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S106-X Datasheet(PDF) 3 Page - Solid State Optronic

Part # S106-X
Description  Zero-Volt Cross Switching
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Manufacturer  SSOUSA [Solid State Optronic]
Direct Link  http://www.ssousa.com
Logo SSOUSA - Solid State Optronic

S106-X Datasheet(HTML) 3 Page - Solid State Optronic

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S106-X
Zero Cross
400V / 0.8A
AC Solid State Relay
S106-X Performance & Characteristics Plots, T
A = 25°C (unless otherwise specified)
ZERO-VOLT SWITCHING
This solid state relay has been designed with a driver circuit that controls the operation of two back-to-back silicon controlled rectifiers
(SCRs), each responsible for one half of the AC cycle. If an AC signal is examined, the turn on, turn off and zero-volt switching can be
seen. Figure 3 shows a typical 60 HZ, 120VAC signal with a corresponding relay input signal:
Figure 3 shows the sequence of zero-volt switching operation. At Stage 1, an input signal is applied to the relay. The relay will not turn
on until the threshold voltage of 5V is reached. Once this point is reached (Stage 2), SCR #1 (designated as the SCR which controls
positive AC voltage) turns on. However, SCR #1 only conducts for an instant, as the cycle quickly crosses zero. At this point (Stage 3),
SCR #1 will turn off and SCR #2 (negative AC voltage) turns on. Likewise, at the next zero cross (Stage 4), SCR #2 will turn off and
SCR #1 conducts again.
Even though the input signal is terminated at Stage 5, the relay will continue to conduct (typical SCR
behavior) until Stage 6, when SCR #1 crosses zero and ceases to conduct. Please note that turn on can likewise begin on the negative
phase of the AC cycle with a -5V threshold, though only the positive phase is shown here.
Figure 3: Zero-Volt Switching Cycle
5V Threshold
(Zero Cross Voltage)
Input Signal
SCR #1 Turns On when
5V threshold is reached
SCR #1 Turns Off,
SCR #2 Turns On
at Zero Volts
SCR #2 Turns Off,
SCR #1 Turns On
at Zero Volts
SCR #1 and Relay
Turn Off at Zero Volts
5
4
2
6
3
1
Relay Input Signal is
Turned On
Relay Input Signal is
Turned Off
Load Signal
0
200
400
600
800
1000
-40
-20
0
20
40
60
80
100
Temperature (ºC)
Figure 2: Maximum Load Current vs.
Temperature
I
F
=5mA
0
10
20
30
40
50
515
520
525
530
535
540
545
550
Blocking Voltage (V
B)
Figure 1: Typical Blocking Voltage Distribution
(N = 100, Ta = 25ºC)
© 2015 Solid State Optronics • San José, CA
www.ssousa.com • +1.408.293.4600
Page 3 of 8
S106-X /H/S/TR
Rev 2.00 (02/27/2015)
002403


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