Schneider Electric (APC) Symmetra PX Static Switch Module, 40-250 kW (SYSW40KF, SYSW80KF, SYSW80KH, SYSW250KD)
APC's Symmetra PX static switch module, a frame-locked UPS accessory from SYSW40KF to SYSW250KD
Schneider Electric (APC) Symmetra PX Static Switch Module, 40-250 kW (SYSW40KF, SYSW80KF, SYSW80KH, SYSW250KD) is one of 4 static transfer switches tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Schneider Electric APC Symmetra PX static switch module dossier: SYSW40KF to SYSW250KD ratings, frame lock-in, UL 1778 listing scope, and per-amp pricing.
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 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
Configurations and options
Configuration is fixed per part number rather than field-selectable: each module ships at one rated kW/kVA and one voltage class matched to a single Symmetra PX frame size, with no documented field-adjustable transfer algorithm of the kind Eaton's WaveStar offers between POG and VSS modes.
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
Trend: flat 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..
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.