• Siemens SIRIUS 3RB20 Electronic Overload Relays (S6–S12, up to 630 A)
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Siemens SIRIUS 3RB20 Electronic Overload Relays (S6–S12, up to 630 A)

Siemens SIRIUS 3RB20 Electronic Overload Relays (S6–S12, up to 630 A)

SIRIUS 3RB20 electronic overload relays with internal power supply protect large motors from 50 A to 630 A in sizes S6 to S12.

Key features

  • Setting ranges 50-200 A, 55-250 A and 160-630 A
  • Fixed trip class 10E or 20E
  • Busbar connection or straight-through transformer versions
  • For mounting on contactors and stand-alone installation
  • Auxiliary contacts 1 NO + 1 NC, manual/automatic RESET, TEST and self-monitoring

Specifications

Product line SIRIUS 3RB2
Aux. contacts 1 NO + 1 NC
Power supply Internal
Brand Siemens
Catalog section IC 10 ch. 7 Protection equipment
Category Electronic Overload Relays
Poles 3
Rated frequency 50/60 Hz
Source Siemens Catalog IC 10 · 2026, p. 7/99-7/101
3RB2056-1FC2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2056-1FF2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2056-1FW2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Straight-through transformer | Connection: Screw (aux. circuit)
3RB2056-1FX2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Straight-through transformer | Connection: Spring-loaded (aux. circuit)
3RB2066-1GC2 Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 10E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-1GF2 Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 10E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2066-1MC2 Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 10E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-1MF2 Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 10E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2056-2FC2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2056-2FF2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2056-2FW2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Straight-through transformer | Connection: Screw (aux. circuit)
3RB2056-2FX2 Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Straight-through transformer | Connection: Spring-loaded (aux. circuit)
3RB2066-2GC2 Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 20E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-2GF2 Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 20E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2066-2MC2 Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 20E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-2MF2 Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 20E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
Electronic Overload RelaysSiemens
16 product codes available in this family
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Siemens SIRIUS 3RB20 Electronic Overload Relays (S6–S12, up to 630 A)

Brand Siemens·Electronic Overload Relays

Available part numbers (16)

3RB2056-1FC2, 3RB2056-1FF2, 3RB2056-1FW2, 3RB2056-1FX2, 3RB2066-1GC2, 3RB2066-1GF2, 3RB2066-1MC2, 3RB2066-1MF2, 3RB2056-2FC2, 3RB2056-2FF2 + 6 more — see full table ↓

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Product codeSpec
3RB2056-1FC2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2056-1FF2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2056-1FW2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Straight-through transformer | Connection: Screw (aux. circuit)
3RB2056-1FX2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 10E | Version: Straight-through transformer | Connection: Spring-loaded (aux. circuit)
3RB2066-1GC2Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 10E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-1GF2Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 10E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2066-1MC2Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 10E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-1MF2Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 10E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2056-2FC2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2056-2FF2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2056-2FW2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Straight-through transformer | Connection: Screw (aux. circuit)
3RB2056-2FX2Size: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Class: 20E | Version: Straight-through transformer | Connection: Spring-loaded (aux. circuit)
3RB2066-2GC2Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 20E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-2GF2Size: S10/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Class: 20E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)
3RB2066-2MC2Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 20E | Version: Busbar connection | Connection: Screw (aux. circuit)
3RB2066-2MF2Size: S10/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Class: 20E | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)

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