Electromagnetic coil that activates relay switching by generating magnetic field when energized.
A relay coil is an electromagnetic component consisting of insulated copper wire wound around a ferromagnetic core, designed to convert electrical energy into magnetic force when current flows through it. This magnetic field attracts or repels the relay's armature, mechanically actuating electrical contacts to open or close circuits. Coils are precisely engineered with specific resistance, inductance, and voltage ratings to ensure reliable operation within relay systems.
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Overvoltage causes excessive current flow, leading to overheating, insulation breakdown, and eventual coil burnout. This can permanently damage the coil and potentially cause relay failure.
No, AC coils have shading rings to prevent chatter and different impedance characteristics. Using DC coil on AC power causes overheating, while AC coil on DC may not generate sufficient magnetic force.
Power = Voltage² / Resistance for DC coils. For AC coils, consider impedance including inductive reactance. Always refer to manufacturer datasheets for accurate specifications.
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