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 . <EOS>