Semi-conductor soft starters

The SR33 semi-conductor soft starters are designed to control three-phase ac induction motors.

12/09/2011


The SR33 semi-conductor soft starters are designed to control three-phase AC induction motors. Courtesy: AutomationDirectThe Stellar SR33 Series basic soft starters are designed for general purpose applications where traditional across-the-line starting or wye-delta starting would typically be appropriate. The SR33 semi-conductor soft starters, available in 22 A to 482 A sizes, are suitable to control three-phase ac induction motors with a wide variety of motor loads. All units feature two-phase control, easily and separately adjustable motor start voltage and start and stop times, and depending on model, fault indication of 4 or 7 fault types: SCR or Power Supply, Overheat, Control Power Supply, Bypass Relay Failure, Shear pin, Overload, and Overcurrent. Ideal for applications such as pumps, blowers and conveyors, the SR33 series soft starters use thyristors for controlled reduced voltage motor starting and stopping, and then switch to internal contacts for efficient running at rated speed.

www.automationdirect.com 

AutomationDirect

- Edited by Chris Vavra, Control Engineering, www.controleng.com 



No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
Pump technology design: Selecting pumps and pipes; Class A office buildings; NFPA 101-2015; ASHRAE 90.1 updates; Motors, drives, and HVAC efficiency
Renewable power systems: Designing a net zero energy building; NFPA 37; Data center design; Lighting systems
Salary survey: How much are you worth?; Dedicated outdoor air systems; Energy models and lighting
Understanding transfer switch operation; Coordinating protective devices; Analyzing NEC 2014 changes; Cooling data centers
Designing positive-energy buildings; Ensuring power quality; Complying with NFPA 110; Minimizing arc flash hazards
Implementing microgrids: Controlling campus power generation; Understanding cogeneration systems; Evaluating UPS system efficiency; Driving data center PUE, efficiency
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.