Siemens 3TH2040-0LB4 40E Contactor Relay
Siemens 3TH2040-0LB4 Contactor Relay (4 NO)
The Siemens 3TH2040-0LB4 is a contactor relay with 40E rating, conforming to EN 50011 standards. It features 4 normally open (NO) contacts and is designed for DC operation with a 24 VDC coil voltage. The relay includes a connected varistor for surge suppression and operates within a voltage range of 0.7 to 1.25 times the nominal operating voltage (US). This unit is a phased-out product, with the SIRIUS 3RH21 series being its successor.
This type of contactor relay is commonly used in control circuits for switching auxiliary functions in motor starters, control panels, and automation systems. Its reliable contact configuration and DC operation make it suitable for various industrial applications where precise and safe switching is required.
Stanlo Automation, a veteran-owned surplus parts distributor, has the Siemens 3TH2040-0LB4 available. Secure this component while supplies last, or explore its successor, the 3RH21, for your automation needs. We are committed to providing quality surplus parts for your industrial applications.
| Type | Contactor Relay |
| Rating | 40E |
| Standard | EN 50011 |
| Contacts | 4 NO |
| Coil Voltage | 24 VDC |
| Operation | DC |
| Surge Suppression | Varistor |