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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Manuals, model checks, and system matching for 3UA59 40-1J are available through Apter Power.

        3UA59 40-1J

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        1001 reviews ｜ Need a Specific Revision?
        Siemens 3UA59 40-1J is a 3UA thermal overload relay that monitors a motor branch from 6.3 to 10 A and changes its auxiliary contacts when sustained overcurrent occurs.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
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        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Technical specifications for 3UA59 40-1J

        • Manufacturer:
          Siemens
        • Part Number:
          3UA59 40-1J
        • Product Family:
          Siemens Drives & Motion Control
        • Product Type:
          Thermal Overload Relay
        • Stock:
          1
        • Current Setting Range:
          6.3 to 10 A
        • Trip Class:
          10A
        • Auxiliary Contacts:
          1 NO + 1 NC
        • Phase-Failure Sensitivity:
          Yes
        • Reset Modes:
          Manual and automatic
        • Temperature Compensation:
          Integrated
        • Test Button:
          Integrated
        • Rated Insulation Voltage:
          690 V
        • Rated Operational Voltage:
          690 V
        • AC Frequency:
          Up to 400 Hz
        • Operating Temperature:
          -25 to +55 °C
        • Maximum IEC Fuse:
          25 A
        • Main Conductor Range:
          1.5 to 25 mm² solid/stranded
        • Main Flexible Conductor Range:
          1 to 16 mm² with sleeve
        • Main Terminal Screw:
          M5
        • Auxiliary Terminal Screw:
          M3.5
        • Weight:
          0.6173 lbs (0.28 kg)
        • Estimated shipping dimensions:
          10.5x8.75x4.5cm
        • Tariff Code:
          85364900
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Current Setting Trip and Reset Motor Branch Terminal Assembly

        Features:

        • Adjusts the motor-overload setting across a 6.3 to 10 A range.
        • Changes one NC and one NO auxiliary contact after a thermal trip.
        • Combines phase-failure sensitivity with temperature-compensated release behavior.
        The main current paths heat the release elements while the auxiliary contacts report the resulting trip to the control circuit.

        Its Class 10A behavior distinguishes sustained overload from the temporary current expected during motor acceleration.

        Reset selection determines whether the contactor circuit needs operator acknowledgement after the mechanism cools.

        The Siemens 3UA59 40-1J Thermal Overload Relay may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 3UA59 40-1J Thermal Overload Relay Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        Relating the adjustment dial to the protected motor

        • Nameplate basis: The dial is set from the motor rated current, not the upstream fuse value.
        • Adjustment window: The selected current must remain within the 6.3 to 10 A range.
        • Thermal response: Higher or longer overcurrent increases heating until the release operates.
        • Coordination: The contactor and fuse are selected around the same motor branch but perform different duties.

        Moving from overload detection to control-circuit release

        • NC contact: The normally closed contact opens the contactor-control path after a trip.
        • NO contact: The normally open contact changes state for an alarm or status circuit.
        • Manual reset: Operator action is required before the control circuit can be restored.
        • Automatic reset: The relay can reset after cooling when the selector is placed in automatic mode.

        Separating overload, short-circuit and switching functions

        • Overload duty: The relay responds to sustained motor overcurrent.
        • Short-circuit duty: The coordinated upstream fuse clears high fault current.
        • Switching duty: The contactor makes and breaks normal motor current.
        • Phase loss: Unequal heating from a missing phase accelerates the overload response.

        Maintaining current paths and control contacts separately

        • Main terminals: Motor-branch conductors use the larger M5 terminal system.
        • Auxiliary terminals: Control wiring lands on the separate M3.5 contact terminals.
        • Conductor preparation: Flexible conductors require the documented end-sleeve size and clamping range.
        • Single-unit mounting: The relay body is installed as the documented stand-alone arrangement for the 3UA59 frame.
        Description
        Siemens 3UA59 40-1J is a 3UA thermal overload relay for motor-branch protection. Its adjustable release monitors load current from 6.3 to 10 A and changes the auxiliary control contacts when heating produced by sustained overcurrent reaches the trip condition.

        Motor current passes through the three main paths of 3UA59 40-1J, where the thermal elements respond to both current magnitude and duration. The Class 10A curve lets normal starting current pass while separating a persistent overload from a short acceleration event.

        When 3UA59 40-1J trips, one normally closed contact interrupts the contactor-control circuit and one normally open contact can signal the condition. Manual or automatic reset determines how that control circuit becomes available again after the thermal mechanism releases.

        The current dial on 3UA59 40-1J must match the protected motor nameplate rather than the contactor frame size. Phase-failure response and temperature compensation act on the same release system, so branch coordination includes conductor size, upstream fuse and reset mode.
        Alternative Names
        Siemens 3UA5940-1J 3UA59 40 1J Overload Relay 3UA59401J 3UA59-40-1J Siemens 3UA59 40-1J 6.3-10A 3UA 59 40-1J 3UA5940 1J Thermal Relay 3UA59 40-IJ
        Technical notes
        Set Siemens 3UA59 40-1J to the motor nameplate current and coordinate its upstream fuse with the documented branch design.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why does Siemens 3UA59 40-1J trip during every motor start?
        Compare the motor starting time with the Class 10A curve and confirm that Siemens 3UA59 40-1J is set to the nameplate current.
        What should be checked if 3UA59 40-1J will not reset?
        Allow 3UA59 40-1J to cool, verify the manual/automatic selector position and remove the overload condition before resetting.
        How are the two auxiliary contacts of Siemens 3UA59 40-1J used?
        The NC contact of Siemens 3UA59 40-1J normally interrupts the contactor circuit, while the NO contact can operate a trip indication.
        Can the upstream fuse setting replace the current adjustment on 3UA59 40-1J?
        No. The fuse protects the fault-current path; 3UA59 40-1J still needs its own 6.3 to 10 A motor-current setting.
        Why can a phase loss operate Siemens 3UA59 40-1J even below the three-phase current setting?
        A missing phase creates unequal thermal loading, and Siemens 3UA59 40-1J uses that imbalance to accelerate its protective response.
        Which terminals must remain separate on 3UA59 40-1J?
        Keep the main motor-current terminals separate from the auxiliary control contacts on 3UA59 40-1J and use their specified conductor ranges.

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