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DST Line Reactors

Three-Phase Line Reactors DST

Even the most expensive, modern variable frequency drive (VFD) is vulnerable to the surprises of an industrial power grid. Sharp voltage surges, phase imbalance, and nearby heavy equipment can disable an inverter in an instant. To protect the power electronics and eliminate plant downtime, a line reactor (input choke) must be installed at the VFD input.

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Three-Phase Line Reactors DST
Three-Phase Line Reactors DST
Why It's Needed

Why Is an Input Line Reactor Needed?

A line reactor is installed in the circuit between the supply network and the frequency converter. In essence, it's an inductive shock-absorbing filter that provides two-way protection.

  • Protects the Inverter from Line SurgesThe reactor limits the rate of current rise during voltage spikes, saving the VFD's rectifier bridge and capacitors from breakdown and preventing an 'Overvoltage' fault.
  • Protects the Network from VFD HarmonicsEffectively reduces total harmonic distortion (THDi), protecting the supply transformer from overheating and sensitive equipment from malfunctions.
  • Levels Out Phase ImbalanceSmooths line currents during minor supply voltage asymmetry, preventing emergency equipment shutdowns.
Catalog

Three-Phase Line Reactors DST

Models rated from 10 A to 700 A for 380 V networks, including direct replacements for the RK series reactors.

Three-Phase Line Reactor DST-380-10-2.94

Three-Phase Line Reactor DST-380-10-2.94

Compact input choke for low-power VFDs.

Rated current: 10 A
Rated voltage: 3×380 V
Inductance: 2.94 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-16-1.84

Three-Phase Line Reactor DST-380-16-1.84

For low- to medium-power drives.

Rated current: 16 A
Rated voltage: 3×380 V
Inductance: 1.84 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-25-0.5

Three-Phase Line Reactor DST-380-25-0.5

Direct replacement for the RK-0525 reactor.

Rated current: 25 A
Rated voltage: 3×380 V
Inductance: 0.5 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-40-0.5

Three-Phase Line Reactor DST-380-40-0.5

Direct replacement for the RK-0548 and RK-05410 reactors.

Rated current: 40 A
Rated voltage: 3×380 V
Inductance: 0.5 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-50-0.2

Three-Phase Line Reactor DST-380-50-0.2

Direct replacement for the RK-02510 and RK-05510 reactors.

Rated current: 50 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-60-0.2

Three-Phase Line Reactor DST-380-60-0.2

Direct replacement for the RK-02612 reactor.

Rated current: 60 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-75-0.2

Three-Phase Line Reactor DST-380-75-0.2

Direct replacement for the RK-02715 reactor.

Rated current: 75 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-100-0.2

Three-Phase Line Reactor DST-380-100-0.2

Direct replacement for the RK-021020 reactor.

Rated current: 100 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-130-0.2

Three-Phase Line Reactor DST-380-130-0.2

Direct replacement for the RK-021326 reactor.

Rated current: 130 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-160-0.2

Three-Phase Line Reactor DST-380-160-0.2

Direct replacement for the RK-021632 reactor.

Rated current: 160 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-250-0.2

Three-Phase Line Reactor DST-380-250-0.2

Direct replacement for the RK-022550 reactor.

Rated current: 250 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-300-0.2

Three-Phase Line Reactor DST-380-300-0.2

Direct replacement for the RK-023060 reactor.

Rated current: 300 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-400-0.2

Three-Phase Line Reactor DST-380-400-0.2

Direct replacement for the RK-024080 reactor.

Rated current: 400 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-500-0.2

Three-Phase Line Reactor DST-380-500-0.2

Direct replacement for the RK-0250100 reactor.

Rated current: 500 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-600-0.2

Three-Phase Line Reactor DST-380-600-0.2

Direct replacement for the RK-0260120 reactor.

Rated current: 600 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
Three-Phase Line Reactor DST-380-700-0.2

Three-Phase Line Reactor DST-380-700-0.2

Direct replacement for the RK-0270140 reactor.

Rated current: 700 A
Rated voltage: 3×380 V
Inductance: 0.2 mH
Country of origin: Bulgaria
Warranty: 12 months
On request
Order
When Installation Is Mandatory

When Installing a Line Reactor Is Strictly Required

  • Transformer powerExceeds the VFD power by 10 times or more
  • Nonlinear loadsPowerful nonlinear loads (thyristor drives, welding machines, arc furnaces) are connected to the same line
  • Reactive power compensationA power factor correction system is installed that could cause resonance
  • Unstable networkThe network regularly experiences brief voltage dips or surges
  • Phase countSingle-phase (220 V) or three-phase (380 V) — depends on your VFD's power type
  • Rated currentThe reactor's rated current should equal or slightly exceed the VFD's maximum input current — an oversized reactor reduces filtering effectiveness
  • Voltage dropThe optimal impedance for industrial networks is 2–4%
Why DETZ

Why It Pays to Buy a Reactor from DETZ

A line reactor costs just 3-5% of the price of a frequency converter, while its absence can cost tens of times more in repairs and line downtime.

Professional Sizing
Large Stock
Certified Quality
Delivery Across Ukraine
Copper/Aluminum Winding
Same-Day Dispatch

Contact us to order a reactor

Leave a request and our engineers will help you select the right three-phase DST line reactor with the ideal inductance for your frequency converter, free of charge.

Our contacts

Working hours: Mon – Fri, 08:30 to 17:30. Orders via the website are accepted 24/7.

Email: info@electromotor.dp.ua

Our other websites:
VEICHI Bulgaria — Veichi Electric frequency inverters
DETZ — Industrial electrical equipment