SIEMENS
SIEMENS 3RH21 IEC Control Relay 3NO/1NC 220V DC 10A
IEC control relay with 3NO/1NC contacts, 10 A rating and 220 V DC coil for DIN-rail mounting
- 3NO/1NC contact form enables versatile control circuits
- 220 V DC coil voltage matches industrial panel supplies
- 10 A AC rating at 240 V handles motor starter loads
- 4 W power consumption keeps panel heat low
- IP20 rating and DIN-rail mount suit cabinet installation
SIEMENS IEC Control Relay 220V DC
The SIEMENS 3RH21 IEC control relay switches control circuits in industrial automation panels. It provides three normally open and one normally closed contact rated at 10 A for managing motors, solenoids or auxiliary loads. The unit mounts on DIN rail or directly on a surface and carries an IP20 rating for finger-safe terminals.
Replaces worn IEC relays in existing panels
Install this relay when an older IEC control relay of the same frame size S00 shows contact wear, coil failure or unreliable switching. The jump is worth it when the panel requires a 220V DC coil voltage and the established contact ratings at 24V, 120V, 240V and higher match the circuit design. It fits directly into the Series 3RH21 footprint without rewiring.
Verify coil voltage and contact ratings before
Confirm that the control circuit supplies 220V DC to the coil and that the load currents stay within the listed AC and DC contact ratings for each voltage level. Ensure the enclosure can accommodate the S00 frame size and that screw-terminal wiring matches the panel layout. The maximum operating temperature is 140 Degrees F.
Highlights
- 3NO/1NC contact form enables versatile control circuits
- 220 V DC coil voltage matches industrial panel supplies
- 10 A AC rating at 240 V handles motor starter loads
- 4 W power consumption keeps panel heat low
- IP20 rating and DIN-rail mount suit cabinet installation
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
What DIN rail width and surface mounting options suit the S00 frame size?
The relay mounts on standard DIN rail and can also be surface mounted using its integrated mounting features.
Which terminals accept screw connections for the 220 V DC coil and 10 A contacts?
All coil and contact connections use screw terminals; tighten each terminal to the specified torque to avoid loose connections.
How often should the IP20-rated contacts be inspected given the 4 W coil dissipation?
Inspect contact condition during scheduled panel maintenance; the 10 A rating at 24 V DC and 0.15 A at 600 V DC sets the wear baseline.
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