Siemens 3RB2153-4FF2 SIRIUS Thermal Overload Relay - 50-200A
Siemens 3RB2153-4FF2 High-Capacity Overload Relay with Ground Fault Detection.
The Siemens 3RB2153-4FF2 is a high-capacity thermal overload relay from the SIRIUS 3RB21 series, designed for heavy-duty motor protection. It offers a wide adjustable current range of 50 to 200 A and is suitable for Size S6 contactors or stand-alone installations. This relay features adjustable trip class settings from 5 to 30E and includes internal ground fault detection for enhanced safety. It is equipped with busbar connections for the main circuit and spring-type terminals for the auxiliary circuit, supporting manual or automatic reset.
This robust overload relay is ideal for protecting large industrial motors in demanding applications such as large pumps, industrial fans, compressors, and heavy processing machinery. Its features make it suitable for use in industries like mining, chemical processing, power generation, and large-scale manufacturing where reliable protection of high-power equipment is critical.
Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RB2153-4FF2 overload relay. Ensure your critical industrial assets are protected with high-quality surplus components from Stanlo, delivered with speed and reliability.
| Type | Thermal Overload Relay |
| Current Range | 50-200 A |
| Size | S6 |
| Protection Class | Class 5-30E |
| Ground Fault Detection | Internal |
| Mounting | Contactor Mounting / Stand-alone |
| Main Circuit Terminals | Busbar |
| Auxiliary Circuit Terminals | Spring-type |
| Reset | Manual/Automatic |