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Multiple types of switchgear are available for switching and protecting circuits on utility distribution systems and within commercial and industrial (C&I) facilities. Although metal-clad switchgear and pre-engineered metal-enclosed switchgear are common choices, such switchgear creates challenges from an operations and maintenance (O&M) perspective or lacks the customization utilities or C&I facilities may need for specific application needs.

However, another customizable, low-maintenance, and robustly designed switchgear alternative exists to ease the challenges posed by metal-clad switchgear and pre-engineered metal-enclosed switchgear: S&C's Custom Metal-Enclosed Switchgear.

A Custom Solution

S&C’s Custom Metal-Enclosed Switchgear mitigates the challenges of metal-clad switchgear and pre-engineered metal-enclosed switchgear. Custom Metal-Enclosed Switchgear’s simple construction and installation requirements contribute to a low initial cost compared to metal-clad switchgear. Additionally, the product’s robust design makes it dependable, meaning it requires minimal maintenance over time—further reducing overall O&M costs. Designed to be a perfect fit for unique C&I or utility applications, Custom Metal-Enclosed Switchgear is the best choice to improve reliability.

The Benefits of Custom Metal-Enclosed Switchgear in Your C&I Facility

Product Overview

621 3 Bay Custom Metal-Enclosed Gear Unit

Custom Metal-Enclosed Switchgear incorporates interrupter switches and power fuses in durable enclosures and is tailored to meet specific indoor or outdoor distribution system needs. Available in ratings of 4.16 kV, 13.8 kV, 25 kV, 34.5 kV, and 46 kV, the switchgear is ideal for applications with unique requirements, such as uncommon switchgear bay layouts.

Advantages

Custom Metal-Enclosed Switchgear can be customized to fit your specific application requirements while reducing maintenance costs and improving reliability.

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Highly Customizable

Gear is configured to meet any system or application need

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Low Maintenance

Switches and fuses never need adjusting, programming, or dielectric testing

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Resilient Design

Utility-grade design withstands time and the elements

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Hassle-Free Installation

Preassembled and simpler construction requirements

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Lower Total Cost of Ownership

Lower up-front and maintenance costs than metal-clad switchgear

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Improved Reliability

Fuses offer faster fuse-clearing time and reduce system stress compared to circuit breakers

Features

Custom Metal-Enclosed Switchgear can be customized to fit your specific application requirements while reducing maintenance costs and improving reliability.

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Arc-Resistant Option

Operators and adjacent equipment protected from arc-flash events

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Lightweight Design

Easier transport, assembly, and installation

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Multiple Fuse Choices

Choose from S&C SM or SML Power Fuses or Fault Fiter® Electronic Power Fuses

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Single-Phase Load Protection

Fuses isolate only faulted phases of feeders

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Three-Phase Load Protection

Open-phase detection or overcurrent relays are available

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Sophisticated Source-Transfer Capabilities

Automatic power transfer from multiple sources

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Corrosion-Resistant Enclosure

Steel enclosure is protected against rain and corrosion using the state-of-the-art Ultradur® II Outdoor Finish

Case Studies

Featured customer successes achieved using Custom Metal-Enclosed Switchgear:

Flexibility and Custom-Design Expertise Provide Solution for National Laboratory

Read Case Study

S&C Designs Custom Metal-Enclosed Switchgear for Airport

Read Case Study

S&C Reduces Cost and Improves Safety at a Movie Studio

Read Case Study

Product Details

Custom Metal-Enclosed Switchgear is ideal for:

  • Complex automatic source-transfer schemes with two or more incoming power sources, multiple split-bus sections, or ring-bus arrangements
  • Applications with cold- or hot-sequence metering
  • Applications with special installation requirements, such as transformer primary unit substations, and those requiring special-purpose components, such as grounding switches, control power transformers, metering panels, or capacitors for power-factor correction
  • New or retrofit applications requiring uncommon switchgear layouts or having unique installation constraints, such as “U-shaped” configurations

(On mobile, swipe left for remaining ratings information.)

kV Amperes Components Short Circuit,
Amperes RMS, Sym.
Nom. Max BIL Main Bus Load
Dropping
Type Detail Amperes Max.
4.16 4.8 60 600 NA Fuse SM-4Z 200E 17 200
NA Fuse SM-40 400E 25 000
NA Fuse SM-5S 400E 37 500
NA Fuse Fault-Fiter 600 40 000
600 Switch Mini-Rupter 600 25 000
4.16 4.8 60 1200 NA Fuse SM-4Z 200E 17 200
NA Fuse SM-40 400E 25 000
NA Fuse SM-5S 400E 37 500
NA Fuse Parallel
SM-5S
720E 37 500
NA Fuse Fault-Fiter 600 40 000
NA Fuse Parallel
Fault-Fiter
1200 40 000
600 Switch Mini-Rupter 600 25 000
1200 Switch Alduti-Rupter 1200 38 125
13.8 17.0 95 600 NA Fuse SM-4Z 200E 12 500
NA Fuse SM-20 200E 14 000
NA Fuse SM-40 400E 25 000
NA Fuse SM-5S 400E 25 000
NA Fuse SM-5SS 400E 34 000
NA Fuse Fault-Fiter 600 40 000
600 Switch Mini-Rupter 600 25 000
13.8 17.0 95 1200 NA Fuse SM-4Z 200E 12 500
NA Fuse SM-20 200E 14 000
NA Fuse SM-40 400E 25 000
NA Fuse SM-5S 400E 25 000
NA Fuse Parallel
SM-5S
720E 25 000
NA Fuse SM-5SS 400E 34 000
NA Fuse Fault-Fiter 600 40 000
NA Fuse Parallel
Fault-Fiter
1200 40 000
600 Switch Mini-Rupter 600 25 000
1200 Switch Alduti-Rupter 1200 38 125
25 29■ 125 600 NA Fuse SM-4Z 200E 9 400▲
NA Fuse SM-20 200E 12 500
NA Fuse SM-5S 400E 20 000
NA Fuse SM-40 400E 20 000
NA Fuse Fault-Fiter 600 40 000
400 Switch Mini-Rupter 600 20 000
25 29 150 600 NA Fuse SM-4Z 200E 9 400▲
NA Fuse SM-5S 400E 20 000
NA Fuse SM-40 400E 20 000
NA Fuse Fault-Fiter 600 40 000
600 Switch Alduti-Rupter 600 17 500
25 29■ 125 1200 NA Fuse SM-4Z 200E 9 400▲
NA Fuse SM-20 200E 12 500
NA Fuse SM-5S 400E 20 000
NA Fuse SM-40 400E 20 000
NA Fuse Fault-Fiter 600 40 000
NA Fuse Parallel
Fault-Fiter
1200 40 000
400 Switch Mini-Rupter 600 20 000
1200 Switch Alduti-Rupter
(34.5 kV 1200 Amp)
1200 17 500
25 29■ 150 1200 NA Fuse SM-4Z 200E 9 400▲
NA Fuse SM-5S 400E 20 000
NA Fuse SM-40 400E 20 000
NA Fuse Fault-Fiter 600 40 000
NA Fuse Parallel
Fault-Fiter
1200 40 000
1200 Switch Alduti-Rupter
(34.5 kV 1200 Amp)
1200 17 500
34.5 38 150 600 NA Fuse SM-4Z 200E 6 250
NA Fuse SM-20 200E 8 450
NA Fuse SM-5S 300E 17 500
600 Switch Alduti-Rupter 600 17 500
34.5 38 200 600 NA Fuse SM-4Z 200E 6 250
NA Fuse SM-5S 300E 17 500
600 Switch Alduti-Rupter 600 17 500
34.5 38 150 1200 NA Fuse SM-4Z 200E 6 250
NA Fuse SM-20 200E 8 450
NA Fuse SM-5S 300E 17 500
1200 Switch Alduti-Rupter
(600 Amp)
600 17 500
1200 Switch Alduti-Rupter
(1200 Amp)
900 17 500
46 48.3 250 600 600 Switch Alduti-Rupter Switch 600 18 800
46 48.3 350 1200 1200 Interrupter Series 2000 Circuit Switcher 1200 40 000♦
46 48.3 350 600 NA Interrupter Trans-Rupter II® Transformer Protector 600 25 000
46 48.3 250 600 NA Fuse SMD-2C 300E 31 500

60-Hz Ratings

The ratings shown here are for individual bays. The rating for the entire assembly is the same as the lowest-rated bay. For 2000-A and 3000-A main-bus ratings, please contact S&C.

NA Not applicable.

Rating based on 4.16-kV refill. Rating is 27 000 amperes for a 7.2-kV refill.

■ The Max rating is reduced to 27 kV if using fuse types SM-4Z, SM-20, or SM-5S.

▲ Rating is 12 500 amperes on solidly grounded circuit with single-conductor concentric neutral cable or bus connection to transformer.

♦ This rating is for transformer switching and protection only. For other applications, short circuit rating is 25 000 amperes RMS, Sym.

The basic arrangements shown below are often combined to handle even the most complex distribution system needs. Other circuit designs are possible to fit specific needs. For example, Custom Metal-Enclosed Switchgear and Vista® Underground Distribution Switchgear modules can be combined to create System VI Switchgear


Radial System

radial-drawing.jpg

A radial system is the simplest system and is economical, permitting extensive use of dedicated radial circuits. The direct circuitry facilitates quick location and repair of faulted circuits. Segmentation of a distribution system with multiple radial circuits limits the extent of service interruption caused by faults. In this example, the service-entrance bay of the S&C’s Custom Metal-Enclosed Switchgear is provided with electronic power fuses to achieve full coordination with the upstream protective device.


Common-Bus Primary-Selective

common-bus-primary-selective-drawing.jpg

S&C’s Custom Metal-Enclosed Switchgear ensures a higher level of service continuity. Two utility sources—one source preferred the other alternate—supply power to the metal-enclosed switchgear. A power-operated interrupter switch for each source plus a source-transfer control affects the automatic two-way transfer in primary-selective switchgear. Interrupter switches with power fuses switch and protect the load circuits; in this example, two are manually operated.


Split-Bus Primary-Selective

split-bus-primary-selective-drawing.jpg

S&C’s Custom Metal-Enclosed Switchgear allows large in-plant systems to be supplied power through one switching center because both utility sources are fully used under normal operation, with the two source-interrupter switches closed and the bus-tie switch open. Each source, in effect, is the preferred source for its bus section and the alternate source for the other bus section.

Switches and Fuses

  • Mini-Rupter® Switch—rated through 600 amperes continuous and interrupting
  • Alduti-Rupter® Switch—rated through 1200 amperes continuous and interrupting are also available
  • Type SM-40 Power Fuse—rated 400 amperes max continuous (Other Type SM power fuses are available in ratings from 200 through 720 amperes max continuous. Fuses are offered in a wide variety of time-current characteristic (TCC) curves for optimal coordination and maximum protection. The TCC curves are precise and permanently accurate.)
  • Fault Fiter® Electronic Power Fuses—rated through 600 amperes max continuous (They have exceptional TCC versatility and higher continuous current ratings than previously available in fuses.)

Switch Operators and Controls

  • Type MS Switch Operators provide high-speed automatic Trip Open operation of Mini-Rupter Switches, and the interrupting time is 4 cycles. Type MS operators are available in a choice of manual or automatic Trip Closed operation.
  • Micro-AT® Source-Transfer Controls minimize interruptions resulting from the loss of one source, and transfer is achieved in as little as 20 to 25 cycles. Available with a wide choice of options.
  • Type ZSD Overcurrent Relays, applied on individual load feeders, provides three-phase isolation after a downstream fault has been detected and cleared. Superior to ordinary overcurrent relays, they can distinguish between fault current and transformer magnetizing inrush current.

Also available:

  • AS-30 Switch Operators for Alduti-Rupter Switches.
  • Open-Phase Detectors – Type SPD for protection of three-phase load circuits from open phase conditions.

 

Arc-resistant Custom Metal-Enclosed Switchgear is readily configured in circuit arrangements that make power system planning and design easy.

Combines the rugged features of Custom Metal-Enclosed Switchgear with additional measures needed to withstand the effects of internal arcing faults.

The enhanced design has successfully passed the rigorous certification testing required by Canadian Standard EEMAC G14.1. This standard addresses the effects of internal arcing fault conditions, including overpressure acting on covers, doors, and inspection windows. It also covers the thermal effects of the arc and verification the arc does not burn through external walls of the enclosure.

Ratings of Currently Available Arc-Resistant Switchgear Bays

kV Amperes, RM
Nominal Maximum BIL Continuous Short-Circuit, Symmetrical
4.16 – 13.8 17 95 600 40 000
25 29 125 600 20 000
34.5 38 150 600 17 500


See Photo Sheet 620-700 for more information.

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