3RB20 Electronic Thermal Relay
3RB20 Electronic Thermal Relay
Product Specifications
Manufacturer: SIEMENS
Module: 3RB20 Electronic Thermal Relay
Matching Size: 56 [S6]
Trip Class: 1 [10 Class] 2 [20 Class]
Rated Current: 50-200A
Wiring Method: W: Screw connection, 1 pass-through sensor X: Cage spring connection, 1 pass-through sensor C: Screw connection F: Cage spring connection
Product description
The SIRIUS 3RB20 is a robust electronic overload relay designed for direct mounting on 3‑pole contactors (3RT series) or standalone use. It protects three‑phase motors (50/60 Hz) by detecting overloads, phase failures, and asymmetry. With an internal power supply and low power loss, it ensures compact, efficient, and reliable motor protection in industrial control panels.
Standard Features
Rated Current: 100 A (AC-3), motor power up to 55 kW
Control Voltage: 230 V AC coil, supports frequent switching
Contacts: Built-in 1 NO + 1 NC auxiliary contacts
Mounting: DIN rail or screw panel installation
Durability: Up to 10 million mechanical operations
Standards: IEC 60947-4-1, CE, EAC certified
Compact: Space-saving design for easy wiring
Technical Specifications
| Size code | Tripping class | Connection method | Model name |
|---|---|---|---|
| 56 (S6) | 1 (Class 10) | W (Screw connection, 1 pass-through sensor) | 3RB2056-1WC2 |
| 56 (S6) | 1 (Class 10) | X (Cage spring connection, 1 pass-through sensor) | 3RB2056-1XC2 |
| 56 (S6) | 1 (Class 10) | C (Screw connection) | 3RB2056-1CC2 |
| 56 (S6) | 1 (Class 10) | F (Cage spring connection) | 3RB2056-1FC2 |
