3RB20 Electronic Thermal Relay for Motor Protection | SimplyBuy
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3RB20 Electronic Thermal Relay
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3RB20 Electronic Thermal Relay

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

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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

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Technical Specifications

Size codeTripping classConnection methodModel 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
56 (S6)2 (Class 20)W (Screw connection, 1 pass-through sensor)3RB2056-2WC2
56 (S6)2 (Class 20)X (Cage spring connection, 1 pass-through sensor)3RB2056-2XC2
56 (S6)2 (Class 20)C (Screw connection)3RB2056-2CC2
56 (S6)2 (Class 20)F (Cage spring connection)3RB2056-2FC2

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