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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Symcom / Littelfuse |
| Manufacturer Product Number | CIO-MB |
| Description | Monitor Accessory; Comm Module; Modbus RTU; 777; IP20/NEMA 1; Inputs 12-24 VDC |
| Datasheet | Download Datasheet |
The Littelfuse SymCom CIO-MB is a communication module (network I/O) for 777 series overload relays, or stand-alone I/O. Protocol: Modbus RTU.
Inputs: 4 general-purpose inputs, 12-24 VDC, 2 mA; remote reset input for a connected 777 (24 VDC normally-open pushbutton). Outputs: 1 SPDT + 1 SPST, 5 A @ 240 VAC.
Power: 24 VDC ±10%, 95 mA max. Consumption: 2.28 W max. Enclosure: IP20, NEMA 1 (finger safe). Mounting: DIN rail or surface mount (two #8 screws). Terminals: Depluggable terminal blocks, 12-20 AWG, 3 in-lb. Dimensions: 86.36 x 25.40 x 138.68 mm (3.40 x 1.00 x 5.46 in), H x W x D with connectors. It operates from -20 to +70 °C. Approvals: UL 508, CSA C22.2, CE.
| Category | |
| Manufacturer | Symcom / Littelfuse |
| Accessory Type | Communication module (network I/O) |
| Compatible With | 777 series overload relays, or stand-alone I/O |
| Communication Protocol | Modbus RTU |
| Inputs | 4 general-purpose inputs, 12-24 VDC, 2 mA; remote reset input for a connected 777 (24 VDC normally-open pushbutton) |
| Contact Configuration | 1 SPDT + 1 SPST |
| Output Rating | 5 A @ 240 VAC |
| Input Voltage | 24 VDC ±10%, 95 mA max |
| Rated Power | 2.28 W max |
| Enclosure Rating | IP20, NEMA 1 (finger safe) |
| Mounting Type | DIN rail or surface mount (two #8 screws) |
| Termination Style | Depluggable terminal blocks, 12-20 AWG, 3 in-lb |
| Dimensions | 86.36 x 25.40 x 138.68 mm (3.40 x 1.00 x 5.46 in), H x W x D with connectors |
| Operating Temperature (Storage) (°C) | -20...+70 |
| Approvals | UL 508, CSA C22.2, CE |