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Capacity Duty Contactors CEM_CN

Capacity Duty Contactors CEM_CN
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£TI Capacitor duty contactors Contactors for capacitor banks CEM CN Application Contactors for capacitor switching were specially designed for power factor correction capacitor operation (utilization category AC-6b). Capacitors are pre-charged through resistors that reduce the peak current to the contactor when CEM_CN special contactors are switched on. After the pre-charge, the main contactors close allowing passage of rated current. Advantages - Mounting on DIN rails and on mounting plates - Technical specification according to IEC 60947-4 - Built-in pre-charge resistors - High reliability - Reduced dimensions - Standard control voltage 230V AC Capacitor duty contactor CEM_CN Operating principle: When capacitor bank being switched on, the capacitors are uncharged and the system sees them as a short circuit for a quick period of time. The in-rush current is the result of this little short circuit and usually lasts for some milliseconds. It may reach 100 times the rated current, being one of the main reasons for the short life of a capacitor. The CEM CN contactor is assembled with damping resistors which limit the high in-rush current when the capacitors are switched on. They are assembled with and early-make contact block, which is switched on before the main contacts, thus, limiting the in-rush current. However, the damping resistors don't influence the final load, since they are switched off after 5 milliseconds, leaving only the capacitors in parallel with your inductive load, providing the proper power factor correction. This process increases the lifetime of the capacitors and also prevents net distortions.

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Capacitor duty contactors en Capacitor duty contactor CEM CN ( 230 V 50/60 Hz) 15 25 30 Voltage(V)/ rated power (kVAr) AC-6b (t° = 55°C) 34 50 62 67 Recommended max. fuse (gL/gG) Tightening torque 1,6 ... 3 2,5 ... 4 4 ... 6 4 ... 6 5 ... 6,5 Max electrical operating frequency op/h* Auxiliary contacts built-in Electrical lifespan Dimensions (W/H/D) Code No. Weight 004649140 004650140 345 345 619 619 670 1370 1389 1700 *Accessories (aux. contacts for CEM18CN - CEM80CN and other accessories) can be found in ETICON, page 212 **Recharge time should not be less than 1 minute Auxiliary contact...

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