Form C:

A single pole, double throw contact or SPDT.

IEC:

International Electrotechnical Commission

Form Z:

A two circuit double break switch such as a Single Pole Double Throw Double Break switch.

IECQ:

IEC’s Quality Assessment system for Electronic Components, created in 1983 to facilitate national and international trade in certified electronic components. A worldwide certification system which provides a method whereby electronic components made and handled by...