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| Custom power devices (CPDs) | Applications/functions |
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| Distribution static synchronous compensator | Current harmonics, power factor, load voltage/current balancing, and flicker. |
| Active power filter | Harmonic distortion and transient. |
| Interline power flow controller | Transient, damping oscillation, voltage control, and reactive power flow control. |
| Dynamic voltage restorer | Voltage balancing, voltage sags/swells, flicker, and voltage regulation. |
| Static current limiter solid-state circuit breaker | Disconnects the faulted circuit and fault current limitation. |
| Solid-state transfer switch | Voltage sag/swell and transmitting power from another feeder. |
| Static synchronous series compensator | Fault current limitation, control of current, and active/reactive power. |
| Static VAR compensator | Flicker and unsymmetrical loads. |
| Static synchronous compensator | Transient, damping oscillation, and voltage fluctuation/flicker. |
| Surge arrester | Overvoltage and transient. |
| Unified power flow controller | Voltage and active/reactive power control, fault current limitation, and transient. |
| Uninterruptible power supply | Emergency power shortage. |
| Unified power quality conditioner | Voltage/current balancing, voltage sags/swells, harmonics, power factor, fluctuations, and harmonic load current. |
| Transient voltage surge suppressors | Voltage transient. |
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