Understanding Relay Contacts: Normally Open, Normally Closed, and SPDT
177.00 £
Published date: 2025/10/08
- Location: 4020, Greenville, Nebraska, United States
When working with relays, comprehending the different contact types is essential for designing reliable electrical circuits. The three primary relay contact types are open-by-default contacts, closed-by-default contacts, انواع رله and single pole double throw, each serving a distinct role. Picking the correct contact depends on the specific logic required upon energization.
A NO contact is in an open state when the relay is not powered, meaning no current flows through it. When the coil is energized, the contact connects, enabling power transmission. This setup is well-suited for use cases where a device should activate solely under control signal, such as energizing a solenoid via a control signal.
A closed contact operates in the opposite manner. It is conducting when the relay is off, maintaining power delivery.
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