APC by Schneider Electric E3SUPS15KFBS Easy UPS 3S 15 kVA 208V 3-Phase Double-Conversion UPS
Overview
The APC by Schneider Electric E3SUPS15KFBS is a 15 kVA / 15 kW three-phase double-conversion online UPS designed for electrical rooms and mid-size commercial or industrial power protection applications. Operating at 208V AC output with a 0.9 power factor load rating, this unit ships without batteries — three internal VRLA battery slots accept field-installed battery modules, letting you right-size runtime to the load rather than paying for capacity you don't need on day one. The double-conversion online topology means your connected equipment never runs on raw utility power: incoming AC is continuously rectified to DC, then inverted back to clean 208V AC at 60 Hz, isolating loads from sags, surges, frequency variation, and harmonic distortion before they ever reach your equipment.
Explore the full APC by Schneider Electric power protection lineup for complementary runtime extension modules and management accessories.
Key Features
- Double-Conversion Online Topology: Unlike line-interactive or standby designs that switch to battery only on failure, the E3SUPS15KFBS regenerates output power continuously. Your load sees a stable, inverter-synthesized 208V AC waveform regardless of what the utility is doing — critical for sensitive electronics, PLCs, and server infrastructure that react poorly to even brief transfer gaps.
- 15 kVA / 15 kW at 0.9 Power Factor: A unity-adjacent 0.9 power factor rating means the kVA and kW figures are nearly identical, so you lose almost nothing to reactive overhead. That translates directly to usable capacity — 15 kW of real load is supportable rather than the 10–12 kW you'd get from an older 0.7-PF design at the same kVA rating.
- Input Harmonic Distortion Under 3%: Drawing less than 3% THD at full load keeps this UPS from degrading upstream power quality. For facilities with shared distribution panels, a low-THD UPS avoids nuisance breaker trips and transformer heating that high-harmonic loads cause over time.
- Output Voltage Tolerance ±1.5%: The inverter holds output within 1.5% of 208V under all load conditions, well within the tolerance band required by most enterprise network and telecom equipment. Tighter regulation means less thermal stress on connected power supplies.
- Output Harmonic Distortion Under 3% (Linear Load): Clean sinusoidal output protects motor loads, variable-frequency drives, and any equipment with onboard power-factor-correction circuitry. Distorted output from cheaper UPS designs can cause those loads to run hot or trip protection circuits.
- Three Empty VRLA Battery Slots: The unit ships batteries-out, letting you procure runtime to match your actual load profile. Adding all three battery modules later scales runtime without replacing the UPS chassis — a meaningful total-cost-of-ownership factor over a multi-year deployment.
- Optional Network Management Card 3 Support: The NMC3 slot enables remote monitoring, SNMP integration, and automated shutdown coordination with your UPS management infrastructure. Without it, you're managing the unit locally; with it, you get full network visibility and event alerting.
- 60 dBA Acoustic Level: At 60 dBA, this unit is audible but not disruptive in a dedicated electrical room. It's not spec'd for open office deployment — plan for an equipment closet or purpose-built UPS room.
- 852 W Heat Dissipation: Budget 852 W of thermal load into your room cooling calculations. In a sealed electrical room, that's a non-trivial heat source — confirm your HVAC or supplemental cooling can handle it before commissioning.
- IP20 Enclosure: IP20 protects against finger contact with live parts but provides no meaningful dust or moisture protection. This is strictly an indoor, conditioned-space unit — not rated for factory floors with particulate exposure or any wet environment.
- Operating Altitude Up to 4,921 ft (1,501 m): The unit is derated above 4,921 ft. Deployments at higher elevation — mountain data centers, high-altitude facilities — need to verify derating tables before assuming full 15 kW output is available.
- CE, EAC, and RCM Certified: Carries CE (European conformity), EAC (Eurasian), and RCM (Australian/New Zealand) marks. Verify local AHJ requirements; UL/cUL listing is not listed in the available evidence and should be confirmed before specifying for North American installations where UL listing is required by code.
Integration & Compatibility
The E3SUPS15KFBS accepts three-phase input at 380V, 400V, or 415V AC — standard voltages across European, Middle Eastern, and international three-phase distribution. Output is 208V AC at 60 Hz, suitable for North American equipment in international facilities or purpose-wired US commercial installations. The 240V DC battery bus is designed for APC's compatible VRLA battery modules; confirm battery module compatibility with APC before procurement. The optional Network Management Card 3 slot enables SNMP v1/v2c/v3, Modbus, and BACnet integration depending on the NMC3 variant selected, supporting integration with building management systems and enterprise monitoring platforms. Input maximum current draw of 28A at full load should be verified against your upstream breaker and conductor sizing — consult local electrical codes for three-phase circuit protection requirements. The 10 kA maximum short-circuit current rating is relevant to panel coordination studies; confirm your distribution equipment interrupting capacity meets or exceeds this value.
What's in the Box
- 1x E3SUPS15KFBS UPS chassis (batteries not included)
- 1x Dust filter
- 1x Installation guide
Frequently Asked Questions
Q: Does the E3SUPS15KFBS come with batteries installed?
A: No. The unit ships with zero battery modules installed and three empty VRLA battery slots. You procure and install compatible APC battery modules separately to achieve your target runtime. This lets you match battery investment to your actual load and runtime requirements.
Q: What is the output voltage of the E3SUPS15KFBS?
A: The output is 208V AC at 60 Hz. Input accepts three-phase 380V, 400V, or 415V AC at up to 28A. This makes it suitable for facilities running international three-phase distribution feeding North American 208V equipment.
Q: Can the E3SUPS15KFBS be monitored remotely over the network?
A: Remote monitoring requires the optional Network Management Card 3 (NMC3), which is not included. With the NMC3 installed, the unit supports SNMP and other network management protocols. Without it, monitoring is local only.
Q: What is the UPS topology of the E3SUPS15KFBS?
A: Double-conversion online. The UPS continuously converts incoming AC to DC and back to AC, so connected equipment always runs on inverter-synthesized power. There is no transfer time on utility failure — the load never sees a break in power.
Q: Is the E3SUPS15KFBS suitable for outdoor or dusty industrial environments?
A: No. The unit carries an IP20 rating, which protects only against contact with live parts. It is designed for indoor, conditioned electrical rooms. It is not suitable for outdoor installation, high-particulate environments, or any location with moisture exposure.
Q: What certifications does the E3SUPS15KFBS carry?
A: CE, EAC, and RCM certifications are confirmed from available evidence. UL or cUL listing is not confirmed in available specifications — verify with APC directly if UL listing is required for your installation or local code compliance.
The E3SUPS15KFBS is a batteries-out 15 kVA double-conversion UPS — a deliberate design choice that separates the chassis investment from the runtime investment. I see this misread in the field regularly: buyers expect batteries included at this price point. They're not. You're buying the conversion platform; the three VRLA slots let you install APC battery modules to match your actual load and target runtime, rather than paying for a fixed runtime tier that may not fit your application. At 112 kg before batteries, plan your floor loading and access route carefully before delivery.
Technical Highlights:
- Input THD <3% at Full Load: Drawing under 3% total harmonic distortion keeps this unit from polluting the upstream distribution panel. That matters in shared electrical rooms where other sensitive loads share the same transformer — high-harmonic UPS designs are a known source of nuisance trips and transformer overheating in dense equipment rooms.
- ±1.5% Output Voltage Regulation: The inverter holds 208V AC within 1.5% under all load conditions. Most enterprise switching power supplies tolerate ±5–10%, so this headroom is comfortable — but it also means you're not chasing voltage-induced failures on sensitive instrumentation or telecom gear that sits at the edge of its input specification.
- 852 W Heat Dissipation: At full load, this unit puts 852 W of heat into the room. In a 300 sq ft electrical room with no supplemental cooling, that's a real thermal load — confirm your room's BTU/hr capacity before commissioning, and account for additional heat from the battery modules you install.
Deployment Considerations:
- The unit accepts 380V, 400V, or 415V three-phase input but outputs 208V AC — confirm your downstream equipment is wired for 208V (not 240V single-phase or 480V) before commissioning. A wiring mismatch at 15 kW is a serious incident.
- IP20 rating means this unit requires a clean, conditioned indoor space. It ships with a dust filter, but that's a maintenance item, not a substitute for environmental control. Operating altitude is capped at 4,921 ft (1,501 m) before derating — high-altitude data halls need to verify capacity figures with APC before specifying this chassis.
The E3SUPS15KFBS is well-suited for mid-size electrical room deployments feeding three-phase 208V critical loads — commercial HVAC controls, security head-end rooms, or network aggregation closets in facilities with international three-phase distribution. It is not the right choice for open floor, high-dust, or high-altitude deployments without additional engineering review.
