APC by Schneider Electric Easy UPS 3S 20 KVA 208V 3:3 UPS for Internal Batteries - E3SUPS20KFBS

APC by Schneider Electric E3SUPS20KFBS Easy UPS 3S 20kVA 208V 3-Phase Online UPS

Overview

The APC by Schneider Electric E3SUPS20KFBS is a 20 kVA / 20,000 W three-phase, double-conversion online UPS designed for mid-size commercial and industrial deployments where clean, uninterrupted power is non-negotiable. Running a true online double-conversion topology, it continuously regenerates output power from the inverter — meaning connected loads never see raw utility power at all. Voltage sags, swells, frequency drift, and harmonic distortion are scrubbed before they reach your equipment. This is the architecture to specify when you need zero transfer time and tightly conditioned output, not just a fallback source.

The 3:3 designation means both input and output are three-phase 208V — this unit slots into three-phase distribution infrastructure and feeds three-phase loads, which is the standard configuration for larger server rooms, edge data centers, and high-density AV or broadcast equipment racks. If your facility runs single-phase distribution to the UPS, this is not the correct model; look to the 1:1 variants in the Easy UPS 3S family instead.

For more options across the APC by Schneider Electric power protection line, including tower and rackmount UPS configurations, browse the full catalog.

Key Features

• Double-Conversion Online Topology: The inverter is always in the power path — there is no transfer switching under normal conditions. For sensitive loads like servers, storage arrays, or precision instruments, this eliminates the 4–8 ms transfer gap that line-interactive designs carry. If grid quality at your site is poor, this topology handles it transparently.
• 20 kVA / 20,000 W Output Capacity: A 1.0 power factor rating means the kVA and kW figures are equal — no derating for typical IT and industrial loads. Size your connected load budget against the 20,000 W ceiling, not an 80% de-rated figure.
• 208V Input / Output, 40–70 Hz Acceptance: The wide frequency tolerance (40–70 Hz) accommodates generator sources that drift under load — an important detail if this UPS is part of a generator-backed power chain. The 208–220V input window covers standard North American three-phase distribution without a step-up transformer.
• 4% Input Current THD: Low input harmonic distortion at 4% THD means the UPS draws near-sinusoidal current from the utility or generator. This matters in buildings with multiple large UPS units on shared distribution — high-THD UPS installations can create harmonic interference that trips breakers or overheats transformers. At 4%, this unit imposes minimal harmonic burden on upstream infrastructure.
• Overload Protection: The unit includes active overload protection — when connected load exceeds rated capacity, the UPS can respond before damage occurs to either the UPS or downstream equipment. Factor this into your load-growth planning: at 20 kW, you have meaningful headroom for a mid-size deployment, but model your peak draw, not just average draw.
• 96V Battery Bus: The internal battery architecture operates at 96V DC. The model number suffix 'FBS' indicates this unit is configured for internal batteries. Confirm your battery module selection matches the internal battery bay configuration before ordering — the runtime per battery string depends on your actual load, not rated capacity.
• LCD Touchscreen Control Panel: A local touchscreen display provides real-time status without requiring a laptop or network connection. For facilities teams doing routine walk-through checks, this means immediate visibility into load percentage, battery state-of-charge, and any active alarms — no remote login required.
• 68 dB Noise Floor: At 68 dB(A), this unit is roughly equivalent to a conversational speaking level. It's acceptable in a dedicated equipment room but is audible in a quiet office environment. Factor this into placement decisions — mechanical room or dedicated IDF/MDF room installation is preferable to open-plan spaces.
• 1,400 BTU/h Heat Dissipation: Thermal output at full load is 1,400 BTU/h. Feed this figure directly into your room cooling calculations. For a small server room running multiple devices, the UPS itself contributes roughly the equivalent of a mid-size tower server to the cooling load — account for it.
• IP20 Enclosure Rating: IP20 means the enclosure is protected against solid objects over 12mm (finger-safe) but carries no water ingress rating. This is an indoor, climate-controlled installation — do not deploy in wet or dusty environments without additional enclosure protection.
• 50/60 Hz Output: Output frequency is switchable between 50 and 60 Hz, making this unit compatible with both North American and international load equipment — useful in mixed-standard environments or when equipment is sourced globally.

Integration and Compatibility

The E3SUPS20KFBS is designed for integration into standard three-phase power infrastructure. The 208V 3:3 configuration connects upstream to a three-phase 208V service and downstream to three-phase 208V load panels or direct equipment feeds. It is compatible with three-phase UPS accessories including extended battery modules (EBM) for runtime extension — verify EBM compatibility against the Easy UPS 3S family documentation before purchasing.

For network monitoring and remote management, APC UPS units in this class typically support SNMP/network management cards (sold separately). The onboard LCD touchscreen handles local status and control. If your operations team requires integration with a DCIM platform or remote shutdown software, confirm NMC card availability and slot compatibility for this model before specifying.

Pair with a compatible power distribution unit (PDU) downstream to distribute the 20 kW output across rack equipment cleanly. For deployments requiring extended runtime beyond what internal batteries provide, the Easy UPS 3S family supports external battery modules — consult the product family compatibility matrix for matched EBM models.

Frequently Asked Questions

Q: What is the difference between the E3SUPS20KFBS and a line-interactive UPS at the same kVA rating?

A: The E3SUPS20KFBS uses a double-conversion online topology, meaning the inverter is always in the power path and connected loads are fully isolated from utility power irregularities at all times. A line-interactive UPS only switches to battery during outages or severe voltage events, so it has a brief transfer time (typically 4–8 ms) and passes some utility-side harmonics and noise through to connected equipment. For sensitive three-phase loads — servers, storage, medical equipment — the double-conversion architecture of the E3SUPS20KFBS is the appropriate choice.

Q: Does the E3SUPS20KFBS ship with internal batteries included?

A: The 'FBS' suffix in the model number indicates this unit is configured for internal batteries. Verify with your order confirmation whether battery modules are included or must be purchased separately as matched battery packs for this chassis.

Q: What input frequency range does the E3SUPS20KFBS accept?

A: The unit accepts input frequencies from 40 to 70 Hz. This wide tolerance is intentional for generator-backed installations, where generator output frequency can vary under load. If your site uses a generator as a primary or backup source, this range provides the headroom needed for stable operation.

Q: What is the heat output of the E3SUPS20KFBS at full load?

A: At full rated load, the unit dissipates 1,400 BTU/h. This figure should be included in your room-level HVAC and cooling load calculations. For a dedicated equipment room, this is a meaningful but manageable contribution — equivalent to roughly a mid-range 1U server at full load.

Q: Can the E3SUPS20KFBS be installed in a wet or outdoor environment?

A: No. The E3SUPS20KFBS carries an IP20 enclosure rating, which provides protection against contact with internal components but no protection against water ingress. This unit must be installed in a climate-controlled indoor environment. For applications requiring outdoor or wet-location UPS protection, a higher IP-rated enclosure or dedicated outdoor UPS housing would be required.

Q: What is the input current harmonic distortion (THD) of the E3SUPS20KFBS?

A: Input current THD is 4%. This is low for a UPS in this power class, which reduces the harmonic load imposed on upstream distribution transformers and shared branch circuits. In facilities with multiple large UPS units, low THD helps prevent cumulative harmonic distortion issues that can cause transformer overheating or nuisance tripping.

Eden Phillips

The E3SUPS20KFBS sits in an interesting spot in the Easy UPS 3S family — the 20 kVA / 20,000 W output at unity power factor means you're not losing capacity to derating, and the 4% input THD is genuinely low for a transformer-based online double-conversion unit at this power level. For integrators specifying power protection in shared-distribution buildings, that harmonic footprint matters more than most buyers realize until they've had a facility-wide harmonic audit flag their UPS installation.

Technical Highlights:

• Unity Power Factor (1.0 PF): The kVA and kW ratings are identical at 20,000 W — no capacity is lost to PF derating. This simplifies load budgeting: your 20 kW ceiling is the real ceiling for connected IT and industrial loads.
• 40–70 Hz Input Frequency Acceptance: This range is wider than most competitive units in the class. For deployments backed by a diesel generator — common in healthcare, manufacturing, and edge data center builds — generator frequency droop under load won't cause the UPS to reject the source and drop to battery.
• 1,400 BTU/h Thermal Output: At full load, the unit contributes 1,400 BTU/h to the room. In a tight IDF or edge closet, that's a real number to hand the mechanical engineer — not a spec to leave out of the cooling load sheet.

Deployment Considerations:

• IP20 rating means this must go into a controlled indoor environment — no exposed plant rooms, no damp basements without proper enclosures. The white finish and touch LCD also suggest a finished mechanical or IT room installation, not an industrial floor.
• The 68 dB noise rating is livable in a dedicated equipment room but will be noticeable if the unit is installed in a shared workspace or open IT area — placement matters.

This unit is well-matched for a mid-size edge data center, a healthcare imaging suite with three-phase distribution, or a broadcast/production facility running three-phase 208V loads where generator compatibility and low input harmonics are hard requirements on the spec sheet.