Large con­tac­tors sim­plify con­trol, im­prove en­ergy ef­fi­ciency

DEMM Engineering & Manufacturing - - PRODUCT WATCH -

Rock­well Au­to­ma­tion has re­leased the Allen-Bradley Bul­letin 100-E IEC con­tac­tors to help ma­chine builders de­sign smaller, more en­ergy-ef­fi­cient pan­els.

The man­u­fac­turer says that tra­di­tion­ally, con­tac­tors have been used to switch elec­tri­cal loads in nu­mer­ous ap­pli­ca­tions, such as mo­tors, fans and pumps. How­ever, large size con­tac­tors are in­creas­ingly used in ap­pli­ca­tions to iso­late or by­pass these loads and for switch­ing of re­sis­tive loads. To ac­com­mo­date this change, new lines of con­tac­tors fea­ture a uni­ver­sal coil, which of­fers op­er­a­tors more flex­i­bil­ity when con­trol­ling with mul­ti­ple volt­ages.

“Typ­i­cally, with con­tac­tors, you need to spec­ify what volt­age you want to con­trol with,” said Si­mon John­son, tech­ni­cal con­sul­tant – Con­nected Com­po­nents, Rock­well Au­to­ma­tion. “With the new lines, the con­tac­tors can be con­trolled with 40 to 50 dif­fer­ent volt­ages, rang­ing from 24 to 500 volts, with only four dif­fer­ent coil op­tions.”

Pre­vi­ous op­tions were avail­able in mul­ti­ple volt­ages and of­ten re­quired an AC or DC coil to con­trol ap­pli­ca­tions. With the in­tro­duc­tion of the uni­ver­sal coil, op­er­a­tors can more eas­ily con­trol volt­age on mul­ti­ple ap­pli­ca­tions with fewer parts.

“These coils are also much more en­ergy ef­fi­cient,” said John­son. “With the new de­vice, op­er­a­tors can op­er­ate the same ap­pli­ca­tions with a smaller power sup­ply.”

In ad­di­tion to the uni­ver­sal coil, the new con­tac­tors are sig­nif­i­cantly smaller than pre­vi­ous prod­uct lines. The Bul­letin 100-E IEC con­tac­tors have a 25 per­cent smaller foot­print than pre­vi­ous prod­uct lines.

“The new con­tac­tors are smaller in size than pre­vi­ous lines,” said Robert Camp­bell, com­mer­cial spe­cial­ist – Power Con­trol & Con­nected Com­po­nents, Rock­well Au­to­ma­tion. “A more com­pact con­tac­tor al­lows for a smaller panel and a smaller en­clo­sure.”

The new con­tac­tors re­place the Allen-Bradley Bul­letin 100-D IEC con­tac­tors. While the pre­vi­ous line fea­tured con­tac­tors for ap­pli­ca­tions from 115-860 amps, the new con­tac­tors are de­signed for ap­pli­ca­tions from 116 to 2650 amps.

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