SIEMENS
SIEMENS 3RU21261GB0 Overload Relay 4.5-6.3 A Trip Class 10 690 V AC
Thermal overload relay protects motors at 4.5-6.3 A with Trip Class 10 up to 690 V AC
- Thermal overload protection for 4.5–6.3 A motors
- Trip Class 10 limits nuisance tripping
- Rated 690 V AC for industrial supply networks
- Auto and manual reset restores operation quickly
- Direct contactor mounting with screw terminals speeds installation
Overload Relay 4.5-6.3 A Trip Class 10
The SIEMENS 3RU21261GB0 is a thermal overload relay designed to protect three-phase motors from excessive current. It offers an adjustable setting range from 4.5 A to 6.3 A with Trip Class 10 response. The unit mounts directly onto compatible SIRIUS S0 frame contactors for integrated motor starter assemblies.
690 V AC Thermal Protection Limits
This relay operates at a maximum voltage rating of 690 V AC and uses three thermal elements for balanced phase monitoring. Trip Class 10 defines the maximum tripping time under overload conditions. The fixed current range means it cannot protect motors requiring settings below 4.5 A or above 6.3 A.
Direct Contactor Mounting With Screw Terminals
Direct mounting onto the contactor reduces panel space and eliminates separate wiring for the main circuit. Screw terminals provide secure connections for both power and auxiliary circuits. The 1NO/1NC auxiliary contacts allow flexible control circuit signalling for trip and run status indication.
Highlights
- Thermal overload protection for 4.5–6.3 A motors
- Trip Class 10 limits nuisance tripping
- Rated 690 V AC for industrial supply networks
- Auto and manual reset restores operation quickly
- Direct contactor mounting with screw terminals speeds installation
Specifications
| Brand | SIEMENS |
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Questions about this item
Should I choose the 4.5 A minimum or the 6.3 A maximum setting for my motor?
Set the dial between 4.5 A and 6.3 A to match the motor full-load current printed on its nameplate.
What does Trip Class 10 mean when the relay is installed on a running motor?
The relay will trip within 10 seconds at roughly six times the set current, protecting the windings from sustained overload.
How does the 690 V AC rating limit the contactor I can mount this relay on?
The relay fits directly onto a SIRIUS S0 contactor rated up to 690 V AC, so the contactor voltage must not exceed that value.
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