New SR55 Series Full-Featured 3-Phase Soft Starters (17 to 477A)

STELLAR SR55 Series
Full-Featured 3-Phase Soft Starters

Fully digital SR55 series three-phase AC motor soft starters are available in three frame sizes with 24VDC, 110 or 230 VAC selectable control voltages and are designed for 17 to 477 full-load amps (at 200-480 VAC). SR55 soft starters provide full motor overload protection and built-in SCR failure protection. SR55s are ideal in applications requiring lower inrush currents and have a built-in internal bypass and patented iERS (intelligent Energy Recovery System) that reduces energy costs. The fully programmable units have a built-in touchscreen for application set up and monitoring and also feature integrated Modbus RTU with optional Modbus TCP or Ethernet/IP for communications as well as programmable analog and digital I/O for remote control. Starting at $975.00 with a two-year warranty, the SR55 series soft starters are UL listed, CE, REACH, and RoHS approved.

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Full Featured AC Motor Soft Starters - SR55 Series    
STELLAR® SR55 Series Full-Featured 3-Phase Soft Starters (17A - 477A) ... New!

• 17A to 477A rated current versions @ 200 - 460 VAC 
  
• Frame Size 1: 17A - 96A
  
• Frame Size 2: 124A - 180A
  
• Frame Size 3: 242A - 477A
  
  

SR55 full-featured solid-state Soft Starters provide many advantages when used instead of electromechanical contactors to control 3-phase AC induction motors.

• SR55 soft starters are fully digital, and use thyristors in all three motor phases for controlled reduced voltage motor starting and stopping.
  
• SR55 series starters have an Automatic Application Setup that fully configures the starter for a specific application with one entry. 
  
• And the SR55 series has a built-in internal bypass and patented iERS (intelligent Energy Recovery System) that reduces energy costs when used on lightly loaded and oversized motors. 
  
• Full-featured SR55 series soft starter prices start at $975.00 (SR55-017)
  
  

Applications

• General purpose applications where traditional across-the-line starting or wye-delta starting would typically be appropriate
• Applications with oversized or lightly loaded motors (iERS reduces energy usage)
  
• Applications requiring lower inrush currents
  

SR55 Sizing Chart  
(properly size SR55 full-featured soft starters)


Features

• 17-477A @ 200-480VAC
• 24VDC, 110VAC, or 230VAC selectable control voltage
• Internally bypassed during run
• Full three-phase motor control
• Built-in SCR failure protection
• Full motor overload protection
• Full data logging (fault records, motor current, operational status, etc.)
• Fully programmable
• Easily and separately adjustable motor start and stop times
• iERS (intelligent Energy Recovery System) saves energy on lightly-loaded motors
• Can be connected 'in-the-delta', allowing use of a smaller Soft Starter (no iERS optimizing with in-delta connections)
• Can be used for motor reversing (with external contactors)
• Suitable for a wide variety of motor loads
• Touchscreen with easy-to-navigate menu structure and quick automatic application set up
• Can be used with local or remote control
• Integrated Modbus RTU, or optional Modbus TCP or EtherNet/IP communication
• Optional remote touchscreen available
• Programmable analog I/O, digital inputs, and relay outputs for remote control
• Fault record history of last 10 trips (using the download fault log will give faults and running data for the life of the SR55)
• IP20, panel mount with optional finger guards for frame sizes 1 and 2 soft starters
• Two-year warranty
• CE, ETL (CSA C22.2 No.14 and UL 508), REACH, RoHS
  

Full-Featured AC Motor Soft Starters Overview [PDF]


Mechanical Advantages

• Smaller physical size than equivalent SR44 models (even with the built-in bypass contactors)
• Smooth acceleration; reduced mechanical shock and starting stress
• Extend lifespan of mechanical drive-train components
• Fluid couplings and some clutches can be eliminated
  

Electrical Advantages

• Reduced starting currents and spikes
• More motors or larger motors can be started from lower-capacity power sources
• Allows motors to be started more frequently
  

Economic Advantages

• Lower overall costs for new installations
• Reduced maintenance and replacement of mechanical drive-train components
• Reduced starting current lowers demand charges
• iERS (intelligent Energy Recovery System) reduces electrical power costs
• Automatic Application setup feature speeds installation by configuring the SR55 for a specific application with one setting
  

Optional Soft Starter Accessories

• EtherNet/IP communication module
• Modbus TCP communication module
• Modbus serial communication splitter
• RJ12 to RJ45 adapter
• Power terminal IP20 finger guards
• Remote touchscreen
• Replacement touchscreen
• Replacement cooling fans