3RB2056-1FF2 Siemens SIRIUS 3RB2 Electronic Overload Relay, 50–200 A, Size S6
The Siemens 3RB2056-1FF2 is a SIRIUS 3RB2 solid-state overload relay for motor protection, with a current setting range of 50 to 200 A, size S6 and CLASS 10 tripping. Siemens designs it for mounting directly onto a contactor or for stand-alone installation, with busbar connection for the main circuit, spring-type terminals for the auxiliary circuit, and manual or automatic reset. It provides inverse-time protection for motors with normal starting, protecting against overload, phase unbalance and phase failure. Its wide setting range means a few types can cover a whole range of motor ratings.
3RB2056-1FF2 Technical Data
| Specification | Value (Siemens) |
|---|---|
| Product | SIRIUS 3RB2 electronic (solid-state) overload relay |
| Application | Motor protection |
| Size | S6 |
| Current setting range | 50–200 A |
| Trip class | CLASS 10 |
| Mounting | Onto contactor or stand-alone installation |
| Main circuit connection | Busbar connection |
| Auxiliary circuit connection | Spring-type terminals |
| Reset | Manual / automatic |
| Protection functions | Overload, phase unbalance, phase failure |
| Operating frequency | 50–60 Hz |
| Ambient operating temperature | -25 to +60 °C |
| Net weight | Approx. 1.025 kg |
Advantages of Electronic Overload Protection
- Wide setting range: 50–200 A in one device, which reduces the number of variants you need to stock
- Low power loss: less heat in the control cabinet than thermal (bimetal) overload relays
- Phase failure and unbalance protection: fast response to phase loss
- Flexible installation: contactor mounting or stand-alone
- Spring-type auxiliary terminals: quick, vibration-resistant control wiring
- Manual or automatic reset: selectable to suit the application
Typical Applications
- Protection of large pump, fan and compressor motors
- Conveyor and crusher drives
- Motor control centres (MCCs) and starter panels
- Direct-on-line and star-delta starters with size S6 contactors
Buy the 3RB2056-1FF2 Siemens from Atlantech Drives
Atlantech Drives supplies genuine Siemens SIRIUS motor control and protection products to panel builders, OEMs and maintenance teams worldwide, with fast shipping. Contact our commercial team for availability, pricing and lead time on the 3RB2056-1FF2. Request your quote today.
