Siemens 3TH8040-0B IEC Relay 24VDC Coil Industrial Grade

Siemens 3TH8040-0B is a four-pole IEC control relay with a 24 V DC coil, designed for industrial control panels and automation circuits. This DC-operated relay from Siemens’ 3TH family provides four normally open contact sets in a compact package, with screw terminals for secure field wiring. The device is intended for DC control applications and integrates with standard automation hardware, including PLCs and relay logic. Typical uses include sequencing, interlocking, and motor-control circuits in machine automation, where a single coil must switch multiple circuits. The 3TH8040-0B variant is described in technical listings as a four-pole, 24 V DC coil relay with four normally open contacts, offering DC operation in an industrial-grade enclosure suitable for panel mounting in rugged environments. Because it is a Siemens IEC relay, it is compatible with common control-system architectures and can be wired to multiple circuits controlled by a single coil, reducing wiring complexity while maintaining robust isolation between control and load circuits.