New Yorker Electronics is now distributing United Chemi-Con’s longest life version in its U37 grade series, U37X screw terminal aluminum capacitor. The U37 is specifically designed to provide the ripple current capability and long life required for high reliability inverter applications, such as in UPS devices and servo press machines where higher capacity is required.
The United Chemi-Con U37X provides capacitance ranges of 1,200 µF to 18,000 µF and voltage ranges from 350 V DC to 500 V DC. It has a rated lifetime of 15,000 hours at 85° C with rated ripple current applied. The category temperature range is 40° C to 85° C. Its leakage current is 0.02 CV (µA) or 5 mA, whichever is smaller, after five minutes at 25° C, with a standard capacitance tolerance of -20%. The nominal case size is a diameter of 50 mm (2.000 in) to 89 mm (3.500 in) with length options of 92 mm (3.625 in) to 219 mm (8.625 in).
Screw connection types are ideal for inverter and speed controller applications where high ripple currents can occur. The U37X has an endurance rating of 15,000 hours at 85° C with the rated ripple current applied but according to UCC, useful life can exceed 175,000 hours at 40° C and 2.1 times the ripple current. Voltage ranges from 6.3 V to 700 V make serial capacitor arrangements obsolete.
The full line of UCC U37 screw connection types offer very high capacities in the range of over 2 uF at ambient temperatures up to 105° C. This enables high operating temperatures without any loss of the specified service life. These capacitors are also available in a variety of high-current terminals in both English and metric threads. Mounting options include a three-footed clamp or bottom threaded stud and custom designs are available.