Surge protective devices (SPD) protect equipment from abnormal voltage caused by lightning.

R5K

SPD for communication/signal/telephone line.

- Two electrode ceramic tube

R5K3

SPD for communication/signal/telephone line

- Three electrode ceramic tube

RHCA3216

SPD for communication/signal/telephone line

- Chip surge absorber

RHCA4532

SPD for communication/signal/telephone line

- Chip surge absorber

RHCA5039/RHCA5639

SPD for AC power supplies

- Chip surge absorber