Siemens Industrial Controls 3UB81234EW2 Relay
The Siemens 3UB81234EW2 is a high-performance ESP200 solid state overload relay designed for precise motor protection in industrial HVACR and pumping applications. Engineered to replace legacy ESP100 units without enclosure modifications, this 3-phase overload relay handles a wide current range of 10 to 40 Amps. Unlike standard bimetallic options, the solid state design is ambient insensitive, virtually eliminating nuisance tripping caused by varying mechanical room temperatures. It features a 4:1 FLA adjustment dial and integrated DIP switches for field-selectable trip classes 5, 10, 20, or 30, allowing you to tailor protection for both light-start and heavy-inertia loads. The unit provides advanced protection, including phase loss protection that triggers in under 3 seconds, phase unbalance monitoring, and integrated ground fault protection calibrated at 60% of motor current to prevent insulation-related burnouts. With manual and automatic reset options and a 3-minute cool-down lockout for auto-reset, this A1 frame size relay ensures maximum uptime for critical 3-phase motor circuits.
Key Benefits
- Precision Motor Protection: Offers a repetitive accuracy of greater than 99%, significantly extending motor service life compared to thermal heaters.
- Versatile Trip Classes: Selectable DIP switches allow for Classes 5, 10, 20, or 30, making it suitable for standard induction motors and specialized hermetic compressors.
- Self-Powered Design: Operates directly from the circuit without an external power source, reducing wiring complexity and potential failure points.
- Integrated Diagnostic LED: Features a visible trip indicator to expedite troubleshooting and reduce system downtime during fault events.
- Drop-In Retrofit: Designed as a direct replacement for ESP100 series relays, fitting seamlessly into existing starters and MCC compartments.
Common Questions
Does this relay require separate heater elements?
No. As a solid-state unit, the FLA is adjusted via a dial. This eliminates the need for stocked heater packs and reduces thermal heat dissipation within the control cabinet.
Can I use this for single-phase motor applications?
While optimized for 3-phase systems, this relay can be used for single-phase motors if the current is looped through all three poles to maintain phase balance and prevent tripping.
How does the phase loss protection function?
The circuit monitors for current asymmetry and will interrupt the contactor coil circuit within 3 seconds of a lost phase, protecting the windings from rapid overheating and catastrophic failure.
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.
Siemens Industrial Controls 3UB81234EW2 Relay
The Siemens 3UB81234EW2 is a high-performance ESP200 solid state overload relay designed for precise motor protection in industrial HVACR and pumping applications. Engineered to replace legacy ESP100 units without enclosure modifications, this 3-phase overload relay handles a wide current range of 10 to 40 Amps. Unlike standard bimetallic options, the solid state design is ambient insensitive, virtually eliminating nuisance tripping caused by varying mechanical room temperatures. It features a 4:1 FLA adjustment dial and integrated DIP switches for field-selectable trip classes 5, 10, 20, or 30, allowing you to tailor protection for both light-start and heavy-inertia loads. The unit provides advanced protection, including phase loss protection that triggers in under 3 seconds, phase unbalance monitoring, and integrated ground fault protection calibrated at 60% of motor current to prevent insulation-related burnouts. With manual and automatic reset options and a 3-minute cool-down lockout for auto-reset, this A1 frame size relay ensures maximum uptime for critical 3-phase motor circuits.
Key Benefits
- Precision Motor Protection: Offers a repetitive accuracy of greater than 99%, significantly extending motor service life compared to thermal heaters.
- Versatile Trip Classes: Selectable DIP switches allow for Classes 5, 10, 20, or 30, making it suitable for standard induction motors and specialized hermetic compressors.
- Self-Powered Design: Operates directly from the circuit without an external power source, reducing wiring complexity and potential failure points.
- Integrated Diagnostic LED: Features a visible trip indicator to expedite troubleshooting and reduce system downtime during fault events.
- Drop-In Retrofit: Designed as a direct replacement for ESP100 series relays, fitting seamlessly into existing starters and MCC compartments.
Common Questions
Does this relay require separate heater elements?
No. As a solid-state unit, the FLA is adjusted via a dial. This eliminates the need for stocked heater packs and reduces thermal heat dissipation within the control cabinet.
Can I use this for single-phase motor applications?
While optimized for 3-phase systems, this relay can be used for single-phase motors if the current is looped through all three poles to maintain phase balance and prevent tripping.
How does the phase loss protection function?
The circuit monitors for current asymmetry and will interrupt the contactor coil circuit within 3 seconds of a lost phase, protecting the windings from rapid overheating and catastrophic failure.
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
Shipping & Returns
Shipping & Returns
Description
The Siemens 3UB81234EW2 is a high-performance ESP200 solid state overload relay designed for precise motor protection in industrial HVACR and pumping applications. Engineered to replace legacy ESP100 units without enclosure modifications, this 3-phase overload relay handles a wide current range of 10 to 40 Amps. Unlike standard bimetallic options, the solid state design is ambient insensitive, virtually eliminating nuisance tripping caused by varying mechanical room temperatures. It features a 4:1 FLA adjustment dial and integrated DIP switches for field-selectable trip classes 5, 10, 20, or 30, allowing you to tailor protection for both light-start and heavy-inertia loads. The unit provides advanced protection, including phase loss protection that triggers in under 3 seconds, phase unbalance monitoring, and integrated ground fault protection calibrated at 60% of motor current to prevent insulation-related burnouts. With manual and automatic reset options and a 3-minute cool-down lockout for auto-reset, this A1 frame size relay ensures maximum uptime for critical 3-phase motor circuits.
Key Benefits
- Precision Motor Protection: Offers a repetitive accuracy of greater than 99%, significantly extending motor service life compared to thermal heaters.
- Versatile Trip Classes: Selectable DIP switches allow for Classes 5, 10, 20, or 30, making it suitable for standard induction motors and specialized hermetic compressors.
- Self-Powered Design: Operates directly from the circuit without an external power source, reducing wiring complexity and potential failure points.
- Integrated Diagnostic LED: Features a visible trip indicator to expedite troubleshooting and reduce system downtime during fault events.
- Drop-In Retrofit: Designed as a direct replacement for ESP100 series relays, fitting seamlessly into existing starters and MCC compartments.
Common Questions
Does this relay require separate heater elements?
No. As a solid-state unit, the FLA is adjusted via a dial. This eliminates the need for stocked heater packs and reduces thermal heat dissipation within the control cabinet.
Can I use this for single-phase motor applications?
While optimized for 3-phase systems, this relay can be used for single-phase motors if the current is looped through all three poles to maintain phase balance and prevent tripping.
How does the phase loss protection function?
The circuit monitors for current asymmetry and will interrupt the contactor coil circuit within 3 seconds of a lost phase, protecting the windings from rapid overheating and catastrophic failure.
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.
