Siemens Industrial Controls 3UB85335HW2 Overload Relay
The Siemens 3UB85335HW2 is a robust electronic solid-state overload relay designed for demanding industrial applications requiring precise motor protection between 50A and 200A. Engineered for three-phase motor protection, this unit offers a wide adjustment range, eliminating the need for multiple thermal overload heaters. It features internal current transformer (CT) sensing to monitor phase currents accurately, providing reliable protection against phase loss, phase imbalance, and ground fault conditions. This Class 10/20/30 selectable relay allows technicians to fine-tune tripping characteristics based on motor start-up curves and load profiles, ensuring maximum uptime while preventing winding damage. Compatible with Siemens Sirius 3RT contactors, the 3UB85335HW2 facilitates a compact control panel footprint through direct mounting or standalone installation using terminal brackets.
Key Benefits for Technicians:
- Wide Current Range: The 50-200A adjustment range provides versatile protection for various motor sizes with a single SKU.
- Solid-State Precision: Electronic sensing offers superior accuracy compared to traditional bimetallic relays, reducing nuisance tripping.
- Selectable Trip Classes: Adjustable settings for Class 10, 20, or 30 accommodate standard and heavy-duty starting cycles.
- Integrated Diagnostics: LED status indicators and manual/auto reset modes streamline troubleshooting during maintenance cycles.
Common Technical Questions:
Can I use the Siemens 3UB85335HW2 with VFDs?
Yes, however, ensure the relay is installed on the line side of the drive or that the VFD output frequency is within the relay's rated operating range (typically 50/60 Hz) to avoid sensing errors.
Does this unit require an external power supply?
The 3UB85335HW2 is typically self-powered via the current transformers, though control circuit wiring is required for the auxiliary contacts (NC/NO) to interface with your contactor coil.
How do I handle a ground fault trip?
The relay identifies unbalanced loads and ground faults. If a trip occurs, verify insulation resistance of the motor windings and check for loose terminal connections before resetting the device.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Shipping & Returns
Description
The Siemens 3UB85335HW2 is a robust electronic solid-state overload relay designed for demanding industrial applications requiring precise motor protection between 50A and 200A. Engineered for three-phase motor protection, this unit offers a wide adjustment range, eliminating the need for multiple thermal overload heaters. It features internal current transformer (CT) sensing to monitor phase currents accurately, providing reliable protection against phase loss, phase imbalance, and ground fault conditions. This Class 10/20/30 selectable relay allows technicians to fine-tune tripping characteristics based on motor start-up curves and load profiles, ensuring maximum uptime while preventing winding damage. Compatible with Siemens Sirius 3RT contactors, the 3UB85335HW2 facilitates a compact control panel footprint through direct mounting or standalone installation using terminal brackets.
Key Benefits for Technicians:
- Wide Current Range: The 50-200A adjustment range provides versatile protection for various motor sizes with a single SKU.
- Solid-State Precision: Electronic sensing offers superior accuracy compared to traditional bimetallic relays, reducing nuisance tripping.
- Selectable Trip Classes: Adjustable settings for Class 10, 20, or 30 accommodate standard and heavy-duty starting cycles.
- Integrated Diagnostics: LED status indicators and manual/auto reset modes streamline troubleshooting during maintenance cycles.
Common Technical Questions:
Can I use the Siemens 3UB85335HW2 with VFDs?
Yes, however, ensure the relay is installed on the line side of the drive or that the VFD output frequency is within the relay's rated operating range (typically 50/60 Hz) to avoid sensing errors.
Does this unit require an external power supply?
The 3UB85335HW2 is typically self-powered via the current transformers, though control circuit wiring is required for the auxiliary contacts (NC/NO) to interface with your contactor coil.
How do I handle a ground fault trip?
The relay identifies unbalanced loads and ground faults. If a trip occurs, verify insulation resistance of the motor windings and check for loose terminal connections before resetting the device.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
