connected to the rotor shaft of an electric motor in a rotationally-fixed manner, wherein the rotor shaft is rotatably mounted relative to the support part by means of at least one further bearing, in particular a ball bearing, in particular wherein the further bearing is received in a housing part of the electric motor, which housing part is fixedly connected to the support part, in particular in a rotationally-fixed manner, characterised in that the test device has an electromagnetically actuatable brake, the shaft is connected to the electromagnetically actuatable brake, which is supported on the support part directly or by means of a torque supporting part, in particular wherein the shaft is connected to a first part of the electromagnetically actuatable brake in a rotatiorsally-fixed manner and a second part of the electromagnetically actuatable brake is connected to the support part directly or by means of a torque supporting part.