© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Communication Modules
www.littelfuse.com/ciomb-cio120mb
Rev: 1-A-062716
CIO-MB/CIO-120-MB
Description
The CIO-MB/CIO-120-MB Modules are convenient and
cost-effective Modbus-RTU interfaces capable of providing
discrete control and monitoring of an overload relay over a
Modbus network.
Features & Benefits
FEATURES BENEFITS
Compact size
3.46” H x 1.0” W x 5.0” D
Easily adapts to existing as well as
new applications
Flexible addressing
standard allows function
as stand-alone interface
or in conjunction with
777 series overload relay
Provides flexibility for control and monitoring
Remote reset option
Additional remote reset input allows user to reset
777 series relays without opening the panel
DIN rail or surface
mountable
Allows installation flexibility
Unpluggable terminal
block connections
Allows user to wire terminal blocks before installing
the module and reduces field wiring
Specifications
Functional Specifications
Remote Reset (for use with
optional 777 Series) Normally open pushbutton rated 24VDC,
10mA (min.)
Power Requirements:
Voltage 24VDC +10%
Current 95mA (max.) 70mA (typical)
Power 2.28 W (max.) 1.7 W (typical)
Ethernet Controller IEEE 802.3
Capability 10Base-T
Input Characteristics
General Purpose (4)
Voltage Range:
CIO-MB 12-24VDC
CIO-120-MB 90-130VAC
Current 2mA (typical)
Output Characteristics
SPDT (1), SPST (1)
Pilot Duty 480VA & 240VAC, B300
General Purpose 5A @ 240VAC
General Characteristics
Ambient Operating
Temperature -20° to 70°C (-4° to 158°F)
Terminal (depluggable
terminal block)
Torque 3 in.-lbs. (max.)
Wire AWG 12-20 AWG
Class of Protection IP20, NEMA 1 (finger safe)
Relative Humidity 10-95%, non-condensing per IEC 68-2-3
Communication link to PLC/SCADA/
monitoring systems
Ordering Information
MODEL LINE VOTAGE
CIO-MB
12 to 24VDC
CIO-120-MB
90 to 130VAC
FIGURE 1: Typical Wiring Diagram (CIO-MB)
FIGURE 2: Typical Wiring Diagram (CIO-120-MB)
Wiring Diagram
TYPICAL WIRING FOR CIO-MB
TYPICAL WIRING FOR CIO-120-MB
