DIP:

Dual-in-line package refers to a component with two rows of PC terminals. The terminals most commonly have pitch of 0.100 and located at 0.30 across the package.

Contact Wipe:

Sliding of one contact on another during actuation of switch.

Double D:

Flat edges on two sides of a cylinder used for orientation and anti-rotation.

Creepage:

The unwanted flow of electrical current from one conductive part to another.

Double Break:

A contact mechanism using two sets of contacts to make or break a given circuit. The contact gap opens twice as fast, reducing the arc duration, contact surface temperature and material erosion. This improves heat dissipation and provides better power handling...