Siemens 3TH2040-0FB4 4 Pole Contactor Relay Assembly

Siemens 3TH2040-0FB4 is a four-pole contactor relay designed for DC control, delivering four normally open main contacts with screw-terminal wiring for secure, field-friendly connections. It carries the 40E coil designation and complies with EN 50011, indicating its suitability for standard industrial control circuits. The device operates with a 24 V DC control coil and draws roughly 1.2 W of coil power, making it a compact, energy‑efficient choice for panel installations. There are no auxiliary contacts beyond the four NO main contacts, simplifying the contact arrangement and reducing potential points of failure. This model is part of the Siemens 3TH20 family and is intended for DC control applications in automation cabinets and machinery where four loads must be switched from a single control signal, offering reliable isolation and switching performance in a compact footprint.