Siemens SIRIUS Bimetal Relay – 12.5…20 A, Size S1, Class 10 – 3US5200-2B8K
The Siemens 3US5200-2B8K is a SIRIUS thermal overload relay (bimetal type) designed for reliable protection of three-phase motors against overload, phase failure, and excessive heating. It is widely used in industrial motor starter assemblies to ensure safe operation and long service life of electrical motors.
This relay belongs to Size S1 and provides an adjustable current range of 12.5 to 20 A, making it suitable for medium-duty motor applications. With a Class 10 tripping characteristic, it ensures fast disconnection during overload conditions, helping prevent motor winding damage and system failure.
It is designed for direct mounting with Siemens SIRIUS contactors, ensuring compact installation in motor control panels, MCCs, and OEM machinery systems.
Key Features
• Siemens SIRIUS bimetal thermal overload relay
• Adjustable current range: 12.5 – 20 A
• Size S1 compact design
• Class 10 tripping characteristic (fast motor protection)
• Phase failure protection for motor safety
• Direct mounting with SIRIUS contactors
• Manual/automatic reset option (depending on setup)
• Screw terminal connection for secure wiring
• Proven bimetal thermal sensing technology
• Suitable for industrial motor protection systems
Technical Specifications
|
Parameter |
Specification |
|
Product Model |
3US5200-2B8K |
|
Brand |
Siemens |
|
Series |
SIRIUS 3US |
|
Type |
Thermal Overload Relay (Bimetal) |
|
Current Range |
12.5 – 20 A |
|
Size |
S1 |
|
Tripping Class |
Class 10 |
|
Protection Functions |
Overload + Phase failure protection |
|
Mounting Type |
Contactor mounting (SIRIUS system) |
|
Reset Type |
Manual / Automatic (variant dependent) |
|
Connection Type |
Screw terminals |
|
Application |
Motor protection |
|
Operating Principle |
Thermal bimetal expansion |
|
Standards |
IEC 60947-4-1 |
|
Product Status |
Active |
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