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GRIDVAR-C
Compact Series

Three-level NPC power stage. Module ratings 30 – 150 A, 88 mm module height (30, 50 and 75 A). Full 2nd–50th harmonic filtering. Built for retrofit and space-constrained industrial installations.

30 – 150 A 2nd – 50th harmonic ≤ 10 ms response ≥ 97.5% efficiency 3P3W / 3P4W
SVG Reactive Compensation + Harmonic Filtering
88 mm height — drawer / wall / vertical
2nd – 50th harmonic filtering
Up to 20 modules / cabinet
≤ 10 ms response time
Division 02 — Active Power Quality

Rated in amperes,
not in kvar

GRIDVAR-C is Forte's high-density active compensation module — designed specifically for retrofit projects, motor control centres (MCC) and any installation where cabinet space is at a premium.

An active harmonic filter is not rated in kvar the way a compensation capacitor is — it is rated by the harmonic current it can inject. GRIDVAR-C is built in five ratings: 30, 50, 75, 100 and 150 A. The 30, 50 and 75 A modules are 88 mm high and slide into existing switchboard frames as a drawer-type cassette; the 100 and 150 A modules are 100 mm.

Despite its compact footprint, GRIDVAR-C delivers full 2nd–50th harmonic filtering and 3-phase load balancing with software-configurable priority allocation — no performance compromise.

30 – 150 A 2nd – 50th harmonic ≤ 10 ms ≥ 97.5% efficiency Retrofit ready
GRIDVAR-C Module — View 1 GRIDVAR-C Module — View 2 GRIDVAR-C Module — View 3 GRIDVAR-C Module — View 4
88 mm
Module height
(30, 50 and 75 A)
20
Modules in parallel
per cabinet max.
≤ 10 ms
Total response time
to load changes
50th
Highest filtered
harmonic order
Technical Specifications

GRIDVAR-C — Full Specification

All parameters from the official Forte engineering datasheet. Contact our team for project-specific configurations and custom capacity requirements.

ParameterSpecification
SUPPLY
Product seriesGRIDVAR-C — Compact Active Harmonic Filter
Circuit topologyThree-level NPC
Rated voltage400 V AC
Input voltage range−20 … +20%
Nominal frequency50 / 60 Hz (−10 … +10%)
Wire system3P3W / 3P4W
FILTERING PERFORMANCE
Module ratings30 A · 50 A · 75 A · 100 A · 150 A
FunctionActive harmonic filtering (AHF). The same power stage also supplies reactive current and corrects phase imbalance — the share given to each task is set at commissioning.
Harmonic range2nd … 50th — each order individually selectable
Cancellation ability> 95% (at rated load)
Response time≤ 10 ms
Overload capacity110% continuous · 120% for 1 min
System efficiency≥ 97.5%
Power factor controlInductive or capacitive, 0 … 100%
Load balancing100% compensation of unbalanced load
SYSTEM
Modules in parallel20 modules
RedundancyAny module can operate stand-alone
CT connectionOpen or closed loop — open loop recommended when paralleled
Between modulesCAN, RJ45
FieldbusRS485 / CAN · Modbus RTU
CoolingForced fan cooling, speed controlled by output current and temperature
ENVIRONMENT
Ambient temperature−25 … +55 °C (derating above 45 °C)
Storage temperature−45 … +70 °C
Relative humidity5 … 95% RH (non-condensing)
Altitude1 500 m (derating above)
Noise level< 56 … < 69 dB (depending on module and load)
Degree of protectionIP20
COMPLIANCE
Safety standardEN 62477-1:2012 + A11:2014 + A1:2017 + A12:2021
EMC immunity and emissionEN IEC 61000-6-2:2019 · EN IEC 61000-6-4:2019
MarkingCE
Key Features

Why GRIDVAR-C Outperforms

Performance and compactness, simultaneously — without compromise on either.

88 mm module height

The 30, 50 and 75 A modules are 88 mm high; the 100 and 150 A modules are 100 mm. They fit into existing MCC frames and switchboards as a drawer cassette, without structural modifications.

Up to 20 Modules in One Cabinet

Rack-type parallel connection allows up to 20 GRIDVAR-C modules in a single cabinet. Multiple cabinets can be paralleled for larger projects. Total cabinet capacity depends on selected module sizes.

2nd – 50th Harmonic Filtering

GRIDVAR-C covers the harmonic spectrum from the 2nd to the 50th order. Each harmonic order can be independently enabled or disabled via software — allowing precise tuning to your load profile.

≤ 10 ms Response Time

GRIDVAR-C tracks reactive power and harmonic demand continuously — responding in ≤10 ms to every load change. Suitable for crane drives, welding machines, and other rapidly changing loads.

Software-Configurable Priority

Reactive compensation, harmonic filtering and 3-phase load balancing functions can each be assigned a priority weighting — allocating module capacity precisely where it is needed most.

Every module can stand alone

Any GRIDVAR-C module can operate stand-alone. If one module drops out the remaining modules keep working — the installation does not stop. Modules communicate over CAN and RJ45.

Installation Flexibility

Three Mounting Options

GRIDVAR-C adapts to your installation environment — not the other way around.

Drawer (Rack)

Slides into standard switchboard frames. The most common installation for new panels and MCC retrofits.

  • 88 mm module height (30, 50 and 75 A)
  • Fits standard 600 mm deep cabinets
  • Side-by-side stacking for high capacity
  • Hot-swap live module exchange

Wall-Mounted

Direct wall installation for decentralised compensation close to the load point.

  • No separate cabinet required
  • Ideal for transformer room installations
  • Compact footprint — minimal floor space
  • Easy access for service
  • Suitable for individual feeder compensation

Vertical Cabinet

Floor-standing vertical configuration for standalone active compensation panels.

  • Forte-fabricated complete panel
  • Integrated main breaker and fusing
  • Custom capacity to project requirements
  • Factory Acceptance Test (FAT) included
  • Ready for site installation
Module Variants

Five module ratings

All GRIDVAR-C modules share the same platform. Choose the rating from the harmonic current your measurement calls for; modules are paralleled to reach the total current required.

30
A
Height88 mm
Size (W×H×D)230 × 88 × 400
Weight7,5 kg
MountingWall
50
A
Height88 mm
Size (W×H×D)440 × 88 × 425
Weight14 kg
MountingRack / wall
75
A
Most specified
Height88 mm
Size (W×H×D)440 × 88 × 425
Weight16 kg
MountingRack / wall
100
A
Height100 mm
Size (W×H×D)500 × 100 × 550
Weight29 kg
MountingRack / wall
150
A
Height100 mm
Size (W×H×D)500 × 100 × 550
Weight31 kg
MountingRack / wall

All modules: 400 V AC · 3P3W / 3P4W · IP20 · EN 62477-1 · EN IEC 61000-6-2 / -6-4

Hybrid Compatibility

SVGC — Upgrade Your Existing Passive System

Add a GRIDVAR-C module to any GRIDFIX passive compensation system to create an SVGC hybrid — achieving perfect power factor at the lowest capital investment.

Existing Infrastructure

GRIDFIX LC Stage

Your existing thyristor-switched capacitor/reactor banks handle the base and stable load components economically. No replacement — capital investment retained.

Add GRIDVAR-C

SVGC Hybrid Result

Perfect power factor at the lowest capital cost. GRIDVAR-C steplessly compensates the dynamic residual demand and instantly suppresses harmonics — filling every blind spot left by the LC stages.

Best cost-to-performance ratio
New Capability

GRIDVAR-C Module

Steplessly compensates rapidly changing dynamic loads and blind spots between LC steps. Instantly suppresses harmonics and imbalances that passive stages cannot address.

Applications

Where GRIDVAR-C Delivers Maximum Value

Especially suited wherever cabinet space is limited, an existing system needs upgrading, or dynamic loads require active compensation.

🔧

MCC Retrofit

Replaces outdated capacitor bank stages in Motor Control Centres. Drawer-type cassette fits existing frame without structural modifications.

🏭

Plastics & Textiles

Dynamic injection moulding, extruder and weaving machine loads. Stepless reactive tracking eliminates utility penalties.

🍕

Food & Beverage

Conveyor drives, refrigeration compressors and packaging lines with variable power demand throughout the production shift.

🏗

Crane & Hoist

Rapid reactive swings from crane acceleration and deceleration. GRIDVAR-C tracks the load change in ≤10 ms — faster than any passive system.

💡

Commercial Buildings

Tight electrical rooms with no space for a new switchboard. Wall or drawer mounting allows installation where a standalone cabinet cannot fit.

⚡

Iron & Steel

Rolling mills and auxiliary drives where fast stepless compensation is required but a full GRIDVAR-X investment is not yet justified.

💻

Data Centres

UPS input stages, server room PDUs. Strict harmonic requirements — 2nd–50th filtering with per-order control meets any grid code specification.

☀

Renewables

Solar inverter parks and wind installations requiring reactive power support and harmonic mitigation at the PCC.

Ready to specify GRIDVAR-C for your project?

Our engineering team will size the correct module capacity, mounting configuration and cabinet layout based on your facility's actual load profile — at no cost before commitment.

Documents

Technical documents for this product. Ask for a document still in preparation and we will send it as soon as it is ready.

Request a Quote — GRIDVAR-C

Our engineering team will contact you within 1 business day. Urgent: +90 850 840 64 24

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