The present disclosure provides a vacuum circuit breaker which can measure and monitor temperature of a tulip contactor, the vacuum circuit breaker comprising: a conductive pole including a tulip contactor; and a temperature detecting sensor disposed adjacent to the tulip contactor, wherein the temperature detecting sensor comprises: a sensor body; a fixing band coupled to the sensor body and disposed to surround a part of the conductive pole; and a temperature measurement part which comes into contact with a specific point of the tulip contactor to measure the temperature of the specific point, wherein a sensor insertion hole for accommodating a part of the temperature measurement part is recessedly formed at one surface of the tulip contactor facing the sensor body.

A set (40) of electrical switching contacts (1, 2) for a vacuum breaker (100) is proposed, comprising: a first contact (1), a second contact (2) movable along an axis of movement (A), each contact (1; 2) having the shape of a disc comprising a set of branches (5a, 5b, 5c; 6a, 6b, 6c) separated by a slot (7a, 7b, 7c; 8a, 8b, 8c) crossing the thickness of the disc, in which each branch (5a, 5b, 5c) of the first contact (1) and each branch (6a, 6b, 6c) of the second contact (2) comprises an inclined surface (9a, 9b, 9c; 10a, 10b, 10c), and in which the first contact (1) and the second contact (2) are angularly linked so that: the slots (7a, 7b, 7c) of the first contact (1) coincide with the slots (8a, 8b, 8c) of the second contact (2), and the inclined surface (9a, 9b, 9c) of one branch (5a, 5b, 5c) of the first contact (1) and the inclined surface (10a, 10b, 10c) of one branch (6a, 6b, 6c) of the second contact (2) are opposite to each other.