PLEASE NOTE: Effective 2019, we no longer supply Control Techniques variable frequency drives and components. We have drives from several other manufacturers which can meet or exceed the performance characteristics of the Control Techniques line. Simply complete the form below, or contact us with the model of your current or obsolete Control Techniques drive and we’ll be glad to identify a suitable replacement.

Also, the Fincor and Saftronics lines of AC variable frequency drives, DC variable speed drives, and reduced voltage starters were once owned by Emerson but have been obsolete for several years. However, we have many years’ experience working with these drives and can quickly identify replacements capable of exceeding the quality and performance of these older drive technologies. For a suitable replacement, fill out the form below or contact us with your drive or application requirements, and we’ll handle it from there!

Commander SK

Go to Control Techniques, Solutions Through Innovation

Simplicity with Function

Obsolete Drive Replacement RFQ -

If you need a replacement for an existing obsolete drive, complete the following form and we will send you a quote for a suitable replacement.

* Required

Is an encoder or tachometer being used for speed feedback to the drive?:
Opt-In to our e-mail list:

Power Accessories


Dynamic braking resistors provide a means of rapidly decelerating or stopping the motor and load. The mechanical energy stored in the spinning mass is converted into electrical energy by the drive and then quickly dissipated into the resistor, (See Power Accessories section for braking resistor ratings and model numbers)

INTERNAL EMC FILTERCommander SK Internal EMC Filter

An internal EMC filter is provided as standard with the Commander SK which is adequate for most industrial applications. The drive and filter conforms to EN61800- 3 (second environ- L ment). For installations where it is deemed necessary, Control Techniques provide a range of addition external EMC filters. The internal filter can be easily removed if the drive is to be used on IT supplies or with low earth leakage external EMC Footprint filters.


EMC filters are used to minimize high frequency power supply line disturbances caused by PWM AC drives that may interfere with proper operation of sensitive electronic equipment. These specific filters have been assessed for conformance with the EMC directive by testing with the appropriate Control Techniques drives. Commander SK 2 Mounting Styles in One


The Commander SK EMC filters are designed such that they can be mounted in either of two orientations.

  • Bookend: filter mounts next to the drive with the smallest dimension being the width of the filter
  • Footprint: filter mounts between the drive heatsink and the panel or enclosure
EMC Filter Description  Voltage Order Code
SK-EMC Filter Size A 1 Phase 200 to 240V +/- 10% 1ph 4200-6122
SK-EMC Filter Size B 1 Phase 200 to 240V +/- 10% 1 ph 4200-6212
SK-EMC Filter Size B 3 Phase 380 to 480V +/- 10% 3ph 4200-6213
SK-EMC Filter Size C 1 Phase 200 to 240V +/- 10% 1 ph 4200-6310
SK-EMC Filter Size C 3 Phase 380 to 480V +/- 10% 3ph 4200-6311
EMC Filters for low earth leaking applications Voltage Order Code
SK-EMC Low Leakage Size A 200 to 240V +/- 10% 1 ph 4200-6122
SK-EMC Low Leakage Size B 200 to 240V +/- 10% 1 ph 4200-6212
SK-EMC Low Leakage Size C 380 to 480V +/- 10% 3ph 4200-6213

Information provided by Control Techniques, a world leader in the design, production and marketing of electronic drives for the control of electric motors.