Siemens 3RB2123-4SB0
MPN3RB2123-4SB0
Overload relay 3...12 A For motor protection Size S0, class 5...30 Contactor mounting Main circuit: screw terminal Auxiliary circuit: screw terminal Manual-Automatic-Reset Internal ground fault detection!!! Phased-out product!!! Successor is SIRIUS 3RB3 Preferred successor type is >>3RB3123-4SB0<<
$96.38Ref. price · indicative, final on quote
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jun 2026
Specifications
Identification
| Parameter | Value |
|---|---|
| Product brand name | SIRIUS |
| Product designation | solid-state overload relay |
| Combinable contactor sizes | S0 |
Protection & Trip
| Parameter | Value |
|---|---|
| Trip class | CLASS 5E, 10E, 20E and 30E adjustable |
Electrical (main circuit)
| Parameter | Value |
|---|---|
| Poles (main circuit) | 3 |
| Rated surge withstand voltage | 6 kV |
| Main current circuit | screw-type terminals |
| Power loss at rated current (hot) | 0.05 W |
Auxiliary contacts
| Parameter | Value |
|---|---|
| Auxiliary contacts: NO | 1 |
| Auxiliary contacts: NC | 1 |
| Auxiliary contacts: CO (changeover) | 0 |
| Switching current at 24 V | 2 A |
| Switching current at 60 V | 0.55 A |
| Switching current at 110 V | 0.3 A |
| Switching current at 120 V | 4 A |
| Switching current at 125 V | 0.3 A |
| Switching current at 220 V | 0.11 A |
| Switching current at 230 V | 3 A |
Connection & Mounting
| Parameter | Value |
|---|---|
| Mounting position | any |
Environmental
| Parameter | Value |
|---|---|
| Relative humidity, operating | 100 % |
| Max. installation altitude | 2 000 m |
| Shock resistance | 15g / 11 ms |
Mechanical
| Parameter | Value |
|---|---|
| Width | 45 mm |
| Height | 73 mm |
| Depth | 75 mm |
Specifications
| Parameter | Value |
|---|---|
| Type Of Protection | PTB 06 ATEX 3001 Ex II (2) GD |
MPN
3RB2123-4SB0