Low-voltage motor control centers

tiastar low-voltage motor control centers lineup

tiastar™ motor control centers

Siemens tiastar industrial motor control centers (MCC) combine time-proven designs and components with the latest in technological advances to meet most applications. No matter how customized your needs may be, you can be assured that you are getting a finished product that represents the state-of-the-art in low-voltage motor control technology.

tiastar MCC options

Standard non-arc-resistant MCCs

Standard non-arc-resistant

tiastar standard MCCs

Siemens tiastar standard MCCs are designed as self-contained modular units which meet UL and NEMA standards. They come with rear-mounted, self-aligning copper stabs that firmly grasp onto the bus. Brackets guide the placement of units, further assuring positive engagement with the bus. From 22 mm to 30 mm pilot devices, from direct starters to world-class drives, Siemens tiastar standard MCCs have features and options to meet many specific needs. Other options include SIERS integrated electrical-racking system via retractable stabs and Sm@rtGear power distribution solution.
  • UL 845 labeling as applicable
  • CSA C22.2 No. 254-05 labeling as applicable when specified
  • Heavy-duty construction with up to 100 kA bus bracing
  • Up to 600 V 50/60 Hz
  • NEMA wiring 
  • Plug-in units (up to size 5 starters)
  • Door/unit-mounted pilot-device panel
  • High-density compact units available to reduce footprint.

Learn more about tiastar standard MCCs.

Smart MCCs


tiastar smart MCCs

Siemens smart MCCs are networked, NEMA compliant MCCs that can communicate. They incorporates intelligent devices at the unit level to control and monitor motor operation, energy consumption, and power quality. Smart MCCs rapidly communicate with programmable logic controllers (PLCs) or process control systems via a data network.
Smart MCCs are internally interconnected using communication protocols which incorporate intelligent devices such as SIMOCODE pro motor management systems, SIRIUS 3RW44 soft starters, SIMATIC PLCs, Siemens variable-frequency drives (VFDs), and other smart components.  Sm@rtGear power distribution solution is also optionally available.
  • Reduces wiring connections
  • Improves operational diagnostics
  • Simplifies installation and troubleshooting.

Learn more about tiastar smart MCCs.

Arc-resistant MCCs

Arc resistant

tiastar arc-resistant MCCs

Siemens type 2A arc-resistant, low-voltage motor control centers are tested in accordance to IEEE C37.20.7, which contains and channels internal arcing fault incident energy. They provide an additional degree of protection to the personnel performing normal operating duties in close proximity to the equipment while the equipment is operating under normal conditions. Type 2A accessibility means the MCCs protect the operator in front, back, and sides of the equipment.
Siemens tiastar arc-resistant MCCs showcase state-of-art overarching technology. This means one can get an arc-resistant MCC that can have various smart components with communications, and/or high-density compact units. Other options include SIERS integrated electrical-racking system via retractable stabs and Sm@rtGear power distribution solution.
  • Automatic shutters
  • Reinforced doors
  • Insulated bus bar
  • Bolted wireway
  • Internal venting system
  • Deflectors
  • Modified pull-box with pressure flap.

Learn more about tiastar arc-resistant MCCs.

Aftermarket and replacement

Aftermarket and replacement

Aftermarket and replacement

Siemens supports a full line of replacement components, renewal parts, and aftermarket units to maintain the value and use of existing tiastar and previous generation motor control centers.

Learn more about aftermarket and replacement components, parts, and units. 

Standard catalog offering

Standard catalog offering

Standard catalog offering

The cataloged standard structures and units offering includes the most popular configurations and enables them to be ordered by standard part numbers. These standard catalog structures will include:

  • Fixed-mounted feeder circuit breaker
  • Blank section, 
  • Mounting panel,
  • Main lug only
  • Main circuit breaker vertical sections.

The standard catalog units will include common plug-in:

  • Full-voltage, non-reversing (FVNR)
  • Feeder circuit breaker (FCB) units. 

In addition, Siemens also offers other standard options, such as pilot-device kits.


Learn more about the motor control center standard catalog offering.

MCC supporting documentation

Supporting documentation

Click here to view supporting documentation, such as flyers, brochures, installation guides, instruction manuals, white papers, specifications, certifications, and wiring diagrams for tiastar low-voltage motor control centers.

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Have a technical or application question? Check out Siemens TechTopics, which is a series of papers that discuss issues of interest to users or specifiers of electrical equipment. Click here to go to TechTopics.

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Improving electrical safety by design

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Mailing address

Siemens Industry, Inc.

7000 Siemens Road

Wendell, North Carolina 27591

United States of America