THREE PHASE, ZERO CROSS SCR Power Control


The term Zero-Cross SCR's are turned on only when the instantaneous value of the sinusoidal wave is zero.  Power is applied for a number of continuous half-cycles and then removed for a number of half-cycles.  The frequency of the on-off cycles can be extremely fast because there is no limit to the number of switching operations the SCR can perform.  The following models are suited for applications with Three Phase, Zero-Cross requirements.

TWO LEG CONTROLLERS
MODEL VOLTAGE CURRENT COMMAND
FEATURES
APPROVAL
3020
Specs
120 to 575 10 to 40 & 70 4/20mA Compact, 4/20mA Loop powered UL Listed
3021A
Specs
120 to 575 10 to 40 & 70 Most Commands Compact UL Listed
3021B 120 to 575 10 to 40 & 70 Most Commands Compact, Sync-Guard UL Listed
3023 120 to 575 10 to 40 & 70 4/20mA Compact, Time Proportioned, 4/20mA Loop powered UL Listed
3024
Specs
120 to 575 10 to 40 & 70 3 to 32 Vdc Compact UL Listed
3024A
Specs
120 to 575 10 to 40 & 70 90 to 280 Vac Compact UL Listed
3027
Specs
120 to 575 85 to 1000 Most Commands Sync-Guard, Trans-Guard UL Listed to 425 Amps
3031 120 to 575 10 to 40 & 70 1 to 5 Vdc & Pot. Compact UL Listed
3037
Specs
208 to 575 85 to 750 Most Commands Shorted SCR Detection UL Listed to 425 Amps

THREE LEG CONTROLLERS

MODEL VOLTAGE CURRENT COMMAND FEATURES APPROVAL
3320 120 to 575 10 to 40 & 70 4/20mA Compact, 4/20mA Loop powered UL Listed
3321A 120 to 575 10 to 40 & 70 Most Commands Compact UL Listed
3324 120 to 575 10 to 40 & 70 3 to 32 Vdc Compact UL Listed
3337 208 to 575 200 to 600 Most Commands Shorted SCR Detection -
Single Phase, Phase Angle       Single Phase, Zero Cross
Three Phase, Phase Angle       Special Controllers & Accessories
DIN-Pak Solid State Relay

McGoff-Bethune, Inc.
5970 Unity Drive Suite A
Norcross, GA 30071
770-840-9811    800-303-4705     Fax: 770-840-7514
McGoff-Bethune, Inc.
5970 Unity Drive Suite A
Norcross, GA 30071
770-840-9811    800-303-4705     Fax: 770-840-7514
sales@mcgoff-bethune.com
 www.mcgoff-bethune.com