Siemens 5SX21-D0.5 Overload Relay

The Siemens 5SX21-D0.5 overload relay is a thermal protection device with a 0.5 A nominal rating and a 230/400 V operating voltage. It belongs to Siemens' 5SX protection family and is designed for use in motor control circuits in combination with a compatible contactor to trip the circuit when overload conditions arise. Verified specifications include a current rating of 0.5 A and a voltage range of 230/400 V AC. In operation, it monitors current and activates the contactor coil to disconnect power if overheating or overload is detected, helping to prevent motor damage and electrical faults in control panels. Suitable for installation in industrial panels where Siemens 5SX components are used together, it provides a compact, plug-in option for motor protection within standard control schemes.