Examples of Relays and Relay Contacts

To accurately interpret electrical system diagrams and schematics, it's essential to understand the condition or state of each component. In electrical schematics that detail individual relays and contacts, components are typically shown in their de-energized condition (also known as the shelf-state).

Each relay is assigned a specific number and/or letter combination to associate it with the contact(s) it operates. This code is used for all related contacts. For example, a schematic might show a coil labeled (M1) and its corresponding contact. If space allows, a dashed line (indicating a mechanical connection) or a dashed box around them may emphasize this relationship. Additionally, diagrams may illustrate a switch and a set of contacts that the switch operates.