what does el and eu mean?

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EL: Electrically Locked (Fail Safe), locks when power is supplied and is unlocked when there is no power. EU: Electrically Unlocked (Fail Secure), unlocks when power is supplied and is locked when...
The ND electrified motor driven locks shipping as of  March 14, 2016 has a field selectable operating mode, you can convert from EL to EU or EU to EL by flipping a switch on the chas...
The electrified ND electrified solenoid driven lock shipped prior to March 14, 2016 can be converted between fail safe (EL) and fail secure (EU) by swapping out the solenoid, sleeve,...