ORDER ONLINE or Call: 1-800-328-1842

Reconditioned General Electric Spectra Bus Plugs

July 19th, 2017 by

Looking for GE Spectra bus plugs? Look no further! EMSCO stocks both SB type and SL type plugs in both breaker and fusible styles. Each style has inventory in-stock from 30 amp up to 800 amp.

We have just recently received reconditioned SB366 & SB466 plugs and they’re going to go fast so call today! We also took delivery of new surplus SB466RG; in-stock and ready to ship today!

If interested, simply visit our website or call a salesman today! (1-800-328-1842)




New Shipment of Square D I-Line Bus Plugs

April 20th, 2017 by


Now in stock: EMSCO has received a large load of NEW in box Square D I-Line bus plugs. The new inventory includes a wide variety of sizes and plugs will fit both I-Line and I-Line II bus duct. This new inventory compliments our expansive inventory of reconditioned Square D I-Line bus plugs and largest inventory in existence of I-Line bus duct. If you have any questions and would like to speak to a salesman, simply give us a call at 1-800-328-1842.

The full breakdown of new (not reconditioned) bus plugs is as follows:

15 – PQ3610G

15 – PQ4610G

5 – PQ3620G

5 – PQ4620G

5 – PBQ3640G

5 – PBQ4640G

5 – PBQ3660G



A Brief Introduction to Motor Control Centers

January 19th, 2017 by

It’s been a little while since we’ve written an overview post highlighting one of our main product categories. We’ve covered a few different topics in the past — such as our introduction to bus plugs post — to highlight and provide some general information about the products and lines that EMSCO carries. In this latest post, we’ll be covering the basics of Motor Control Centers.

Basics of Motor Control Centers (MCC)

Motor control centers, at their most basic, contain a series of buckets housed in a larger structure. In industrial and manufacturing settings where electric motors are used, there needs to be a system to control such motors. That is where the motor control center comes in.

How they work

Feeder buckets are what power and control the electric motors. Generally, a single bucket controls a single motor. With most industrial processes using many electric motors, multiple buckets will be required to control the system. The structure, simply, is the vertical housing to hold and control all of the feeder buckets in one convenient central location.

The buckets inside the structure come in multiple sizes and configurations. For example, the buckets may either be fused or circuit breakers. The buckets themselves are also fully removable from the structure allowing flexibility for the electric system to adapt to changes in the industrial systems. For example, if additional motors are added or removed, additional buckets can simply be added or removed from the structure or swapped out for the correct components to be installed.

Need parts?

Looking to replace, upgrade, or install a new MCC system? Look no further. We have hundreds of vertical sections of motor control centers ranging from 400 amperes all the way to 3000 amperes, with main or main lug compartments. We have extensive stock in all the major brands including Square D, GE, Allen Bradley and much more. With thousands of buckets in stock in both fusible and breaker styles, from sizes 0-6, single and twin feeder buckets, EMSCO is sure to have what you need!


Since 1948, Electric Motor Supply Co. — EMSCO — is a leading dealer of used and refurbished industrial electrical systems and components. Our extensive inventory, housed in our 250,000 square foot warehouse in Minneapolis, MN, is sure to have the exact part you need. From over 25 miles of bus duct, thousands of bus plugs, to all kinds of transformers, circuit breakers and beyond, our experts will be happy to work with you with any of your electrical requirements.


Medium Voltage Switchgear

December 15th, 2016 by

EMSCO completes its latest medium voltage switchgear project. The latest project is an S&C 15KV line-up that includes a main lug only compartment and (5) 600amp fusible feeder switches.

EMSCO can handle all your medium voltage needs in a timely matter.

Contact us today.

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AC Pro / AC Pro II Trip Units

October 21st, 2016 by

You already know that EMSCO is the leading supplier of used, reconditioned and surplus industrial electrical equipment. But did you know that in addition to being the largest supplier that we also have the capability to fully customize our products to your specifications? Let’s talk quickly about one of our customization areas: trip units, specifically AC Pro and AC Pro II trip units.

The AC Pro / Pro II trip unit is a trip that we retrofit into many different brand molded case breakers. In fact, we retrofit this trip into all the major brands including GE, Square D, Eaton/Cutler-Hammer/Westinghouse, Siemens and more. We can customize these trip units to meet your amperage, voltage and function (LSIG) needs.The added benefit of the AC Pro and AC Pro II trip units is it allows us to gain flexibility on our huge stock of molded case circuit breakers to add ground fault to many breakers that do not currently have it.

The added benefit to you, our customer, is you that you have the confidence that your breaker has been fully tested with the addition of a brand new trip unit. And our quick turnaround allows us to get them installed and tested in just a few days.

The AC Pro and AC Pro II trip units work with the following brands and styles:

  • GE including Wave Pro, Power Break  and Power Break II Style Breakers
  • Square D including Master Pact, NX, SED/SEF Style breakers
  • Eaton Cutler Hammer/ Westinghouse including Magnum DS, PC, SPCB SCB, SPB Style breakers.
  • Siemens including SB, WL style breakers.

If you are looking for a molded case circuit breaker or looking for the addition of a trip unit, please give our sales team a call at 1-800-328-1842! We can be reached Monday – Friday from 8-5 central time.

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