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8. Electric Panel Design
345
Circuit with Diode and Zener
The circuit with diode and zener is suitable when the time to disconnect the circuit with diode is
excessive. As well as the protection circuit with diode, it should only be used in DC voltages. The
zener voltage should be slightly higher than the peak voltage of load
Figure 8-9. Zener diode CKT
Circuit with Varistor
The varistor circuit limits the inductive circuit voltage similarly to a zener diode. Your driving
tension is generally greater than a zener diode and is bi-directional, allowing its use in DC or AC
circuits, where it's used. Should be selected as the maximum voltage source, energy stored in the load
and desired service life.
ATTENTION:
It is imperative the complete reading of the Technical Characteristics of the products used prior to
installation or use thereof. For choosing the type of suppressor to be used, it should be checked the
type of load (DC or AC) and the voltage levels supported by the module chosen for the project
Figure 8-10. Varistor CKT
Circuit with Capacitor
The circuit with capacitor is highly effective to suppress arcs generated during the opening of the
contacts, but can cause wear of contact depending on the charge and discharge current of the
capacitor. For selection of capacitor use the same rule of the RC circuit.
ATTENTION:
This circuit is not recommended in most applications. Should be chosen only when the previous
circuits show themselves inadequate.