SIEMENS
SIEMENS 3RU21264PB0 Overload Relay 30-36 A 690 V AC Trip Class 10
Protects three-phase motors with a 30–36 A thermal overload range, Trip Class 10, and 690 V AC rating
- Thermal protection for motors up to 36 A
- Trip Class 10 responds quickly to overloads
- Auto and manual reset options for flexibility
- Direct contactor mounting simplifies panel assembly
- Rated for 690 V AC three-phase systems
SIEMENS 3RU21264PB0 Overload Relay
This SIEMENS 3RU21264PB0 overload relay protects three-phase motors by monitoring current between 30 A and 36 A. It mounts directly to a compatible SIRIUS contactor in frame size S0 and includes the required thermal units. The unit suits industrial control panels that need IEC-style thermal overload protection with automatic or manual reset options.
Thermal protection limits at 690 V AC
The relay operates up to 690 V AC and uses a Trip Class 10 characteristic, meaning it trips within approximately 10 seconds at 7.2 times the set current. Screw terminals accept the supply and motor cables for a secure connection. The fixed 30 A to 36 A adjustment range cannot be extended, so the motor full-load current must fall inside this window.
Replaces older thermal overloads with fixed ranges
It upgrades legacy relays that lack direct contactor mounting or that offer only a single current setting. The jump is worth it when the panel uses SIRIUS S0 contactors and the motor current sits between 30 A and 36 A, because the integrated thermal units and dual reset reduce wiring time and spare-part variety.
Highlights
- Thermal protection for motors up to 36 A
- Trip Class 10 responds quickly to overloads
- Auto and manual reset options for flexibility
- Direct contactor mounting simplifies panel assembly
- Rated for 690 V AC three-phase systems
Specifications
| Brand | SIEMENS |
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Questions about this item
Should I choose the 30 A or 36 A setting for my motor?
Set the dial between 30 A and 36 A to match the motor full-load current shown on its nameplate; the relay trips if current exceeds that setting.
What does Trip Class 10 mean when the relay is installed?
Trip Class 10 means the relay will open within roughly 10 seconds at 7.2 times the set current, giving standard protection for general-purpose motors.
How does the 690 V AC rating limit where I can use this relay?
The 690 V AC maximum voltage rating allows use on three-phase supplies up to 690 V; do not apply it on higher-voltage systems.
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