30 Rockwell Automation Publication 1766-UM001I-EN-P - June 2015
Chapter 3 Wire Your Controller
used. See for recommended suppressors. As shown below, these surge
suppression circuits connect directly across the load device.
Suitable surge suppression methods for inductive AC load devices include a
varistor, an RC network, or an Allen-Bradley surge suppressor, all shown below.
These components must be appropriately rated to suppress the switching
transient characteristic of the particular inductive device. See Recommended
Surge Suppressors on page 30 for recommended suppressors.
Recommended Surge Suppressors
Use the Allen-Bradley surge suppressors shown in the following table for use with
relays, contactors, and starters.
+24V DC
IN4004 Diode
Relay or Solid
State DC Outputs
24V DC common
VAC/DC
Out 0
Out 1
Out 2
Out 3
Out 4
Out 5
Out 6
Out 7
COM
(A surge suppressor
can also be used.)
Surge Suppression for Inductive AC Load Devices
Output Device Output DeviceOutput Device
Varistor
RC Network
Surge
Suppressor
Recommended Surge Suppressors
Device Coil Voltage Suppressor Catalog Number Type
(4)
Bulletin 100/104K 700K 24…48V AC 100-KFSC50 RC
110…280V AC 100-KFSC280
380…480V AC 100-KFSC480
12…55 V AC, 12…77V DC 100-KFSV55 MOV
56…136 VAC, 78…180V DC 100-KFSV136
137…277V AC, 181…250 V DC 100-KFSV277
12…250V DC 100-KFSD250 Diode
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