APC by Schneider Electric SY40K40F Symmetra PX 40kVA Online Double-Conversion UPS
Overview
The APC by Schneider Electric SY40K40F is a 40kVA/40kW three-phase, double-conversion online UPS built for data centers, large server rooms, and mission-critical infrastructure where a split-second power event cannot be tolerated. Unlike line-interactive or standby designs, the double-conversion topology means your load runs off the inverter 100% of the time — utility power never touches your equipment directly, eliminating transfer time on switchover and continuously filtering voltage irregularities and frequency deviations. At 40,000 VA and 40,000 W, the SY40K40F is sized for high-density compute rows, large storage arrays, or centralized power for a security operations center with dozens of servers and network infrastructure. Explore the full APC by Schneider Electric power protection line for complementary UPS, PDU, and rack solutions.
Key Features
- Double-Conversion Online Topology: The load runs off a continuously regenerated sine wave output — there is zero transfer time to battery on a utility failure. For servers running real-time databases or storage arrays mid-write, even a 4ms transfer gap can cause corruption. This eliminates that risk entirely.
- 40kW / 40kVA at 0.99 Input Power Factor: A 0.99 input PF means the SY40K40F draws almost purely real power from the utility feed — near-unity PF reduces reactive current draw and cuts demand charges on your facility bill. At full 40kW load, the unit is not wasting capacity on reactive compensation.
- Modular N+1 Power Architecture (4 installed, 1 open slot): Four power modules are pre-installed in five available slots. The open slot means you can add a fifth module for N+1 redundancy without a shutdown — the system keeps running while you slot in the spare. For 24/7 environments where planned downtime is expensive, this is the architecture to specify.
- Built-In Static Bypass: If the UPS itself requires service or fails, the static bypass routes utility power directly to the load in microseconds — no manual intervention required. Combined with the modular design, this means both the power conditioning path and the bypass path are serviceable without dropping the load.
- Hard-Wire 5-Wire 3-Phase Input/Output: Both input and output terminate via hard-wire 5-wire (3PH + N + G) screw terminals. There are no twist-lock or panel connectors — this unit is wired permanently into your electrical infrastructure by a licensed electrician. Plan for conduit runs and a dedicated breaker panel on the 208V 3-phase feed.
- 4 Battery Modules Included, 2-Hour Recharge: Four lead-acid battery modules ship installed. After a discharge event, the 5,502W battery charge circuit brings modules back to full in approximately 2 hours — faster recharge means the system is ready for a second event sooner. Runtime depends on load; size your battery frame accordingly for target runtime at your actual kW draw.
- Less Than 5% THD Output: Output harmonic distortion under 5% means sensitive electronics — particularly server PSUs with active PFC — see clean power. High-THD UPS outputs can cause PFC-based supplies to behave erratically or derate. Sub-5% output THD keeps your equipment within its design envelope.
- Sine Wave Output, 57–63 Hz Sync Window: True sine wave output (not stepped approximation) at 60 Hz ±0.1% when not synced to mains, or 57–63 Hz when synced. Generator compatibility is strong — the 57–63 Hz sync window tracks typical generator frequency variance without dropping to battery unnecessarily.
- Multi-Function LCD Control Console: The front panel LCD provides status, metering, and control without requiring a laptop or network connection for basic operations — useful during commissioning or troubleshooting when network management may not yet be configured.
- NEMA 1 Enclosure, 64 dBA Acoustic Level: NEMA 1 is rated for indoor, dry locations — appropriate for a dedicated UPS room or data center floor. At 64 dBA, plan for acoustic treatment if the UPS is adjacent to a workspace; for a dedicated equipment room, this is typical for a unit of this power class.
- Replacement Battery: SYBT4: The designated replacement battery module is the SYBT4. Knowing the exact replacement part at purchase lets you pre-qualify your service contract and stock a spare module — critical for sites with strict RTO requirements.
Integration & Compatibility
The SY40K40F integrates into the Symmetra PX ecosystem. The three-phase UPS category includes compatible external battery frames and additional power modules for runtime extension or redundancy upgrades. The unit accepts a 208V 3-phase input and delivers 120V, 208V, and 208V 3-phase output simultaneously via the hard-wire output terminals, supporting mixed single-phase and three-phase load distributions common in dense server rows. With an operating altitude ceiling of 10,000 ft, the unit can be deployed at high-altitude data center sites without derating concerns. For larger installations requiring centralized power management, the LCD console and available network management card slots (2 free slots noted) allow integration with power management and DCIM platforms via SNMP or Modbus. Pair with compatible automatic transfer switches for generator integration in facilities requiring utility + generator redundancy. The SYBT4 battery module is the verified replacement part for this frame — confirm battery quantities against your target runtime at actual load before finalizing the order.
Frequently Asked Questions
Q: What is the input voltage requirement for the SY40K40F?
A: The SY40K40F requires a 208V 3-phase (5-wire: 3PH + N + G) hard-wired input at 50/60 Hz. It does not accept single-phase input or plug-in connections — installation requires a licensed electrician and a dedicated 3-phase breaker.
Q: How many power modules come installed, and can I add more?
A: Four power modules are pre-installed. The frame has five total slots, leaving one open for an additional module — enabling N+1 hot-swap redundancy without powering down the load.
Q: What is the replacement battery part number for the SY40K40F?
A: The verified replacement battery module is the SYBT4. Four battery modules are included from the factory.
Q: How long does it take to recharge the batteries after a full discharge?
A: The battery charge circuit delivers 5,502W and restores the installed battery modules to full charge in approximately 2 hours under normal conditions.
Q: What is the heat dissipation output of the SY40K40F?
A: At rated load, the unit dissipates 11,611 Btu/h. Factor this into your data center cooling design — CRAC/CRAH capacity must account for this thermal output when load is at or near full 40kW.
Q: Does the SY40K40F output a true sine wave?
A: Yes. The double-conversion design produces a true sine wave output continuously — not a stepped approximation. Total harmonic distortion is specified at less than 5%, keeping sensitive server PSUs with active PFC within their design parameters.
The SY40K40F is one of the units I recommend when a data center architect comes to me with a high-density compute row and zero tolerance for transfer time. The double-conversion topology is the key decision driver here — at 40kW continuous with a 0.99 input power factor, this unit is genuinely efficient for its class, and the modular frame means you're not locked into a fixed redundancy posture at installation time.
Technical Highlights:
- 0.99 Input Power Factor: Near-unity PF at full 40kW load means the facility sees almost purely real current draw — this directly reduces kVA demand charges and keeps your upstream distribution panel sizing honest.
- 5,502W Battery Charge Rate with 2-Hour Recovery: Fast recharge matters more than most buyers realize. A site that takes 8+ hours to recover battery capacity after a storm event has a real exposure window. The 2-hour recharge on the SY40K40F keeps that window tight.
- 11,611 Btu/h Heat Rejection: This is the number your facilities team needs before sign-off. At full 40kW load, you need roughly 1 ton of additional cooling capacity allocated just for this UPS — confirm your CRAC is not already running at ceiling before commissioning.
Deployment Considerations:
- The hard-wire 5-wire 3-phase input and output means this unit goes on its own dedicated circuit, terminated by a licensed electrician. Budget for conduit, breaker panel capacity, and commissioning labor — this is not a plug-in deployment.
- At 1,708 lbs (775 kg) and 81.5 inches tall, floor loading and doorway clearance must be verified before delivery. Data center floors rated at 150 lbs/sq ft are marginal — get a structural review if your floor spec is borderline.
The SY40K40F is the right specification for a purpose-built data center UPS room serving a high-density compute or storage deployment — particularly where generator integration is planned and the 57–63 Hz sync window needs to track generator frequency variance without unnecessary battery transfers.
