Numeric vs Delta Online UPS in India: Which One, When

NumericVSDeltaOnline UPS – India
Local value or efficiency edge? Your bill decides.
The Short Version

Numeric vs Delta UPS India: value or efficiency

Numeric is a familiar Indian brand with a wide range and Legrand service behind it. Delta brings efficiency and a small footprint. Here is where each one fits.

Free 30-min review first. 200+ Indian businesses trust Sirius Star.
200+Indian businesses served
17+ yrsin India IT
Both brandsquoted honestly
24 hrswritten quote turnaround
Numeric full guideDelta full guide
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Written by Naveen Reddy, Power and Data Centre Solutions
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Updated 3 Jul 2026
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Editorial content reviewed by Karthik Iyer
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The verdict in one line

Numeric fits SMB buyers who want a trusted Indian name, a wide range and easy service through Legrand. Delta fits buyers who care about running cost and rack space over the long haul. Sirius Star sizes both to your load before you commit.

Numeric vs Delta at a glance

Both brands in one view. Where each one wins, and where the ASP network changes the answer.

Numeric

OEM
Numeric, part of Legrand. India service through Legrand.
Range
Optima and Digital line-interactive. Premius online 10-40 kVA. KEOR frames above.
Output PF
0.9 output PF on Premius online.
Build
IGBT rectifier, wide input, isolation option.
Service
Wide Legrand service footprint in India.
Position
Value, familiar SMB brand.

Delta

OEM
Delta Electronics. India operations with local service.
Range
Amplon INX to 3 kVA. Amplon RT 5-20 kVA. Ultron above.
Output PF
Unity PF on Amplon RT and Ultron frames.
Efficiency
Double conversion tuned for low running cost. ECO mode available.
Footprint
Amplon RT is a slim 2U for tight racks.
Battery
Li-ion external packs on Amplon RT.

The Numeric and Delta ranges Sirius Star supplies

Two picks from each brand. We size the mix in the free 30-minute review.

SMB online UPS

Numeric Premius

Online double conversion for server rooms, with an IGBT rectifier and a wide input window. Isolation transformer option for sensitive loads.

Current India models: Premius 10K · 20K · 40K*
  • IGBT rectifier
  • Wide input window
  • Isolation option
Small offices

Numeric Optima and Digital

Entry line-interactive and online units for desktops and small racks, with easy local service.

Current India models: Optima 1K · Digital 1-3 kVA*
  • Simple and familiar
  • Legrand service
  • Value pricing
Efficiency-led

Delta Amplon RT

A slim 2U online UPS with unity PF, tuned to keep running cost down on always-on load. Lithium-ion battery option.

Current India models: Amplon RT 5K · RT 6K · RT 10K · RT 20K*
  • Unity PF, full watt usage
  • Low running cost
  • Li-ion external packs
Small server rooms

Delta Amplon INX

Compact online tower with a wide input window for shaky Indian mains, and ECO mode for savings.

Current India models: Amplon INX 1K · INX 2K · INX 3K*
  • Wide input window
  • ECO mode
  • Compact tower
*Disclaimer: Model numbers shown are illustrative examples of the current India line-up. Numeric and Delta refresh their line-ups periodically and stock varies by branch. Please contact Sirius Star for latest availability and price.

Numeric vs Delta: feature by feature

The specifics that decide the buy, for the Indian buyer.

FeatureNumericDelta
OEMNumeric, part of LegrandDelta Electronics
TopologyOnline double conversion on PremiusDouble conversion (VFI) across range
Output power factor0.9 output PF on PremiusUnity PF on Amplon RT and Ultron
Efficiency focusSolid, value-tunedTuned for low running cost
FootprintStandard tower and rackSlim 2U on Amplon RT
BatteryWide battery config, isolation optionLi-ion external packs on RT
Service (India)Wide Legrand service footprintMetro and DC-hub service, growing in tier-2
Best-fitFamiliar SMB pick, valueEfficiency and tight-footprint racks

Which one for what

The clean decision guide for common Indian B2B scenarios. Pick the row that fits.

You want a familiar Indian brand and easy service

Numeric. The Legrand service footprint is wide and simple to reach.

Running cost over years matters most

Delta. The efficiency edge pays back on always-on load.

Rack space is tight

Delta Amplon RT. Slim 2U with a lithium-ion path.

You want an isolation transformer for sensitive gear

Numeric Premius. The isolation option is built in.

You want the safest value pick for an SMB

Numeric on price and service. Delta if efficiency and footprint lead.

How Sirius Star sizes Numeric or Delta

Free review first. Then a written quote in 24 working hours.

1

Site survey + sizing

Free 30-min call. We map load, refresh cycle, and current estate.

2

Both brands quoted

Written quote in 24 working hours. Itemised. GST broken out.

3

PO and dispatch from Vashi

Typical 10 working days for stock SKUs. Staggered rollout if multi-site.

4

Warranty and refresh wrap

One escalation path. Refresh calendar in writing. Buyback where offered.

“We nearly bought on brand habit. Sirius Star put Numeric and Delta side by side, showed the running-cost math, and let us pick with open eyes. Numeric for the branches, Delta for the main room.”

Anonymised IT lead at a Thane SME. Sirius Star sized a mixed Numeric and Delta rollout in 2026.

Free field guide

Buying Online UPS in India

    Free. Delivered to your email after the form.

    Numeric vs Delta in India FAQ

    Common questions Indian buyers ask. Answers grounded in current sources.

    Is Numeric a good UPS brand in India?
    Yes. Numeric is a familiar Indian name, now part of Legrand, with a wide range and broad service. It is a strong value pick for SMB server rooms.
    Numeric or Delta for a small server room?
    Numeric wins on price and service familiarity. Delta wins on efficiency and footprint. Sirius Star sizes both to your load so the trade is clear.
    Does Delta cost more than Numeric?
    Often, yes, on entry frames. Delta efficiency can claw that back over years of runtime. We show both quotes with the running-cost view.
    Which handles Indian voltage swings?
    Both run wide input windows. Numeric Premius uses an IGBT rectifier with an isolation option. Delta Amplon runs a wide window too. We map your feeder first.
    Will Sirius Star service either brand?
    Yes. We size, supply and arrange onsite service for Numeric or Delta, with a written quote in 24 working hours.

    Ready for a sized Numeric/Delta quote?

    Tell us your load and city. We ship both brands, honestly.

    200+ Indian businesses trust Sirius Star. Reply within 24 working hours.

    Pair this on one PO

    What buyers typically add to a Sirius Star order.

    Brand

    Numeric UPS in India

    Premius, Optima and Digital.

    Go →    Brand

    Delta UPS in India

    Amplon and Ultron ranges.

    Go →    Category

    UPS and power solutions

    Every UPS brand we size.

    Go →    Hub

    IT hardware solutions

    The full hardware desk.

    Go →

    Related reading from the Sirius Star blog

    Long-form context from our team.

    Blog

    How to size an online UPS for an Indian server room

    Read on the blog →    Blog

    Output power factor, explained for buyers

    Read on the blog →    Blog

    What a UPS AMC should actually cover

    Read on the blog →

    Sources referenced

    1. Online UPS for high-end systems in India (r/IndianGaming)–
    2. Top UPS vendor: Delta, Microtek or APC (Quora)–
    3. Delta Amplon RT online UPS–