METAL OXIDE VARISTORS Transient voltage surge suppressors 18D series Part Number Standard High Surge Maximum Allowable Voltage AC DC (V) (V) 18D180L H 11 14 Varistor Voltage V 1.0mA (V) 18(15-21) Clamping Maximum Maximum Voltage Peak current Energy (MAX.) (8/20µs) (10/1000µs) VC IP Standard High Surge Standard High Surge (v) (A) (A) (JOULE) Rated Power Typical Capacitance (Reference) W @1KHz (pf) . 36 7.2 11 23000 18D220K H 14 18 22(20 -24) 43 9.0.