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Current Limiting Reactors — NKL Cement / FKL Split Reactors
Current limiting reactors limit short-circuit current in power systems to protect switchgear and reduce fault stress. The NKL cement-type (concrete) reactor and FKL split reactor are air-core, dry-type units rated 6–35 kV with 4–12% reactance, designed for substations, generator circuits, and capacitor bank inrush limiting.
Applications
Substation short-circuit current limitation
Generator and motor feeder protection
Capacitor bank inrush limiting
Industrial plants with high fault levels
Key Features
- Air-core dry-type construction with cement (NKL) or split (FKL) winding
- Limits short-circuit current to protect downstream switchgear
- 6–35 kV class with 4–12% reactance ratings
- Low loss and high linearity over the current range
- Split reactor (FKL) couples two sections for mutual benefit
- Custom reactance and current ratings available
Selection Guide
Reactance
Calculate the required % reactance to bring fault current within breaker rating.
Type
Choose NKL cement for single circuits or FKL split for two coupled circuits.
Voltage
Match the 6–35 kV system voltage and continuous current rating.
- Frequently Asked Questions
What is a current limiting reactor?
A current limiting reactor is an air-core inductive device inserted in series to reduce the prospective short-circuit current, protecting circuit breakers and equipment from excessive fault stress.
What is the difference between NKL and FKL?
NKL is a cement (concrete) insulated single reactor; FKL is a split reactor whose two halves are magnetically coupled, used where two circuits can share the current-limiting function.
How is reactance expressed?
As a percentage of the base impedance (commonly 4–12%), which determines the fault-current reduction for the system.
Instant Selection & Quote Calculator
Select your specifications to get an estimated price instantly.
| Base price (interpolation) | $69 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Complete equipment — no winding copper linkage
Reference prices are for estimation only and do not constitute a formal offer.
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