Instruction manual

Load Connection
Zero Cross Function
A SSR with a zero cross function operates when an AC load voltage reaches the zero point or its vicinity. This reduces clicking noises when
the load is switched and minimizes the influence of an inductive load, (e.g., lamp, heater, or motor) on the power supply because the inrush
current of the load is reduced. This can also minimize the scale of the inrush current protection circuit.
 For an AC load, use a power supply rated at 50 or 60 Hz. The maximum operating frequency is 10 Hz.
 The Bulletin 700-SH has a built-in varistor for surge/inrush protection of AC loads. If additional suppression is required, connect an external
varistor across the load device terminals. Select a varistor which meets the load voltage condition outlined in the table below.
Load Voltage [V AC] Varistor Voltage [V] Varistor Surge Resistance
100…120 240…270
1000 A min.
200…240 440…470
380…480 820…1000
Output (load voltage)
Input
ON
OFF
At a low applied voltage (e.g., 24V AC) the load current is not fully supplied. When the unit is switched ON, the voltage required to power the
unit deprives the output signal of the necessary voltage level and thus creates loss time. The lower the load voltage is, the greater the loss
time is. This condition, however, will not create any serious problems.
Loss time
For a DC inductive load, a diode should be connected parallel to the load to absorb the counter electromotive force (OFF) of the load.
SSR
Input
Load
Load power
supply
Note: For additional details when using Solid-State Relays, refer to pub. 700-AT001*, Solid-State Relay Application Guide.
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Approximate Dimensions/ Basic Applications Considerations
9-190
Bulletin 700-SH
Solid-State Relays
67
45
12
27,5
Cat. No. 700-SHCOV
47
27
28,5
Cat. No.700-SHTRMA
www.ab.com/catalogs Preferred availability cat. nos. are b
bold
.
Publication A117-CA001A-EN-P