ABB Stykače a nadproudová relé

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Vydal: ABB s.r.o, ELSYNN Autor: ABB ELSYnn

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Protection against: overload • phase failure imbalance • phase loss E fficiency rotection device current-dependent: Fuses O verload relays ith p rotection device in case phase failure P rotection device, tem perature-dependent: Therm istor m achine protection CUSTORAPID- Reasons for unwanted overloading of the motor winding 1 Current overloading 2 Rated duty types S1-S8 to IEC 34-I 3 Operation when starting, braking, reversing 4 Operation starting rates OOperating cycles ops./h D D D D 5 Locked motor In the case of motors with thermally critical rotor 6 Overload phase failure 7 Over-/undervoltage supply mains D D 8 Variation frequency supply mains D 9 Increased ambient temperature D 10 External heating of the motor (e. The specifications relation short-circuit protection for contactors and overload relays must noted when selecting the rating fuses circuit-breakers. For direct starting, fuses around 1.5 2. This would entail thermal overload the motor.3 tim its rated current for a sustained period. The following shows summary which facilitates the correct choice.g.Motor protection Selection the protection device Motor protection General aspects Selection adequate motor protection great importance with regard the operational reliability and service life motor. fuse must withstand 1.: bearing heating) D D 11 Obstruction otor cooling D Efficiency protection device: not effective ■ partly effective • fully effective Note fuses Fuses not protect motor against overload. S 2CDC 1GS 014 CG2G3 ABB STOTZ-KONTAKT GmbH . They serve only short-circuit protection switchgear and cables.5 tim the rated current should used. Since general rules exist, will gladly give you further advice spe­ cial cases such heavy starting. order protect motors against short-circuits, advisable use fuses aM conjunction with the thermal overload relay. The effectiveness the available motor protection devices depends the range application