Safety switch that may be locked with an electromagnet

A safety switch comprising:

• a housing in which is housed an electrical contact block;
• a control head attached to the housing to such a way that it may be rotated to different positions around a first axis and which has at least one slot for inserting a switch actuator, a push rod which moves parallel to the first axis and a transmission mechanism fitted with a roller which can rotate around a second axis, perpendicular to the first axis, to move the push rod according to the movement of the actuator;
• an electromagnet housed in the housing with a core which moves in a third axis that is parallel to the first axis and which co-operates with a blocking element which is configured to block the push rod, when the push rod is in a disengaged position;
• and
• a locking device interposed between the electromagnet and the blocking element wherein the locking device can be moved between a first position and a second position;
• wherein the first position corresponds to a configuration where the locking device urges the blocking element to block the push rod when the electromagnet is supplied with power, and wherein the second position corresponds to a configuration where the blocking element urges the blocking member to block the push rod when the electromagnet is not supplied with power.