SIEMENS
SIEMENS 3RU21161DB0 Overload Relay 2.2-3.2A 690V AC
Thermal overload relay protects three-phase motors from 2.2 to 3.2 amps at 690 volts AC with automatic or manual reset
- Protects motors from overheating with 2.2–3.2 A thermal range
- Handles up to 690 V AC for industrial power circuits
- Trip Class 10 gives fast overload response
- Auto and manual reset options restore operation quickly
- Direct contactor mounting with screw terminals speeds installation
SIEMENS 3RU21161DB0 Thermal Overload Relay
This SIEMENS 3RU21161DB0 overload relay protects three-phase motors by monitoring current between 2.2 A and 3.2 A. It fits directly onto SIRIUS S00 contactors for compact panel layouts. The unit suits industrial machinery and automation systems requiring IEC-standard thermal protection. Trip Class 10 ensures a defined response time for typical motor-starting profiles.
Direct Contactor Mounting With Screw Terminals
The relay mounts straight onto the contactor without extra DIN-rail hardware, saving space inside the enclosure. Screw terminals accept standard ferrules or bare wire for secure, tool-friendly connections. One normally-open and one normally-closed auxiliary contact provide status feedback to the control circuit. Auto and manual reset modes let maintenance staff choose the recovery method after a trip.
Thermal Protection Limits At 690V AC
Thermal operation relies on heater elements that respond to sustained overcurrent rather than instantaneous spikes. The fixed 2.2 A to 3.2 A setting range cannot be adjusted beyond these limits, so motors outside this band need a different relay. Maximum rated voltage is 690V AC, restricting use to systems within that insulation class. Three heater elements are included, matching the three-pole power path.
Highlights
- Protects motors from overheating with 2.2–3.2 A thermal range
- Handles up to 690 V AC for industrial power circuits
- Trip Class 10 gives fast overload response
- Auto and manual reset options restore operation quickly
- Direct contactor mounting with screw terminals speeds installation
Specifications
| Brand | SIEMENS |
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Questions about this item
What does the 690V AC maximum voltage rating mean for the relay's application?
The 690V AC rating defines the highest system voltage the relay can safely monitor; it caps use to three-phase networks up to that level.
What contactor frame size and mounting style does the 3RU21161DB0 require?
It mounts directly onto SIRIUS S00 frame contactors using the direct-to-contactor mounting style.
How is the thermal overload relay installed and which reset step is often missed?
Wire the three screw terminals and auxiliary 1NO/1NC contacts, then select auto or manual reset; users often forget to set the reset mode before commissioning.
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