Parts for low-voltage power circuit breaker lineups. Racking mechanisms, trip units, stabs, secondary disconnects, shutter assemblies, bus sections, cell hardware, and arc flash barriers. Current-production and legacy switchgear sourced. Exact nameplate data required.
This page covers individual components and replacement parts for low-voltage power circuit breaker switchgear. We source parts for current-production lineups and actively look for legacy switchgear components from discontinued series. What we don't do is supply complete medium-voltage or metal-clad switchgear lineups from this page, those are a different conversation that starts with your single-line and utility requirements.
The part sourcing process for switchgear is specific. A racking mechanism for an Eaton Magnum DS will not fit a Square D Masterpact NW. A trip unit from a Siemens WL-Series II won't swap with an older WL-Series I. Interchangeability between manufacturers essentially doesn't exist at the component level, and even within a manufacturer's lineup, frame size and vintage can matter. If you have photos of the nameplate and the affected area of the lineup, include them.
Parts are not interchangeable between manufacturers. Do not attempt to fit Eaton components into Square D lineups or vice versa, even when assemblies appear physically similar. Catalog number and series must match exactly. If you're unsure, send photos before ordering.
These are the component categories that come up most often. Not every component will be available for every series, and availability depends on what's in the market at the time of your inquiry.
The racking carriage that allows a breaker to be connected, disconnected, or placed in the test position. One of the more common mechanical failures in aging switchgear. Series-specific and not transferable between manufacturers or even between frame sizes within the same lineup.
Electronic trip units (ETUs) handle overcurrent, short-circuit, and ground fault functions. Older lineups may use separate protective relays rather than integrated trip units. ETU compatibility is tied to breaker frame and series. Replacements must match the original function and rating.
The plug-in connector assemblies that carry control power and signals between the breaker and the lineup cell. These wear over time and are a common cause of control circuit issues in older switchgear. Available for most major manufacturers.
The insulating shutters that close over the stab openings when a breaker is withdrawn from a cell. Required for arc flash safety and code compliance in most facilities. Replacement shutters must match the manufacturer's cell design exactly.
The primary disconnect stabs that connect to the lineup bus bars when a breaker is racked in. Stab condition affects connection resistance and heat generation. Cradle assemblies include the mechanical support and alignment structure within the cell.
Bus bar sections for lineup extension or replacement after fault damage. Arc flash barriers and insulating barriers that isolate sections of the lineup. Cell door hardware including latches, hinges, and interlocks. Availability for legacy lineups is variable.
These are the lineups currently in production. Manufacturer support is active and new parts are available through the supply chain, though some components still require sourcing lead time.
Eaton's primary low-voltage power circuit breaker platform. Frame sizes cover 800A through 6000A. Electronic trip units are the MicroLogic series (older frames) or the newer Eaton-designated ETU options. Racking mechanisms and secondary disconnects are the most frequently requested parts. The Magnum DS replaced the Magnum DS-III and Magnum SB; those are covered under legacy.
Schneider Electric's current low-voltage power circuit breaker lineup. The NW series handles the larger frame applications; the NT covers the lower frame range. MicroLogic trip units are field-replaceable within compatible frame groups. Door hardware and communication modules are common sourcing requests alongside the mechanical components.
Siemens' WL-Series low-voltage power circuit breaker. The WL replaced the earlier FD and RL breaker platforms in Siemens switchgear. ETU compatibility is tied to both the frame rating and the series variant. Parts for WL-Series I and WL-Series II are not fully interchangeable in all categories.
A significant amount of switchgear from discontinued series is still in service. Parts availability varies considerably by series and component type. Some items turn up through surplus channels regularly; others are genuinely difficult to locate.
General Electric's air circuit breaker switchgear that was heavily installed in industrial and utility applications from the 1970s through the early 2000s. GE Multilin protective devices appear in many of these lineups. Parts still come through surplus channels, particularly racking mechanisms and secondary disconnects.
ITE's K-Line switchgear was a well-installed platform in industrial facilities. The ITE brand was acquired and has passed through several ownership changes. K-Line parts are sourced entirely through surplus; new production doesn't exist. Finding components in good condition requires some patience.
Westinghouse switchgear was widely installed in the industrial and power generation sectors. The DS and DHP designations cover their draw-out power circuit breaker families. Westinghouse assets moved through various ownership transitions; parts for these lineups come from surplus stock. Condition varies significantly.
The more specific the request, the faster we can respond. A photo of the lineup nameplate and the affected component is often worth more than a paragraph of description. For legacy parts especially, model numbers and vintage can make the difference between finding a part and not.
If you're unsure of the exact component name, describe the function it serves and where in the lineup it's located. We'd rather spend a few extra minutes identifying the right part than send the wrong one.
Use the quote form and attach photos. For urgent situations, call directly. We'll get back to you with availability and condition.
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