Siemens Industrial Controls 3UB81234CW2 Relay
The Siemens 3UB81234CW2 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 Size A1 electronic overload offers an adjustable current range of 3-12 Amps, providing a much higher degree of accuracy than traditional thermal units. Featuring selectable trip classes (5, 10, 20, or 30) via integrated DIP switches, it allows contractors to customize protection based on specific motor load profiles and starting conditions. The unit includes phase loss protection with a sub-3-second trip time and is ambient insensitive, effectively eliminating nuisance tripping caused by temperature fluctuations in the mechanical room. With its self-powered design and manual/auto reset functionality, this relay is a direct, drop-in replacement for older ESP100 models, requiring no additional control power or heaters.
Key Benefits- Precise Current Regulation: Dial in Exact Full Load Amps (FLA) between 3A and 12A for superior motor winding protection.
- Reduced Tooling Requirements: No heaters required simplifies inventory and reduces cabinet heat dissipation.
- Enhanced Diagnostics: Visible trip indicator and 1NO/1NC auxiliary contacts provide immediate feedback for troubleshooting.
- Advanced Reliability: Built-in phase unbalance and ground fault detection prevent terminal motor failures.
- Universal Mounting: Supports both direct mounting to Siemens contactors and stand-alone DIN rail installation for flexible panel layouts.
How do I set the trip class on the 3UB81234CW2?
Use the DIP switches located on the front faceplate to select between Class 5, 10, 20, or 30. This allows you to match the relay to the specific inertia and starting characteristics of your motor.
Is this relay compatible with single-phase applications?
While optimized for 3-phase service, the ESP200 series can often be utilized in single-phase circuits by wiring the poles in series to ensure the electronics detect current on all monitored paths.
Does the unit require an external power source for the electronics?
No, the 3UB81234CW2 is self-powered, drawing the necessary energy directly from the main circuit, which simplifies wiring and reduces potential failure points.
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 3UB81234CW2 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 Size A1 electronic overload offers an adjustable current range of 3-12 Amps, providing a much higher degree of accuracy than traditional thermal units. Featuring selectable trip classes (5, 10, 20, or 30) via integrated DIP switches, it allows contractors to customize protection based on specific motor load profiles and starting conditions. The unit includes phase loss protection with a sub-3-second trip time and is ambient insensitive, effectively eliminating nuisance tripping caused by temperature fluctuations in the mechanical room. With its self-powered design and manual/auto reset functionality, this relay is a direct, drop-in replacement for older ESP100 models, requiring no additional control power or heaters.
Key Benefits- Precise Current Regulation: Dial in Exact Full Load Amps (FLA) between 3A and 12A for superior motor winding protection.
- Reduced Tooling Requirements: No heaters required simplifies inventory and reduces cabinet heat dissipation.
- Enhanced Diagnostics: Visible trip indicator and 1NO/1NC auxiliary contacts provide immediate feedback for troubleshooting.
- Advanced Reliability: Built-in phase unbalance and ground fault detection prevent terminal motor failures.
- Universal Mounting: Supports both direct mounting to Siemens contactors and stand-alone DIN rail installation for flexible panel layouts.
How do I set the trip class on the 3UB81234CW2?
Use the DIP switches located on the front faceplate to select between Class 5, 10, 20, or 30. This allows you to match the relay to the specific inertia and starting characteristics of your motor.
Is this relay compatible with single-phase applications?
While optimized for 3-phase service, the ESP200 series can often be utilized in single-phase circuits by wiring the poles in series to ensure the electronics detect current on all monitored paths.
Does the unit require an external power source for the electronics?
No, the 3UB81234CW2 is self-powered, drawing the necessary energy directly from the main circuit, which simplifies wiring and reduces potential failure points.
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.
