SIEMENS
SIEMENS 3RU21261DB0 Overload Relay 2.2-3.2A 690V AC Trip Class 10
Thermal overload relay protects motors at 2.2–3.2 A with 690 V AC rating and Class 10 trip
- Thermal protection for 2.2-3.2 A motors
- Trip Class 10 limits nuisance tripping
- 690 V AC rating suits industrial supplies
- Direct contactor mounting saves panel space
- Screw terminals give secure wiring
Motor Protection Relay
The SIEMENS 3RU21261DB0 is a thermal overload relay designed to protect three-phase motors from excessive current. It suits maintenance engineers and panel builders who need reliable overload protection for machinery operating up to 690V AC. The adjustable setting range covers 2.2 A to 3.2 A, matching motors within that full-load current band. Trip Class 10 ensures a standard response time for general-purpose applications.
Direct Contactor Mounting
This unit mounts directly onto compatible SIRIUS contactors in frame size S0, reducing panel space and wiring effort. Screw terminals provide secure connections for both power and auxiliary circuits. The integrated 1NO/1NC auxiliary contact block allows simple signalling to a PLC or indicator light. Auto and manual reset modes give flexibility for different operational procedures after a trip event.
Thermal Trip Characteristics
Thermal operation means the relay reacts to sustained overcurrent rather than instantaneous peaks, so it will not nuisance-trip on normal motor starting inrush. The fixed Trip Class 10 defines the maximum tripping time at 7.2 times the set current, which cannot be altered for faster or slower response. Users requiring electronic precision, remote monitoring or a wider current range must select a different relay technology.
Highlights
- Thermal protection for 2.2-3.2 A motors
- Trip Class 10 limits nuisance tripping
- 690 V AC rating suits industrial supplies
- Direct contactor mounting saves panel space
- Screw terminals give secure wiring
Specifications
| Brand | SIEMENS |
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Questions about this item
What does the Trip Class 10 rating mean for the 3RU21261DB0 overload relay?
Trip Class 10 indicates the relay will trip within 10 seconds at 7.2 times the set current, providing standard protection for motors with normal starting characteristics.
Which contactors can the 3RU21261DB0 mount onto directly?
The relay uses direct-to-contactor mounting on SIRIUS series S0 frame contactors, aligning with the contactor's main terminals for a secure fit.
How do you set the current on the 3RU21261DB0, and what mistake should be avoided?
Adjust the dial to match the motor's full-load amps between 2.2 A and 3.2 A; the common error is setting it to the motor's rated current instead of the actual measured load current.
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