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Siemens 3RU Thermal Overload Relays
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Siemens 3RU Thermal Overload Relays

Manufacturer: Siemens
Model: SIRIUS 3RU Thermal Overload Relays
Rated Power: Up to 37 kW
Current Range: 0.11–100 A
Contacts: 1 NO + 1 NC

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Product Description

Siemens 3RU Thermal Overload Relays are advanced protective devices designed for safeguarding motors and electrical loads against overcurrent, phase loss, and phase imbalance. Utilizing bimetallic strip technology, they trigger a trip mechanism when current exceeds preset values, disconnecting the load via auxiliary contacts. These relays feature energy-efficient operation, reduced heat dissipation, and robust construction for industrial environments.

Standard Features

Compatible with contactors (e.g., Sirius S0/S00), they support both AC/DC systems and variable frequency drives (VFDs), ensuring reliable motor protection across automation, HVAC, and machinery applications.

  • Energy Efficiency: 5–10% lower power consumption than previous generations, reducing control cabinet temperatures

  • Bimetallic Trip Technology: Ensures long-term stability and precise current-dependent tripping (Class 10)

  • Wide Temperature Range: Operates from -40°C to +70°C, suitable for harsh conditions

  • Dual Reset Options: Manual or automatic reset after cooldown (≈10 minutes)

  • Compact Design: 45 mm width with spring-clamp or screw terminals (up to 10 mm²)

  • Phase Protection: Integrated differential slider for phase loss/asymmetry detection

  • High Compatibility: Works with Sirius contactors and VFDs

Technical Specifications

ModelRated Current (A)Applicable contactor
3RU21 16-0AB0

0.11-0.16

 3RT20 1
3RU21 16-0BB00.14-0.2
3RU21 16-0CB00.18-0.25
3RU21 16-0DB00.22-0.32
3RU21 16-0EB00.28-0.4
3RU21 16-0FB00.35-0.5
3RU21 16-0GB00.45-0.63
3RU21 16-0HB00.55-0.8
3RU21 16-0JB00.7-1
3RU21 16-0KB00.9-1.25
3RU21 16-1AB01.1-1.6
3RU21 16-1BB01.4-2

3RU21 16-1CB0

3RU21 26-1CB0

1.8-2.53RT20 2

3RU21 16-1DB0

3RU21 26-1DB0

2.2-3.2

3RU21 16-1EB0

3RU21 26-1EB0

2.8-4

3RU21 16-1FB0

3RU21 26-1FB0

3.5-5

3RU21 16-1GB0

3RU21 26-1GB0

4.5-6.3

3RU21 16-1HB0

3RU21 26-1HB0

5.5-8

3RU21 16-1JB0

3RU21 26-1JB0

7-10

3RU21 16-1KB0

3RU21 26-1KB0

9-12.5

3RU21 16-4AB0

3RU21 26-4AB0

3RU21 36-4AB0

11-16

3RU21 26-4BB0

3RU21 36-4BB0

14-20

3RU21 26-4CB0

3RU21 36-4CB0

17-22

3RU21 26-4DB0

3RU21 36-4DB0

20-25

3RU21 26-4EB0

3RU21 36-4EB0

22-32

3RU21 26-4FB0

3RU21 36-4FB0

28-40

3RU21 26-4NB0

23-28
3RU21 26-4PB030-36

 

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