What does EU and EL mean

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Procedure for the L9090EL/EU, L9091EL/EU, L9092EL/EU, L9093EL/EU, L9094EL/EU, L9095EL/EUThese devices have a selectable switch in the upper right corner of chassis.  Simply move the switch to ...
Procedure for the L9080EL/EU and L9082EL/EUTo modify an electrified L9000 from EU to EL or EL to EU move the link pin to the appropriate location indicated below in Figure 1.  
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...
Electrically locking and unlocking outside lever (inside and outside cylinders) - Outside lever continuously locked (EL) or unlocked (EU) by 12 or 24V DC. EL is fail safe (power failure allows out...
Electrically locking and unlocking outside lever (inside and outside cylinder with deadbolt) - Outside lever continuously locked (EL) or unlocked (EU) by 12 or 24V DC. EL is fail safe (power failur...