Siemens 3RB3133-4UB0 Solid-State Overload Relay, 50A, Adjust
Siemens SIRIUS S2 solid-state overload relay, 3RB3133-4UB0, 50 A thermal current, adjustable trip class 5E to 30E, 690 V rated insulation voltage.
Specifications
| Parameter | Value |
|---|---|
| Product brand name | SIRIUS |
| Product designation | solid-state overload relay |
| Frame size (overload relay) | S2 |
| Combinable contactor sizes | S2 |
| Reference code (IEC 81346-2) | F |
| Parameter | Value |
|---|---|
| Overload current setting range | 12.5 ... 50 A |
| Trip class | CLASS 5E, 10E, 20E and 30E adjustable |
| Overload release type | electronic |
| Parameter | Value |
|---|---|
| Rated operational current | 50 A |
| Poles (main circuit) | 3 |
| Rated operating frequency | 50 ... 60 Hz |
| Rated insulation voltage (AC, pollution degree 3) | 690 V |
| Rated value (AC-3e), max. | 690 V |
| Rated surge withstand voltage | 6 kV |
| Main current circuit | screw-type terminals |
| Power loss at rated current (hot) | 1.8 W |
| Per pole | 0.6 W |
| Parameter | Value |
|---|---|
| Auxiliary contacts: NO | 1 |
| Auxiliary contacts: NC | 1 |
| Auxiliary contacts: CO (changeover) | 0 |
| Auxiliary switch short-circuit protection (required fuse) | fuse gG: 6 A |
| 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 |
| Parameter | Value |
|---|---|
| Mounting / fastening method | Contactor mounting |
| Mounting position | any |
| Main-circuit connector arrangement | Top and bottom |
| Auxiliary/control circuit connection type | screw-type terminals |
| Removable aux./control terminal | Yes |
| Conductor cross-section: solid | 1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²) |
| Conductor cross-section: solid or stranded | 1x (0,5 ... 4 mm²), 2x (0,5 ... 2,5 mm²) |
| Conductor cross-section: finely stranded with ferrule | 1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²) |
| Parameter | Value |
|---|---|
| Operating temperature | -25 ... +60 °C |
| Storage temperature | -40 ... +80 °C |
| Transport temperature | -40 ... +80 °C |
| Relative humidity, operating | 10 ... 95 % |
| Max. installation altitude | 2 000 m |
| Shock resistance | 15g / 11 ms |
| Parameter | Value |
|---|---|
| Width | 55 mm |
| Height | 99 mm |
| Depth | 104 mm |
Product details
This 3RB3133-4UB0 is a SIRIUS S2 solid-state overload relay for contactor mounting, sized for motor circuits up to 50 A thermal current and 690 V. Its four adjustable trip classes — 5E, 10E, 20E, and 30E — allow matching the relay's trip curve to the motor's acceleration profile: quick for fast-start fans, slow for high-inertia loads. The trip logic operates when the motor current exceeds the upper current setting multiplied by 3.5, and resets when it drops below the lower setting. That gives a defined window for nuisance-tripping avoidance without relying on a separate time delay. The 'tripped' signal contact (97/98) is rated for 2 A and 4 A. Use it for the external status indication the part's note references.
The relay fastens directly to a contactor — no separate bracket. The S2 frame (55 mm wide, 99 mm high, 104 mm deep) fits standard DIN-rail assemblies when mated to the matching contactor. Control terminals accept 0.5 to 4 mm² solid or 2.5 mm² stranded. Use a PZ2 Pozidriv screwdriver with a 5–6 mm shaft diameter for the main terminal screws (M6).
Storage and transport tolerance extends to -40 to +80 °C. The relay withstands 15g / 11 ms shocks per IEC 60068-2-27 and vibration from 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s², 10 cycles. That's enough for most industrial machinery but the signaling contact (97/98) in tripped position is limited to 8g / 11 ms — consider that if the panel sees repetitive shock near the limit.