SIEMENS 3RB1056-1FG0 Product Description

SIEMENS 3RB1056-1FG0 is a SIRIUS electronic overload relay designed for three-phase asynchronous motor protection. This electronic overload relay monitors motor operating current to prevent damage caused by overload and phase loss. The compact electronic overload relay can be mounted directly on matched contactors or DIN rail separately. This electronic overload relay supports manual and automatic reset modes for flexible on-site operation.

3RB1056-1FG0 delivers reliable phase failure protection to detect unbalanced current or missing phase in three-phase circuits. Sensitive phase failure protection trips rapidly once phase loss occurs during motor running. Stable phase failure protection avoids motor burnout from uneven heating of windings. Dependable phase failure protection improves safety for heavy-duty motor drive systems.

This unit features adjustable current setting covering 50A to 200A for different motor specifications. Accurate current setting allows technicians to match the rated motor current easily. Flexible current setting adapts to multiple motor power ranges in one device. Consistent current setting maintains precise trip threshold under long cyclic operation.

SIEMENS 3RB1056-1FG0 is widely used in pumps, fans, conveyors and machine tool motor control panels. It is Class 10 trip characteristic and equipped with auxiliary signal contacts for fault feedback. LED indicators help quickly diagnose overload or phase failure faults. It serves as discontinued original spare part for maintenance of legacy SIRIUS motor control systems.