The Siemens CSM 377 (6GK7377-1AA00-0AA0) is a Compact Switch Module designed for connecting SIMATIC S7-300 and up to three additional nodes to Industrial Ethernet. It features an unmanaged switch with four RJ45 ports and supports 10/100 Mbit/s data transfer rates.

Interfaces: 4 RJ45 ports for Industrial Ethernet.

Supply Voltage: 24V DC (external).

Power Consumption: 1.6W.

Operating Temperature: 0°C to 60°C.

Protection Class: IP20.

Dimensions: 40mm × 125mm × 118mm.

Weight: 0.2 kg.

Mounting: S7-300 rail mounting.

LED Diagnostics: Available for monitoring network status.