Schneider Electric Symmetra PX Static Switch Module, 40-250 kW (SYSW40KF, SYSW80KF, SYSW80KH, SYSW250KD)
Manufacturer: Schneider Electric
APC's Symmetra PX static switch module, a frame-locked UPS accessory from SYSW40KF to SYSW250KD
This model is part of SecondWatt’s static transfer switche research catalogue. Specifications and price observations are included where supported by sources. Equipment availability and commercial terms require confirmation.
Schneider Electric APC Symmetra PX static switch module dossier: SYSW40KF to SYSW250KD ratings, frame lock-in, UL 1778 listing scope, and per-amp pricing.
Schneider Electric does not sell a static transfer switch called Power Sentry. That name belongs to three unrelated companies, an Acuity Brands lighting brand, a UPS brand acquired by Power Technology in 2006, and an oil-and-gas energy-services firm, none connected to Schneider or Square D. The product documented here instead is the APC Symmetra PX Static Switch Module family: SYSW40KF, SYSW80KF, SYSW80KH and SYSW250KD, spanning 40 to 250 kW.
This is an accessory module, not a standalone two-source STS cabinet. It is sized to one specific Symmetra PX UPS frame and voltage class: a SYSW80KF fits nothing but an 80 kW-class, 208 V frame, and will not power up in a 400 V, 40 kW or 250 kW frame. Its resale value is capped by that host frame's own end-of-service date, so a functionally perfect module for a frame already past end of service is close to worthless.
Its certification pedigree runs through the host UPS rather than the transfer-switch standard. The Symmetra PX 250/500 system, and the static switch module inside it, is documented as UL 1778 and CSA C22.2 No. 107.3-05 compliant, not independently listed to UL 1008S the way Eaton's WaveStar, ABB's Cyberex and Vertiv's Liebert STS2 are.
Schneider once sold a genuinely standalone, source-agnostic STS: MGE Epsilon, discontinued in 2015 with end of service in 2023 and explicitly not replaced. Its successor, MGE Upsilon, shows a contradictory status on Schneider's own site today, and a buyer wanting a standalone Schneider STS gets no clean answer from se.com and should look to ABB, Eaton or Vertiv instead.
Why it matters
This is the item most likely to be mistaken for a standalone Schneider static transfer switch, when it is actually a frame-locked accessory whose value depends entirely on a host UPS most Symmetra PX buyers did not think to check the status of. The 80 kW frame reached end of service in 2021 and the 250/500 frame was discontinued in September 2025, so a module bought without confirming the frame's own lifecycle can be functionally worthless the day it arrives.
Who buys it
Data centers and enterprises already running a Symmetra PX 40, 80 or 250/500 UPS frame that need a replacement or spare static bypass module, not a buyer shopping for a general-purpose two-source STS. A used-equipment buyer here is really buying a part number that only works with a frame they already own, so confirming the exact host frame model and its own end-of-service date matters more than the module's condition alone.
Role in the data center
Internal to one Symmetra PX UPS frame, arbitrating between the frame's own inverter output and a raw bypass source during overload or fault conditions, rather than sitting between two independent upstream sources the way a standalone floor-mount STS does.
Key specifications
| Rated capacity, SYSW40KF | 40 kW/kVA |
|---|---|
| Rated voltage, SYSW40KF | 208 VAC |
| Calculated current, SYSW40KF (derived, S=sqrt3VI) | 111.0 A |
| Weight, SYSW40KF | 50.71 lb |
| Dimensions, SYSW40KF (WxHxD) | 20 x 8 x 28 in |
| Rated capacity, SYSW80KF | 80 kW/kVA |
| Rated voltage, SYSW80KF | 208 VAC |
| Calculated current, SYSW80KF (derived) | 222.1 A |
| Weight and dimensions, SYSW80KH (400V sibling, WxHxD) | 77.16 lb, 19 x 16.3 x 15.5 lb / in |
| Rated capacity, SYSW250KD | 250 kW / 250,000 VA |
| Rated voltage, SYSW250KD (dual) | 400/480 VAC |
| Weight, SYSW250KD | 174.36 lb |
| Dimensions, SYSW250KD (WxHxD) | 19.3 x 23.3 x 33.1 in |
| Standards listing, host UPS system | UL 1778, ULc, UL 60950-1, CSA C22.2 No. 107.3-05, OSHPD, ENERGY STAR |
| Power-module firmware end-of-life timer, 250/500 line | 10 years, calendar-tracked |
| Warranty, new-channel purchase observed | 1 year |
Technical summary
Rated capacity, SYSW40KF: 40 kW / 40 kVA, 208 VAC. Rated capacity, SYSW80KF: 80 kW / 80 kVA, 208 VAC. Rated capacity, SYSW80KH: 80 kW, 400 VAC. Rated capacity, SYSW250KD: 250 kW / 250,000 VA, 400/480 VAC dual-rated. Calculated current (S=sqrt3 x V x I): 111.0 A (SYSW40KF), 222.1 A (SYSW80KF), 115.5 A (SYSW80KH), 300.8 A at 480V or 360.8 A at 400V (SYSW250KD). Weight: 50.71 lbs (SYSW40KF), 77.16 lbs (SYSW80KH), 174.36 lbs (SYSW250KD). Dimensions (WxHxD): 20x8x28in (SYSW40KF), 19x16.3x15.5in (SYSW80KH), 19.3x23.3x33.1in (SYSW250KD). Standards, host UPS system: UL 1778, ULc, UL 60950-1, CSA C22.2 No. 107.3-05, OSHPD, ENERGY STAR. Schneider publishes no UL 1008S listing for the module independently of the host UPS. Firmware lifecycle: 10-year end-of-life alarm timer on 250/500-line power modules, calendar-tracked. Hot-swap: supported on Symmetra PX 80 and 100 frames, not supported on the Symmetra PX 40 frame. Warranty, new-channel purchase observed: 1-2 years.
Major variations
Four part numbers are documented here in depth: SYSW40KF (40 kW, 208 V), SYSW80KF (80 kW, 208 V), SYSW80KH (80 kW, 400 V) and SYSW250KD (250 kW, dual 400/480 V). Schneider's own accessories range description additionally names SYSW48KH, SYSW500KD and SYSW1000KH as siblings, confirming the family tracks the full Symmetra PX frame range rather than being a fixed lineup. Separately, and not a variant of this module, Schneider sold a genuinely standalone, source-agnostic STS under the MGE brand. MGE Epsilon (STE200/STE400/STE600, 200-600 A) is confirmed discontinued in 2015, end of service December 2023, with page text stating it 'has not been replaced.' Its successor, MGE Upsilon (30-630 A), shows a contradiction on Schneider's own site: a German-market SKU shows discontinued May 5, 2026 with no replacement.
Configurations and options
Configuration is fixed per part number rather than field-selectable: each module ships at one rated kW and one voltage class matched to a single Symmetra PX frame size, with no field-adjustable transfer algorithm of the kind Eaton's WaveStar offers between POG and VSS modes. The catalogued part numbers are SYSW40KF (40 kW), SYSW80KF (80 kW, 208 V), SYSW80KH (80 kW, 400 V) and SYSW250KD (250 kW). Hot-swap capability is a property of the host frame rather than the module: Schneider states modules on the Symmetra PX 80 and 100 frames may be hot-swapped, while the Symmetra PX 40 does not support the procedure.
Compatibility and dependencies
A module is only usable with the one Symmetra PX frame size and voltage class it was built for; a SYSW80KF (208 V) does not fit a SYSW80KH-class 400 V frame, and neither fits a 40 kW or 250 kW frame. Hot-swap capability itself is frame-dependent: Schneider's own support community states modules on the Symmetra PX 80 and 100 frames may be hot-swapped, while the same procedure is not possible on the Symmetra PX 40. A buyer must confirm the exact host frame model, not just the module part number, before assuming fit or field-replaceability.
Pricing and availability
Published price range: 23.82 to 53.32 USD per amp new (Compsource, CDW, PCNation, Zones, and Octopart-listed Voyager/Newark/Arrow/Rapid Electronics pricing for SYSW40KF, SYSW80KF and SYSW250KD); 6.48 to 16.55 USD per amp refurbished (Gruber Power Services, HardwareJet, Somerset Power Systems, and one eBay resale of a Gruber unit).. Trend: stable Warranty, new: 1 to 2 years across new-channel distributor listings for these part numbers; Schneider publishes no warranty term for the static switch module specifically, apart from the host UPS system's own warranty terms.. Warranty, used: 90 days to 1 year observed across refurbished-tier dealer listings for these part numbers, a spread that materially changes the risk of a near-worthless module if the host frame is also near end of service..
Lifecycle and maintenance
Service life tracks the host Symmetra PX frame, not the module in isolation; Schneider publishes no standalone overhaul interval for the module apart from the host frame's own service coverage. The 80 kW frame was discontinued in 2011 and reached end of service in 2021, extendable to 2024-2026 via Schneider's Modular Power Revitalization Service. The 250/500 frame was discontinued in September 2025 with service coverage through 2035. Power modules on the 250/500 line separately carry a firmware-tracked 10-year end-of-life alarm timer, independent of actual component failure.
Thermal and emissions profile
A static switch module produces no emissions of its own. It is a solid-state semiconductor device that arbitrates between a UPS inverter output and a raw bypass source, not a combustion machine and not a refrigerant-bearing one, so stack emissions and refrigerant GWP accounting do not apply to this product class at all. Its documented certification basis is UL 1778 and CSA C22.2 No. 107.3-05 as part of the host Symmetra PX UPS system, not an independent UL 1008S static-transfer-switch listing of the kind Eaton, ABB and Vertiv publish for their standalone units.
Common failure points
- Gate driver board — Static switch fails to transfer or reports a fault code, with no load-loss visible from outside the cabinet
- Output/DC-bus capacitors — Bulging, leakage, or discoloration on accessible boards, with no external alarm until failure
- Cooling fan — Elevated heatsink-temperature alarm or audible bearing noise
- Backplane card-edge connector — Intermittent contact, or a module that will not seat fully on install
- Intelligence-module firmware mismatch — False end-of-life or health alarm despite a functional module
- Host-frame obsolescence — Module tests functional but no replacement, repair, or firmware support exists because the host UPS frame has passed end of service
- Hot-swap procedure mismatch — A technician attempts a live hot-swap on a frame size that does not support it, risking an unplanned load interruption
Inspection checklist
Confirm the exact host frame model and voltage class before buying: a module built for one voltage class will not power up in a different one. Match nameplate voltage to the host frame exactly: 208 V modules (SYSW40KF, SYSW80KF) do not fit 400 V or 480 V frames (SYSW80KH, SYSW250KD), and the reverse. Request the host UPS frame's own end-of-service date in writing: the 80 kW frame reached end of service in 2021 and the 250/500 frame was discontinued in September 2025. Ask for the module's install date or hour count from UPS event-log data: Symmetra PX power modules run on a firmware-tracked 10-year end-of-life timer, aging on a calendar basis.
Procurement channels
New-channel: Compsource, CDW, PCNation and Exxact list individual part numbers directly with live pricing; Octopart aggregates authorized-distributor quotes from Voyager Components, Newark, Arrow Electronics and Rapid Electronics for SYSW250KD. Refurbished-channel: Gruber Power Services, HardwareJet and Somerset Power Systems list refurbished units directly, and eBay carries resold Gruber stock at a markup over Gruber's own price.
Regional notes
All part numbers and pricing documented here are North American (208/400/480 V nameplates, USD pricing). One EU distributor lists the module in EUR, out of stock as of August 2026; the USD figures here do not include it.