Siemens Industrial Controls 3UB85336GW2 Relay

The Siemens 3UB85336GW2 is a high-performance ESP200 solid-state overload relay engineered for precise motor protection in demanding industrial and HVACR environments. Designed for three-phase systems, this B-size frame unit provides a wide 25-100A current range, making it a versatile solution for protecting various motor sizes and types, including hermetically sealed compressor motors. Utilizing electronic sensing, the 3UB85336GW2 offers phase loss protection with a rapid trip response of less than three seconds and remains ambient insensitive, ensuring consistent performance regardless of external temperature fluctuations. This Class 958/958L relay features a conformally coated circuit board for enhanced durability against moisture and contaminants, and supports both manual and automatic reset modes to accommodate specific operational workflows. Whether used for direct mounting or stand-alone applications, this Siemens industrial control component ensures reliable phase unbalance protection and minimizes the risk of motor burnout during stall conditions.

• Broad Adjustable Range: Provides 25-100A overload protection, allowing for standardizing on fewer parts for multiple motor sizes.
• Enhanced Environmental Resilience: Features ambient insensitive operation and conformally coated boards for reliability in harsh mechanical rooms.
• Superior Phase Protection: Integrated phase loss and phase unbalance monitoring trips in under 3 seconds to prevent catastrophic winding damage.
• Flexible Mounting & Reset: Supports B-size frame direct mounting to contactors or stand-alone installation with manual/auto reset functionality.
• Specialized Motor Support: Specifically designed for hermetic motors and artificially cooled motors requiring quick trip response times.

What trip class does the Siemens 3UB85336GW2 follow?
This model is a Class 958L solid-state relay, specifically optimized for quick trip responses—removing power in approximately 7 seconds at 250% locked rotor current to protect sensitive rotors.

Can this relay replace older thermal or ESP100 units?
Yes, the 3UB85336GW2 is designed with the same footprint and dimensions as ESP100 overload relays, making it a direct retrofit for existing Siemens and Furnas control setups.

Does this unit require an external power supply?
No, the ESP200 solid-state design is self-powered from the main circuit, reducing installation complexity and the need for additional external wiring.

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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.