The SMC-3 solid-state soft starter by Allen Bradley is low voltage, compact, and cost-effective Smart Motor Controller that features true three phase control, for superior speed control and a smoother, safer motor start-up and stop. The SMC-3 includes overload protection, integral bypass, and motor and system diagnostics to provide you with a flexible electrical motor control solution which reduces downtime and improves productivity.

The embedded bypass automatically closes when the motor has reached full speed to minimise heat generation. For fast diagnostics the SMC-3 also features a Hold To Test/Push To Reset button, which detects faults and enables the device to be reset. The LED display provides immediate status indication and assists with troubleshooting. Due to its convenient compact size this device uses less panel space and offers ease-of-installation. DIP switches ensure that set-up is efficient and secure, as they allow setting of the START/STOP profile, built-in overload, connection type, trip class and auxiliary contact characteristics.

Integration of the SMC-3 in your electrical motor control system results in less stress/shock to mechanical components due to decreased start-up torque, helping to extend the lifespan of your equipment. It protects against machine damage as line and motor diagnostics detect single-phase conditions. System maintenance is reduced due to lower peak currents during start-up, which lowers operating costs.

Allen Bradley offer a range of smart motor starters that will ensure reliable high performance and precision, giving you a long-lasting solution for your application.

• Quick, easy installation due to simple user interface
• Includes built-in silicon-controlled rectifier (SCR) bypass/run contactor
• Provides 3 to 480 A current range to suit your requirements
• Uses rated voltage: 200…690V AC, 50/60 Hz
• Includes five start and stop modes
• Provides embedded programmable electronic motor overload protection (DIP switch selectable - Trip class 10, 15 or 20)
• Includes a hold-to-test/push-to-reset button to allow fault finding and simple reset, reducing downtime
• Simplified and secure set-up using DIP switches
• Programming via Connected Components Workbench™ software
• Designed for full integration with the Allen-Bradley MCS range

Pumps
Conveyors
Fans
Lifts
Mixers
Chillers

Additional Information:
Frame size 1: 45mm wide, 3 phase control facilitating true soft start capability up to 20kW
Frame size 2: 72mm wide, 3 phase control facilitating true soft start capability up to 45kW
Seven ratings covering 3A to 37A
Phase rotation checking
Two control voltage ratings: 418-6934 24Vac/dc and 418-6861 100V to 240Vac. 50/60Hz over to 0 to 40°C
DIP switch-selectable starting methods (soft start 2 to 15 seconds, current limit, kick-start) and stopping methods (soft stop 100%, 200% or 300% of start time, coast to rest)

kW ratings based on current limit value of 350%. Product should always be selected by Motor Full Load Current

The SMC-3 150-C37NBD motor controller has a line voltage of 480 V 60Hz and current rating of 37A, and a control voltage of 100 to 240V ac. It has a power rating of 18.5kW.

A soft starter is a type of motor starter which is often used to control AC electric motors. It is used during a machine start-up process to manage the speed and torque of the motor and prevent electrical surges (inrush currents). It achieves this by gradually and safely increasing the voltage until the machine is running at full speed. Solid-state switches can be used in this type of starter to regulate the voltage, as well as the starting current supplied. These devices are useful for the protection of electrical motors against damage and from heating caused by recurrent starts and stops, and can extend its service life. They are a simple, economical solution which is often used in industrial applications such as conveyors, pumps, and fans.

Soft starters were developed to overcome the drawbacks of direct on line (DOL) and star-delta starting of single and three phase a.c. induction motors, such as high starting currents, voltage peaks and mechanical snatch. Allen Bradley motor starters provide advantages such as energy saving through reduced peak kVA, reduced starting torque, prolonged equipment life, minimised voltage dip problems, allowing minimum cable conductor size, and elimination of high current transients; when a 3-phase motor changes from Star to Delta.