SIEMENS
SIEMENS 3RU21161JB0 Overload Relay 7-10A 690V AC
Thermal overload relay protects three-phase motors from 7 A to 10 A at 690 V AC with automatic or manual reset
- Thermal overload protection for motors up to 10 A
- 690 V AC rating suits industrial three-phase supplies
- Trip Class 10 gives standard response to sustained overcurrent
- Auto and manual reset options restore operation quickly
- Direct contactor mounting with screw terminals simplifies panel wiring
Application & fit
The SIEMENS 3RU21161JB0 is a thermal overload relay rated for three-phase circuits up to 690V AC. It protects motors drawing between 7 A and 10 A and mounts directly onto a compatible SIRIUS contactor in frame size S00. The unit includes the required thermal elements and offers both automatic and manual reset modes for flexible restart policies.
Sustained-load behaviour
Trip Class 10 means the relay opens within a defined time band when current exceeds the set point continuously, limiting temperature rise during prolonged overloads. The 1NO/1NC auxiliary contacts change state at the same moment, giving a clean signal to control circuits without contact bounce. Screw terminals maintain clamping force through thermal cycling, so the protection threshold stays consistent over long service intervals.
Build & daily use
Direct-to-contactor mounting eliminates separate DIN-rail hardware and keeps the starter footprint compact inside the panel. Three-pole construction with screw terminals allows straightforward wiring with standard hand tools, and the IEC relay style matches common European motor-control layouts. The relay is supplied new and carries no NEMA size designation, so installers should verify dimensional compatibility with the chosen contactor before assembly.
Highlights
- Thermal overload protection for motors up to 10 A
- 690 V AC rating suits industrial three-phase supplies
- Trip Class 10 gives standard response to sustained overcurrent
- Auto and manual reset options restore operation quickly
- Direct contactor mounting with screw terminals simplifies panel wiring
Specifications
| Brand | SIEMENS |
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Questions about this item
How much heat does the 3RU21161JB0 generate when running at 10 A all day?
The relay uses thermal overload protection rated for a maximum current setting of 10 A and a 690 V AC maximum voltage. Trip Class 10 defines its heating-time response under sustained load.
What contactor must I already own to mount this overload relay directly?
It mounts directly to a compatible SIRIUS series contactor with frame size S00 using screw terminals for the main circuit connections.
Will the 7-10 A setting range cover the motor I already run on an older starter?
The adjustable range spans 7 A minimum to 10 A maximum with three included thermal units. It provides 1NO/1NC auxiliary contacts for control circuits on three-phase loads.
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