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Select by Relays
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   Relays  Type  AC Rate  DC Rated  Inputs  Counters  Control  Daisy Special Features
IA-3302  2  SPST 5A 115V 5A 30V  2 + 2  ---  RS-232  no  Isolated + Non Isolated  Inputs, DIN Rail
IA-2122-U   2 SPDT  8A 240V  8A 30V   2  ---  USB  no 2-ch Isolated Digital Inputs + 2-ch SPDT Relay 
IA-2522-U  2  SPDT  0.4A 125V 2A 30V  3  3  USB  no  Compact sized and moderate priced  
IA-2104-U  4  SPDT  8A 240V  8A 30V  ---  ---  USB  no  USB powered and controlled 
IA-3304-U 4  SPST ---  2A 30V  4 ---  USB  no  4-ch Opto-Isolated Digital Inputs 
IA-3308-U  8  SPST  --- 2A 30V ---  ---   USB no  Small Footprint 8 Relays Solution 
IA-3011-5  8 SPDT  0.5A 120V 1A 24V   8  ---  Digital  no  TTL to Relays, Isolated 5-24VDC to TTL
IA-3088-2  8 SPST  5A 250V 5A 30V   8  1  RS-232  yes  Local CTL Panel, Daisy-chain & Peer-to-Peer 
IA-3088-5  8  SPST  5A 250V 5A 30V  8  1  RS-485  yes  Local Panel for CTL and Status, DIN Rail
IA-3135-2  8 SPDT      8  ---  RS-232  yes  Isolated or Non Isolated Inputs
IA-3136-2  8+1 SPDT  8A 240V 8A 30V  8  ---  RS-232  yes  Isolated NPN and PNP devices support
IA-2116-U  16  SPDT  ---  1A 30V  ---  ---  USB  no  Small Footprint
IA-3126-2  16  SPST  0.5A 120V  2A 24V  16  ---  RS-232  yes  5 to 30VDC Digital Input Range
IA-3137-2  16  SPST 16A 240V 16A 24V  2  ---  RS-232  yes  90 to 240VAC Digital Inputs option
 IA-3137-U  16 SPST  16A 240V   16A 24V  2  ---  RS-232  yes  USB 16-ch 16Amp Power Relay Controller 
 IA-3138-2  16  SPDT 8A 240V  8A 30V   2  --- RS-232   yes 16-ch Power SPDT Relay, 2-ch Isolated Input 
IA-3154-2  24   DPDT 0.5A 120V  2A 24V   ---  ---   RS-232  yes 'Break before Make" option, Complete DPDT
IA-3127-U 24  SPST 0.5A 120V  2A 24V   24  ---  USB   yes 24 Relays & 24 Digital Inputs, small footprint
IA-3121-2  32  OD  --- 1A 30V  ---  ---  RS-232  yes  Solid State Relays, Long operation Life
IA-3131-2  32 SPST 0.5A 120V 2A 24V   ---  ---  RS-232  yes  High density simple operation solution
IA-3131-U  32 SPST  0.5A 120V  2A 24V   --- ---  USB   yes**  USB Interface for an RS-232 Daisy-chain 
IA-3155-2  32  DPDT 0.5A 120V 2A 24V  ---   --- RS-232  yes

 High density simple operation solution