AC Motor Soft Starters

Compact 3-Phase Soft Starters
(SR22 Series, 5A - 40A)
Basic 3-Phase reduced voltage Soft Starters
(SR33 Series, 22A - 482A)
Full-Featured 3-Phase Soft Starters
(SR44 Series, 9A - 370A)

Applications for AC Soft Start Motor Controllers

General purpose soft start motor control applications where traditional across-the-line starting or wye-delta starting would typically be appropriate. Typical application types include:

Agitator
Air Compressor
Ball Mill
Centrifuge
Chiller
Conveyor
Crusher
Escalator
Fan (Low and High Inertia)
Feeder
Grinder
Hammer Mill
Lathe Machine
Mills (Flour, etc.)

Mixer (Unloaded or Loaded)
Pelletizer
Plastic and Textile Machines
Press (Flywheel)
Pump (Centrifugal)
Pump (Positive Displacement)
Rolling Mill
Saw (Band)
Saw (Circular)
Screen (Vibrating)
Transformer
Tumbler
Wood Chipper

STELLAR Soft Starters, Motor Soft Starters,

STELLAR SR Series 3-Phase Motor Soft Starters

	Compact 3-Phase Soft Starters (SR22 Series, 5A - 40A) The SR22 series motor soft starters use thyristors for controlled reduced voltage motor starting and stopping. These low voltage soft starters then switch to internal contacts for efficient running at the rated speed. 5-40A @ 208-460V 24 VDC control voltage 3- Phase (two-phases controlled) Internal bypass contacts for run Error and Run LEDs DIN rail mounting Two standard-size widths: 45mm & 55mm Six error/trip indications: AC Supply, Control Supply, Overheated, Bypass Failure, Shear Pin, Overcurrent UL listed* (E333109) (optional fans are UL recognized: E132139, E77551, E89936, CE, RoHS) Accessories: Cooling fan (increases # of motor soft starts/hour) Compact AC motor soft starter prices start at $119.00* (SR22-05) STELLAR™ SR22 Series AC Motor Soft Starters Overview

	Basic 3-Phase Soft Starters (SR33 Series, 22A - 482A) SR33 semi-conductor solid state soft starters provide many advantages when used instead of electro-mechanical contactors to control 3-phase AC induction motors, and are designed to fit in place of existing wye-delta starters. 22-482A @ 208-460V 24 VDC or 115 VAC I/O 24 VDC control voltage 3-Phase (two-phases controlled) Internal bypass contacts for run Designed to replace wye/delta starters Fault indication of 4 or 7 fault types, depending upon model: SCR or Power Supply, Overheat, Control Power Supply, Bypass Relay Failure, Shearpin, Overload, Overcurrent CE, UL E333109 listed (soft starters SR33-350 to SR33-482 are not UL listed or recognized) Accessories: Heat-shrink insulation kit SR33-HS1 Basic AC motor soft starter prices start at *$455.00* (SR33-22) STELLAR™ SR33 Series AC Motor Soft Starters Overview

	Full-Featured 3-Phase Soft Starters (SR44 Series, 9A - 370A) SR44 series solid state starters have an Automatic Application Setup that fully configures the motor soft starter for a specific application with one entry. SR44 series motor starters also have a built-in "Optimizing" mode that reduces energy costs when used on lightly loaded and oversized AC motors, and external bypass capability for efficient running at rated speed. 9�370A @ 230�460VAC (suitable for use on 208V systems) 115 or 230 VAC selectable control voltage Fully programmable, full three-phase motor control External bypass capability for run Can be connected �in-the-delta�, allowing use of a smaller soft starter Can be used for motor reversing (with external contactors) Keypad: 6 buttons with 2-line, 32-character display Programmable I/O for remote/PLC-based control IP20, panel mount, CE, REACH, RoHS listed UL (cULus E333109) listed (Options SR44-KPD & SR44-RS485 are not UL approved) Accessories: Communication/Modbus card SR44-RS485, Remote keypad SR44-KPD (requires SR44-RS485) Full-featured AC motor soft starter prices start at *$735.00* (SR44-9) STELLAR™ SR44 Series AC Motor Soft Starters Overview

AC Motor Soft Starter Selection / Sizing Charts

Our SR22 Series Sizing Chart contains 3 easy steps to properly size your motor compact soft starter based on horsepower, voltage, and starting class
The SR33 Series Sizing Chart contains steps to properly size SR33 basic soft starters.
The SR44 Series Sizing Chart contains steps to properly size SR44 full-featured soft starters.

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