The Electric Vehicle Conversion Handbook HP1568 by Mark Warner

Author:Mark Warner
Language: eng
Format: epub
Publisher: Penguin Publishing Group
Published: 2011-05-13T04:00:00+00:00

Switches, Relays, and Contactors

To control the flow of electricity in your EV circuits, a number of switches are required. A switch is simply an electrical device that can break a circuit, thereby disrupting the flow of electrical current. For example, a standard room light switch simply “closes” (i.e., makes, or completes) or “opens” (i.e., breaks, or disrupts) the flow of electricity to the room lamp.

All switches have a set of contacts, which can be either switched open or closed. A switch is said to be closed when electrical current can flow, and, conversely is said to be open when the circuit is interrupted. The internal arrangement of the contacts can come in many different types and configurations. The terms pole and throw are often used to describe these contact variations. A pole is a set of contacts and terminals that, when connected, form a single circuit path. A throw is one of two different positions that the switch can be placed in. A single-throw switch has one position that closes the contacts, while a double-throw switch has two positions. These terms are used in abbreviations for the type of switch configurations. The simple on-off room light switch mentioned above would be an example of a single pole, single throw (SPST) switch.

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