Applies to two or three terminal, four or five layer, thyristor surge protection devices (SPDs) for application on systems with voltages equal to or less than 1000 V rms or 1200 V dc.
ANSI/IEEE C62.37:1996 history
1996ANSI/IEEE C62.37:1996 Standard Test Specification for Thyristor Diode Surge Protective Devices