The Siemens 6EW1861-2AC is a power supply unit belonging to the SIROTEC RCM 3S/SINUMERIK 800 series of Siemens. Here are the detailed specifications:
- Manufacturer: Siemens
 - Product Series: SINUMERIK 800
 - Sub - type: SIROTEC RCM 3S power supply
 - Product Type: Power supply
 
- Input Voltage: 230V AC
 - Output Voltage and Current: 5V DC/40A
 
- Weight: Approximately 17 kg
 - Dimensions: Approximately 33.0 cm x 17.8 cm x 50.8 cm (13.0" x 7.0" x 20.0")
 
- The power supply is equipped with two EBM PAPST W2S130 - AA03 - 01 type fans, which help to dissipate heat and ensure the stable operation of the power supply. The main Siemens board reference number is C98040 - A1311 - P2 - 01 - Z186.
 
This power supply is designed to provide a stable 5V DC power output for the SINUMERIK 800 CNC system, ensuring the normal operation of the system's various components.