SIMOVAC-AR™ arc-resistant and SIMOVAC™ non-arc-resistant medium-voltage controllers

Up to  6.9 kV, 720 A, up to 63 kA

Features and Benefits


Siemens expands ratings of arc-resistant SIMOVAC™ medium-voltage controller, improving safety and operation of critical electrical infrastructure technology. New 63 kA-rated SIMOVAC-AR™ controller rated for both short-circuit and internal arc-fault operations making it one of the industry’s most advanced medium-voltage controllers. SIMOCVAC-AR controller better protects operators and personnel against potentially dangerous arc-flash events and the extended ratings allow for most cost-effective and compact lineup of SIMOVAC-AR controllers and GM-SG-AR switchgear. Learn more about this story by clicking here.

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Siemens has provided medium-voltage controllers to users in the U.S., Canada, and around the world for construction, industrial, and utility projects for over 50 years. The Siemens SIMOVAC medium-voltage non-arc-resistant and SIMOVAC-AR arc-resistant controllers have a modular design incorporating up to two 400 A controllers, housed in a free-standing sheet steel enclosure. Each controller is NEMA class E2, equipped with three current-limiting fuses, a non-load-break isolating switch, and a fixed-mounted vacuum contactor (plug-in type optional for 400 A). The enclosure is designed for front access, allowing the equipment to be located with the rear of the equipment close to a non-combustible wall.

Types of Siemens SIMOVAC controllers include:

  • SIMOVAC non-arc-resistant medium-voltage controller

  • SIMOVAC-AR arc-resistant medium-voltage controller.

SIMOVAC Non-Arc-Resistant Medium-Voltage Controller

SIMOVAC-AR Arc-Resistant Medium-Voltage Controller

Features and Benefits

Features include:

  • Tested for arc-resistance to IEEE C37.20.7-2007, up to 63 kA, 0.5 s, accessibility type 2B

  • UL 347 5th edition/CSA C22.2 No. 253-09

  • 400 A bolt-in or stab-in (optional) or 720 A bolt-in vacuum contactor

  • 400 A or 720 A non-load-break isolation switch

  • 2.4 kV, 4.16 kV and 6.9 kV (up to 7.65 kV) system voltage ratings

  • 1,200 A, 2,000 A, 3,000 A or 4,000 A main bus with standard epoxy insulation on bus bars, and with optional boots for insulating joints

  • Tin- or silver-plated bus available

  • Front accessible

  • Main bus and ground bus are supported and braced to 63 kA two-second short-time capability

  • Top-mounted pressure relief channel shipped installed for reduced site installation time

  • Isolation switch with visible indication through viewing window to verify that the power cell is isolated from line-side source no need to open panel door

  • Isolation switch mechanically interlocked with the access door to prevent user access to primary compartment when isolation switch is closed

  • Low-voltage compartment is isolated from the medium-voltage compartment

  • All components are front accessible, facilitating routine inspection or parts replacement

  • Current-limiting fuses, contactor assembly and isolating switch assembly are easily removed from the enclosure

  • The main bus compartment is top, side and front accessible for easy installation and extension.

Arc-Resistant SIMOVAC-AR

The type SIMOVAC-AR equipment is classified as arc-resistant, as defined in ANSI/IEEE C37.20.7, and has been qualified in tests to carry a type 2B accessibility rating. These arc-resistant features provide an additional degree of protection to personnel in close proximity to the equipment in the event of an internal arcing fault while the equipment is operating under normal conditions. The enclosure withstands the pressures and elevated temperatures of an internal arcing fault and directs the hot gases and byproducts into the top-mounted pressure relief chamber (PRC). These arc by-products are then vented to the outside environment through an exhaust duct or plenum system.

SIMOVAC-AR Arc-Resistant Medium-Voltage Controller

Arc Venting for Standard SIMOVAC-AR Arc-Resistant MVC

Arc Venting for Standard Transistion SIMOVAC-AR Arc-Resistant MVC to GM-SG-AR Arc-Resistant MVS

Integrated Pressure Relief Channel for SIMOVAC-AR Arc-Resistant MVC and GM-SG-AR Arc-Resistant MVS Shown Installed in a Power Equipment Center

Transition Section SIMOVAC-AR Arc-Resistant MVC to GM-SG-AR Arc-Resistant MVS Shown Installed in a Power Equipment Center

Typical Motor and Feeder Applications

Typical motor and feeder applications:

  • Squirrel-cage induction motors (nonreversing, reversing, multi-speed or soft start)

  • Transformer feeder

  • Capacitor feeder

  • Power bus feeders (tie).

Typical Controller Types

Typical controller types:

  • Full-voltage non-reversing (FVNR)

  • Full-voltage reversing (FVR)

  • Latched contactor

  • Two-speed two winding (2S2W)

  • Two-speed one winding (2S1W)

  • Solid-state reduced-voltage (or soft start) starter (SSRVS).

Load-Interrupter Switch (LIS)

The photo shows the manually operated, single-throw, gang-operated, load-interrupter switch available in SIMOVAC and SIMOVAC-AR assemblies, rated either 600 A or 1,200 A. Quick-make, quick-break arcing blades combined with arc chutes provides positive, three-phase interruption of load currents. The switch uses a quick make/quick break stored-energy operator. The load-interrupter switch may be un-fused or equipped with current-limiting fuses to provide short-circuit current interrupting capacity. Fuses are mounted below the switch. The table below shows the ratings for the load interrupter switch.

The door and switch operating handle are mechanically interlocked to ensure the door cannot be opened with the switch closed and the switch cannot be closed with the door open. In addition, the switch is covered with a Lexan® barrier. The switches are fixed mounted and can be equipped with fixed-mounted fuses. Unfused switches or fused switches with fuses up to 900E will fit in a full height 36” (914.4 mm) wide section. 1100E and 1350E fuses require an additional 36” (914.4 mm) wide section.

Optional accessories for the load-interrupter switches include auxiliary contacts (2 NO and 2 NC), shunt trip or blown fuse indicator. The switch ratings are detailed in the table below.

Fused Load-Interrupter Switch (600 A)

Switch rating


Maximum voltage


Fused or unfused

Fault-making asymmetrical


Equivalent symmetrical









Fused (≤  600 E)





Fused (≤  300 E)










Fused  (≤  900 E)



01/31/2013 | Author: Name

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