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of
38
Figure 2.
Example of a “snubber” circuit
To calculate the appropriate capacitor C
in microfarads [µF] and resistor R in ohms [Ω] to use in the “snubber” circuit, Paktron
Capacitors’ Quencharc® technical note
1
suggests the following empirical equations
𝐶 =
𝐼
2
10
(1), and
𝑅 =
𝐸
10𝐼(1+
50
𝐸
)
(2),
where
I
is the load current prior to contact opening in amperes [A] and
E
is the source voltage in volts [V]. For example, if
Figure 2
shows a 0.1 A LOAD with a 110 V AC source connected in series with the Terranova® relay,
I
= 0.1 A and
E
= 110 V AC. Therefore,
Equation 1 provides a capacitance value of 0.001 µF; Equation 2 provides a resistance value of approximately 76
Ω. Thus, a 0.
001 µF
capacitor and a 100
Ω resistor
should be used
for the “snubber” circu
it. However, user must take into consideration the voltage and
power rating of the capacitor and resistor, respectively, to meet the requirements of the circuit. Similar protective circuits or
components should be considered to suppress current spikes in capacitive loads.
1.
Pancon Corporation.
‘2012 Catalog’. 2012. 18
-19. Web.
http://www.panconcorp.com/PDFs/Catalogs/Paktron_2012catalog.pdf
