They normally have no actual locking mechanism, they connect and disconnect because of tension or stress. Pantograph isolators are normally used in trains as they obtain electricity from the overhead transmission lines. A double break type isolator can be operated with a handle (manual operation) or using a motor (automatic), Pantograph Isolator In a double break isolator, both terminals break and make because the central terminal is movable. Manual operation is also normally an option but only in the event of an emergency. Single break isolators are generally operated by a motor or mechanism that moves the male contact to disconnect the circuit. Only one terminal connects and disconnects in a single break isolator as one contact is movable. The arm contacts move because of the rotation from a fixed point where the arm contacts have been fixed. The first arm of a single break isolator has a male contact located on it and the second arm has a female contact on it.
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