The construction of DC relay
Structure composition:
Electromagnetic coil: the wire is wound on the iron core, and the magnetic field is generated after the electricity, which drives the armature action.
Contact system: including normally open (NO), normally closed (NC) and convertible contacts (CO), made of conductive materials, through the armature movement to achieve circuit on-off.
Auxiliary components: such as spring (for reset), iron core (magnetic conductivity), housing (protection), etc., to improve stability and life.
How it works:
Suction state: the coil is energized → the core is magnetized → the armature is attracted → the contact is closed and the circuit is switched on.
Disconnected state: After power off, the magnetic field disappears → the spring returns → the contact is separated, and the circuit is disconnected.
Classification method:
By current type: low power (microelectronics, communication equipment) and high power (power systems, industrial equipment).
By contact type: Single pole single throw (SPST), double pole double throw (DPDT), etc.
By function: time relay (delay control), thermal relay (temperature protection), solid state relay (no contact, long life).
Key features:
High reliability: Simple structure, stable mechanical action, suitable for harsh environments.
Fast response: millisecond switching speed, suitable for automation control scenarios.
Isolation protection: Input and output circuit electromagnetic isolation, improve safety.
Application
Power system: Used for overload protection, short circuit protection and power grid automation control.
Industrial automation: control motor start and stop, valve switch, to achieve production line logic control.
Automotive electronics: lights, air conditioning, Windows and other direct current circuit control.
Communication equipment: signal isolation and conversion to ensure stable operation of equipment.
Household appliances: Power management of washing machines, refrigerators and other equipment.
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