The relays of the SB47x series monitor the secondary circuits of welding transformers for fault voltages. A total of six secondary circuits can be monitored. The versions SB473 and SB476 can be linked for common alarm messages.

• Voltage monitoring of 1, 3 or 6 secondary circuits of welding transformers
• One common alarm from several SB47x devices
• Alarm LEDs for fault voltage per channel, PE/KE interruption interruption of the measuring line
• Connection monitoring of measuring line and earth connection

• Monitoring of welding equipment