Product Description
The Siemens 3RB3046-2UB0 solid state/electronic overload relay is adjustable from 12.5 to 50 AMPS, has Class 20 tripping characteristic (trips in 20 seconds or less), mounts directly to the load side any 3RT2045-1A, 3RT2046-1A, or 3RT2047-1A 3 pole Sirius contactor and comes with screw terminals. Other features include phase loss protection, an internal power supply which eliminates the need for a 3rd party power source, manual and automatic reset along with a set of normally open and normally closed auxiliary contacts.
| AMP Range | 12.5 to 50 AMPS |
| Trip Class | 20 (10 seconds or less) |
| Phase Loss Protection | Yes |
| Reset | Manual and Automatic |
Click here to view a Adobe PDF file on the 3RB3046 Solid State Overload Relay
The 3RB3046-2UB0 solid-state overload relays up to 50 AMPS with internal power supply have been designed for inverse-time delayed protection of loads with normal and heavy starting against excessive temperature rise due to overload, phase unbalance or phase failure. An overload, phase unbalance or phase failure result in an increase of the motor current beyond the set motor rated current. This current rise is detected by the current transformers integrated into the devices and evaluated by corresponding solid-state circuits which then output a pulse to the auxiliary contacts. The auxiliary contacts then switch off the load by means of the contactors control circuit. The break time depends on the ratio between the tripping current and set current ,Ie and is stored in the form of a long-term stable tripping characteristic.
