Siemens SIRIUS 3RH2 Contactor Relay - 6NO + 2NC, 24V DC

This specific model (3RH2262-1BB40) operates with a 24V DC coil voltage.

It features 6 normally open (NO) and 2 normally closed (NC) contacts.

Yes, the auxiliary switches are expandable, allowing you to increase the total pole count from 4 to 8 by adding auxiliary switch modules.

This relay is equipped with screw terminals for secure electrical connections.

The Siemens SIRIUS 3RH2 series holds worldwide certifications including IEC and UL/CSA.

No, this is a contactor relay designed for control circuit signal switching. It is not intended for directly switching motor power loads, which typically require power contactors.

Positively driven operation means that if an NC contact is welded shut, the corresponding NO contact cannot close, and vice-versa. This is a crucial safety feature for certain control applications.

Verify the 24V DC control supply voltage is present at the coil terminals (A1/A2). Check wiring connections for looseness or errors. Ensure the control signal is active.

Ensure the coil is de-energized if it should be open, or energized if it should be closed. Check for any physical obstructions. If the issue persists, the relay may be damaged and require replacement.

Check and re-tighten all screw terminal connections. Ensure the mounting is secure and the relay is properly seated on the DIN rail. Inspect wiring for damage.

Immediately de-energize the circuit. Check terminal tightness, as loose connections are a common cause. Ensure the wire gauge is appropriate for the current being carried. Replace if signs of melting or charring are present.