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Overload Relays Relay, Solid State/Selectable Trip Class; 3 Pole; 1NO 1NC; 50 FLA
SIEMENS #3RB3143-4UB0

Sirius Relay, Solid State/Selectable Trip Class; 3 Pole; 1NO 1NC; 50 FLA

SKU # 80476634483 Manufacturer Series: 3RB3
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Type: Solid State, Selectable Trip Class
Mounting: Contactors
Size, IEC: S3
Reset: Manual/Automatic
Ambient Temperature: Compensated
Poles: 3
Motor FLA: 50A
Auxiliary Contacts: 1NO 1NC
Rating, Contacts: 3A/230VAC, 0.11A/220VDC
Enclosure: IP20, IP00

The 3RB31 solid-state overload relays up to 40A with internal power supply have been designed for inverse-time delayed protection of loads with normal and heavy starting against excessive temperature rises 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 rated motor 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 a contactor. The break time depends on the ratio between the tripping current and current setting Ie and is stored in the form of a long-term stable tripping characteristic.