Rack-mount, wall-mount or free-standing?

The electronics do the same job in every enclosure. The choice comes down to where the load is, how much current it draws, and how close to the load you want the protection to sit.

Configure a switch Talk to engineering

10–200 Arack-mount, 1U to 4U

10–200 Awall-mount

100–600 Afree-standing

Choose by where the load is

Rack-mountLives in the same rack as the equipment it protects and uses the A and B feeds already there. No new conduit, and it moves with the equipment when the floor plan changes. A failure affects one rack. Choose it for IT, network, telecom and control racks.

Wall-mountFor rooms without racks: mechanical galleries, control houses, security closets, beside a CDU or a pump skid. Hardwired, 10 to 120 A three phase or up to 200 A single phase.

Free-standingA floor cabinet for distribution-level loads from 100 to 600 A. It feeds a panel, a PDU or a large single load. Everything downstream shares the switch, so it covers more load with one unit and protects less of the path.

Current range by enclosure

Move the slider to a current rating to see which families offer it.

Point of use or central?

Protection extends only upstream of the switch. A central static switch in the electrical room cannot help with a panel, breaker or feeder that fails after it, and most of the distribution in a facility (panels, breakers, feeders and PDUs) sits downstream of that point. When a central switch fails, every rack behind it feels it at once. A rack-mount or wall-mount switch at the load covers the whole path and limits the exposure to the load it serves.

Large switches still have their place: big single loads, distribution to equipment that is already dual-corded, and sites where point-of-use units are impractical. Many facilities use both.

Implementation Rack-mount families Wall-mount families

Side by side

	Rack-mount	Wall-mount	Free-standing
Families	DCC-I, DCC-II, DCC-III, DCC-4-R, DCC-4-R4	DCC-4-W, DCC-4-W4	DCC-4-S
Current	10 to 200 A	10 to 200 A	100 to 600 A
Phase	Single and three phase	Three phase	Three phase
Typical location	Equipment rack, 1U to 4U	Mechanical room, control house, closet	Electrical room or end of row
Exposure if it fails	One rack	One load or panel	Everything downstream
Service under load	Bypass isolation or hot-swap with maintenance bypass	Maintenance bypass	Maintenance bypass

Questions engineers ask

Can a wall-mount switch feed a rack?

Yes. It is a good answer when the rack has no spare space or the load is three-phase and above 50 A.

Is there a rack-mount switch above 120 A?

Not in three phase: above 120 A the free-standing DCC-4-S runs from 100 to 600 A. In single phase, the rack-mount DCC-4-R4 goes to 200 A.

Does the enclosure change transfer performance?

No. All TwinSource static switches transfer as fast as a quarter cycle.

Put it to work

Narrow the range to your voltage, current and mounting, or send us your one-line diagram and talk to an engineer.

Open the configurator Request quote