Resistance, inductance, impedance, and reactance refer to the article on coil parameters. For a complete discussion of the coil parameters of The customer might sometimes ask for impedance when he/she really means the resistance. Terms resistance and impedance are often used interchangeably but technically The coil voltage/current ratings and resistanceĪre specified on drawings and data sheets. It is generally not a controlledĬharacteristic for the coil design. Inductance is typically not specified on valve Switch (Transistor or MOSFET) is used this voltage transient can result in over-voltageįailure of the solid-state switch if it’s not protected. This arcingĬan result in degradation and eventual failure of the contact. Generated across the contact that can reach several hundred volts. Voltage is disconnected by a switch contact or a relay contact, an arc is The need for arc suppression devices to be placed across the coil. Voltage transient when the coil is suddenly switched off, often resulting in The inductance of the solenoid valve coil causes a
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