APC SRTRK2 Rail Kit Compatibility for Your UPS and Rack

APC SRTRK2 is the rail kit Schneider Electric lists for Smart-UPS SRT 5 kVA, 6 kVA, 8 kVA and 10 kVA systems. The official product page identifies it as a 19-inch rail kit and says the package includes an installation guide and mounting hardware. That is the starting point, not a blanket fit promise for every UPS carrying "SRT" on its front panel. The chassis model, the way it is being mounted, and the distance between the rack's front and rear posts still matter.

Before requesting a quote, photograph the UPS nameplate and the rack posts. Record the full UPS model, suffix and voltage version; whether the unit is a tower being converted or a rack model replacing missing hardware; and the cabinet's usable front-to-rear post spacing. The buyer's question is not simply "does this rail kit fit APC?" It is "does this exact kit fit this exact chassis and the rack in which it must sit?"

SRTRK2 and SURTRK2 are different part numbers

The most consequential trap is one extra letter. SRTRK2, without a U after the S, is the Smart-UPS SRT kit covered here. Schneider's current listing for SURTRK2, with a U, names a different Smart-UPS RT 19-inch rail kit and a different capacity family. The two codes are visually close enough to be confused in a used-parts listing, a copied title, or a purchase order. A search result matching "TRK2" alone does not establish a match.

Read the code from the UPS manual and from the rail-kit label. Do not infer that one can replace the other because both listings say APC, Smart-UPS, or 19-inch. Check the complete model printed on the UPS itself; a family nickname or VA rating recalled from memory is not enough. If a seller's title says SRTRK2 but its product data, label photo, or invoice says SURTRK2, stop and resolve the discrepancy before paying.

Check whether the UPS model uses this rail kit

Schneider's SRTRK2 product page lists Smart-UPS SRT 5/6/8/10 kVA systems. The separate tower-to-rack conversion guide is titled for SRTRK2 and organises hardware by chassis group: SRT5K, SRT6K, and SRT8K/SRT10K. In that guide, those groups correspond to 3U, 4U, and 6U configurations respectively. This model-specific split matters when a seller offers a loose hardware bag or a partial kit: a picture of rails alone cannot show that the brackets, cleats and fasteners match the chassis you own.

Use the compatibility statement as a shortlist, then confirm the complete model in its current installation manual or Schneider's product selector. A 5 kVA number on an older Smart-UPS RT is not the same as an SRT 5 kVA model. Likewise, regional letters and product suffixes can distinguish otherwise similar units. If you are moving a unit from tower to rack, confirm the manual explicitly supports that conversion and calls for SRTRK2; this is a chassis conversion, not just a way to attach front rack ears.

A 19-inch rack still needs the right post layout

SRTRK2 is a rack kit for a 19-inch installation. Schneider's depth FAQ groups SRTRK2 with its four-post rail kits. That means the rack needs front and rear mounting posts for the kit's support path. A two-post telecom rack, a wall cabinet with only front rails, or a shelf-only arrangement is a different mounting problem. Do not assume the four-post kit becomes a two-post kit because the front brackets line up.

Measure between the rack's vertical mounting surfaces where the rail brackets actually attach, not the outside depth of the cabinet. Rack depth labels often describe the enclosure shell; they do not tell you the usable distance between front and rear posts after doors, cable channels and post adjustment are accounted for. Photograph the rack's hole pattern and note whether its posts are square, threaded or another type. The rail manual and included hardware determine how the connection is made.

What the 36-inch figure does and does not tell you

Schneider's FAQ says the listed rail kits can be physically extended up to 36 inches (91.44 cm). The same answer cautions that vertical rack-post tolerances may require adjusting the posts for proper fit, and tells buyers to consult the NetShelter installation manual or the third-party cabinet maker. Treat 36 inches as an upper physical extension stated for the listed rail family. It is not a complete minimum-to-maximum fit chart for every rack, and it does not certify that your chassis, cable bend radius, rear access or cabinet doors will clear.

Measure the actual front-to-rear post spacing at the intended U position. Compare it with the current SRTRK2 instruction sheet and the cabinet maker's usable rail range. If the rack sits close to the stated maximum, or the post spacing cannot be adjusted, get the exact minimum and allowable span confirmed in writing before ordering. The product page's listed dimensions, 4.4 cm high, 52.7 cm wide and 8.9 cm deep, describe the kit's physical dimensions. They are not a substitute for the installed rail's adjustment range or your rack's post-to-post measurement.

Plan for the installed load and the conversion task

A rail kit is light compared with the UPS it supports, so do not use the kit's 2.73 kg net weight as a clue to the load the rack must carry. Schneider's SRTRK2 guide warns that the equipment is heavy and states that each battery module weighs 17 kg; it tells installers to use safe lifting techniques and remove battery modules before installing the UPS. That 17 kg figure is for a battery module, not the complete UPS or battery pack. Check the exact operating weight of each chassis in its own manual, then make sure the rack and its mounting position are rated for the combined equipment.

If an external battery pack will sit in the rack with the UPS, identify that pack's model separately. The SRTRK2 guide groups some hardware by UPS size and refers to external battery packs as well, so a loose or used kit may not include every component needed for both enclosures. Ask the distributor to confirm the contents for the complete planned layout. Installation handling and support are part of fit: a kit that lines up with the posts is not adequate if the rack load limit or the required hardware is unresolved.

Check the mounting job, not only the box label

A rail kit can be incomplete even when the two long steel pieces look right. The SRTRK2 guide separates hardware for SRT5K, SRT6K and SRT8K/SRT10K units; it also shows kit components beyond the rails. A used set should be compared with the parts diagram for the UPS it came from. If the source model is unknown, a photo of the rails alone cannot establish that its cleats, brackets and fasteners match your chassis.

Work out what is actually missing before buying a replacement. A lost standard rack screw may not call for a full rail kit. But a front rack ear is not a substitute for rear support on a long chassis, and a shelf does not automatically provide the retention shown in the UPS manual. Use the manual to identify the intended support path first; the thread and cage-nut question is a separate problem from whether the rail system itself belongs to the unit and rack.

Treat rail dimensions and cabinet depth as separate checks

The catalogue dimensions help identify the box and estimate storage space. Schneider lists the kit at 4.4 cm high, 52.7 cm wide and 8.9 cm deep; the net kit weight is 2.73 kg. Those figures do not tell you the distance between the rack's front and rear mounting surfaces. In particular, do not treat the listed 52.7 cm width as the cabinet depth or the adjustable span of the installed rails.

Measure the rack where the brackets will attach, at the U position the UPS will occupy. If the left and right posts are not equally spaced, note both readings rather than averaging them. Record the hole style and take a photo of the rear posts; those details help a distributor match the hardware. Keep the model, post spacing and kit label together in your purchase record. A generic assurance that a rail "fits a 19-inch rack" answers the width question only; it does not settle the post spacing or chassis fit.

Equipvia may earn a commission from qualifying purchases through this link. The link resolved to Product ID 1601835234981 during review. CPS resolution does not verify the seller's technical claims, the kit's contents, affiliate eligibility, or commission attribution. Check the actual selected variant and current terms before ordering.

There is a specific reason to question this listing before treating it as a source. Its selected product field displayed "programmable controller" and the page included generic PLC attributes such as I/O and communications interfaces, which conflicts with the rail-kit title. It does not establish an OEM label, model-by-model compatibility, complete package contents, or traceability, and the supplier shows one year on the platform. Ask for a current quotation, photographs of the actual SRTRK2 label and kit, the instruction sheet, and written confirmation against your UPS model.

What to ask before buying a new or used kit

A new listing should state SRTRK2 in the selected variant, not only in a page title that may cover several accessories. Have the seller identify the UPS models covered and show the current kit label, rails, cleats, brackets and hardware. If the offer is used, also ask whether anything has been cut, drilled, bent or replaced. A rail that appears straight may still be missing a locking part or a model-specific bracket.

The return terms matter here. Rails are long, heavy parcels; a mistaken part can cost real money to ship back across a border. Get a delivered quote that includes freight, duties, expected dispatch time and the written warranty route. Ask who pays for return freight if the selected item differs from the photographed kit. The page price alone cannot resolve that risk, and no reseller compatibility statement should override the exact UPS manual. If the seller proposes a cross-reference, request the Schneider document that lists that alternate number for your model.

A fit question you can send with an RFQ

Send a short, concrete request instead of asking "will this fit my APC?" For example: "My UPS nameplate reads [full model and suffix]. I need the SRTRK2 rail kit, not SURTRK2. My cabinet has four posts; the mounting-face spacing at the installation position is [measurement] mm on the left and [measurement] mm on the right. Please confirm the complete kit is listed for this exact UPS and show the label and all included brackets, cleats and hardware. I will also rack [battery pack model, if applicable]. Does the quoted kit contain the parts required for both units?"

Attach nameplate and rack photos. A seller who answers with a generic SRT kVA range but leaves the suffix, post spacing or contents unresolved has not confirmed fit. Keep that reply with the purchase order so receiving staff can compare the delivered labels and parts before the installation window.

When the fit is confirmed

Order only after the UPS model, exact rail-kit code and rack spacing agree. The published fit for SRTRK2 is Smart-UPS SRT 5/6/8/10 kVA; the separate SURTRK2 listing is for the Smart-UPS RT family. The official SRTRK2 guide assigns different hardware groups to the SRT5K, SRT6K and SRT8K/SRT10K chassis. The four-post FAQ's 36-inch maximum does not replace a measurement of your cabinet or a check of the kit's instructions.

If any one of those records is unclear, pause and send the nameplate photo, rack spacing and part-label photo to Schneider or the seller for written confirmation. A few minutes spent resolving "SRTRK2 versus SURTRK2" is cheaper than receiving a similar-looking set that cannot support the UPS in its intended rack.