A PTC heating module for heating a fluid, - wherein the PTC heating module comprises at least one cuboid PTC thermistor with two main sides (3a, 3b) opposite each other, which are spaced apart and define a thermistor thickness (D PTC) of the PTC thermistor; - wherein the PTC heating module comprises two contact plates (4a, 4b), between which the respective PTC thermistor is arranged and with which the respective PTC thermistor is electrically contacted; - wherein the PTC heating module comprises at least one contact socket (5a, 5b) with a contact side (6a, 6b), the contact socket (5a, 5b) resting on one side electrically conductively with its contact side (6a, 6b) against the one main side (3a, 3b) of the respective PTC thermistor and on the other side resting electrically conductively against the one contact plate (4a, 4b); - wherein a geometric contact surface (F K,A, F K,B) between the main side (3a, 3b) of the respective PTC thermistor and the contact side (6a, 6b) of the at least one contact socket (5a, 5b) is smaller than a geometric surface (F PTC) of the main side (3a, 3b) of the respective PTC thermistor; - wherein, due to a thickness (D S) of the at least one contact socket (5a, 5b) a distance between the one contact plate (4a, 4b) and the other contact plate (4a, 4b) is enlarged, - so that a clearance distance from the one contact plate (4a, 4b) to the other contact plate (4a, 4b) and a creapage distance from the at least one contact socket (5a, 5b) to the other contact plate (4a, 4b) is larger than the thermistor thickness (D PTC) of the PTC thermistor, characterized in that a geometric surface of the respective contact plate (4a, 4b) is larger than the geometric surface of the main side (3a, 3b) of the respective PTC thermistor. - wherein the PTC heating module comprises at least one cuboid PTC thermistor with two main sides (3a, 3b) opposite each other, which are spaced apart and define a thermistor thickness (D PTC) of the PTC thermistor; - wherein the PTC heating module comprises two contact plates (4a, 4b), between which the respective PTC thermistor is arranged and with which the respective PTC thermistor is electrically contacted; - wherein the PTC heating module comprises at least one contact socket (5a, 5b) with a contact side (6a, 6b), the contact socket (5a, 5b) resting on one side electrically conductively with its contact side (6a, 6b) against the one main side (3a, 3b) of the respective PTC thermistor and on the other side resting electrically conductively against the one contact plate (4a, 4b); - wherein a geometric contact surface (F K,A, F K,B) between the main side (3a, 3b) of the respective PTC thermistor and the contact side (6a, 6b) of the at least one contact socket (5a, 5b) is smaller than a geometric surface (F PTC) of the main side (3a, 3b) of the respective PTC thermistor; - wherein, due to a thickness (D S) of the at least one contact socket (5a, 5b) a distance between the one contact plate (4a, 4b) and the other contact plate (4a, 4b) is enlarged, - so that a clearance distance from the one contact plate (4a, 4b) to the other contact plate (4a, 4b) and a creapage distance from the at least one contact socket (5a, 5b) to the other contact plate (4a, 4b) is larger than the thermistor thickness (D PTC) of the PTC thermistor,