SIEMENS
SIEMENS 3RU21261HB0 Overload Relay 5.5-8A 690V AC Trip Class 10
Thermal overload relay with 5.5–8 A range, 690 V AC rating and trip class 10 for three-phase motor protection
- Thermal protection for 5.5–8 A motor circuits
- Trip Class 10 limits nuisance tripping
- 690 V AC rating suits industrial supplies
- Direct contactor mounting saves panel space
- Auto and manual reset options simplify recovery
SIEMENS 3RU21261HB0 Thermal Overload Relay
The SIEMENS 3RU21261HB0 is a three-pole thermal overload relay designed for industrial motor protection. It suits maintenance engineers and panel builders who need reliable overload monitoring for three-phase circuits up to 690 V AC.
Direct Contactor Mounting with Screw Terminals
This unit mounts directly onto a compatible SIRIUS contactor in frame size S0, reducing panel space and wiring time. Screw terminals accept standard ferrules, and the built-in 1NO/1NC auxiliary contacts free up separate control-circuit components.
Trip Class 10 for Sustained Overload Response
Trip Class 10 means the relay trips within a defined time under sustained overload rather than on brief inrush. The adjustable 5.5 A to 8 A range lets you match the motor full-load current, while auto and manual reset modes give flexibility after a fault clears.
Highlights
- Thermal protection for 5.5–8 A motor circuits
- Trip Class 10 limits nuisance tripping
- 690 V AC rating suits industrial supplies
- Direct contactor mounting saves panel space
- Auto and manual reset options simplify recovery
Specifications
| Brand | SIEMENS |
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Questions about this item
What is the maximum continuous current the 3RU21261HB0 can handle before the Trip Class 10 protection activates?
The relay trips when current exceeds the 8 A maximum setting, with Trip Class 10 timing defining the response speed under sustained overload.
How much heat does the SIEMENS overload relay generate during all-day operation at full 8 A load?
As a thermal overload device, it dissipates heat proportional to the 5.5–8 A current range; no explicit power-loss figure is published for continuous 8 A duty.
Which contactor frame must I already own to mount this relay directly?
It mounts directly onto SIRIUS Series contactors with Frame Size S0 using the integrated screw terminals.
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