Littelfuse 202 Monitor
The Littelfuse 202 3-Phase Voltage Monitor is a microcontroller-based protection relay designed for high-performance motor safeguarding in industrial and HVACR environments. Operating within a 190–480 VAC range at 50/60 Hz, this unit provides continuous analysis of incoming line conditions to mitigate damage from phase loss, phase reversal, voltage unbalance, and over/under voltage fluctuations. For technicians managing 3-phase motor protection, the Series 202 integrates a robust SPDT output relay with a 10A general-purpose rating, ensuring seamless integration into control circuits. The device features an adjustable restart delay from 2 to 300 seconds, specifically engineered to prevent rapid cycling and nuisance tripping during transient power events. With its compact DIN-mount compatible footprint and 0.25-inch male quick-connect terminals, the 202 Monitor is a reliable solution for heavy-duty compressors, pumps, and refrigeration systems where maintaining phase integrity is critical for equipment longevity.
Key Benefits- Universal Voltage Compatibility: Supports a wide 190–480 VAC range, reducing inventory requirements for different line voltages.
- Advanced Microcontroller Logic: Provides 1% trip point accuracy and 0.5% repeat accuracy for precise equipment protection.
- Field-Adjustable Restart Delay: Prevents motor burnout by allowing system stabilization before re-energizing.
- Rugged Temperature Rating: Operates efficiently from -40°F to 158°F, ideal for rooftop units and mechanical rooms.
- Rapid Fault Detection: Features a 2-second trip delay for unbalance and phase faults to minimize winding stress.
What conditions will cause the Littelfuse 202 to trip?
The relay deactivates if it detects voltage unbalance exceeding 6%, phase loss, phase reversal, or if line voltage exceeds 110% (overvoltage) or drops below 90% (undervoltage) of the nominal setting.
Does this unit support 50 Hz power systems?
Yes, the 202 is compatible with both 50 Hz and 60 Hz. Note that running on 50 Hz will increase the pre-set delay timers by approximately 20% due to frequency scaling.
How is the unit mounted and wired?
It utilizes 0.25-inch male quick-connect terminals for rapid termination and is typically secured using a 1/4-inch socket head cap screw through the center of the housing.
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.
Littelfuse 202 Monitor
The Littelfuse 202 3-Phase Voltage Monitor is a microcontroller-based protection relay designed for high-performance motor safeguarding in industrial and HVACR environments. Operating within a 190–480 VAC range at 50/60 Hz, this unit provides continuous analysis of incoming line conditions to mitigate damage from phase loss, phase reversal, voltage unbalance, and over/under voltage fluctuations. For technicians managing 3-phase motor protection, the Series 202 integrates a robust SPDT output relay with a 10A general-purpose rating, ensuring seamless integration into control circuits. The device features an adjustable restart delay from 2 to 300 seconds, specifically engineered to prevent rapid cycling and nuisance tripping during transient power events. With its compact DIN-mount compatible footprint and 0.25-inch male quick-connect terminals, the 202 Monitor is a reliable solution for heavy-duty compressors, pumps, and refrigeration systems where maintaining phase integrity is critical for equipment longevity.
Key Benefits- Universal Voltage Compatibility: Supports a wide 190–480 VAC range, reducing inventory requirements for different line voltages.
- Advanced Microcontroller Logic: Provides 1% trip point accuracy and 0.5% repeat accuracy for precise equipment protection.
- Field-Adjustable Restart Delay: Prevents motor burnout by allowing system stabilization before re-energizing.
- Rugged Temperature Rating: Operates efficiently from -40°F to 158°F, ideal for rooftop units and mechanical rooms.
- Rapid Fault Detection: Features a 2-second trip delay for unbalance and phase faults to minimize winding stress.
What conditions will cause the Littelfuse 202 to trip?
The relay deactivates if it detects voltage unbalance exceeding 6%, phase loss, phase reversal, or if line voltage exceeds 110% (overvoltage) or drops below 90% (undervoltage) of the nominal setting.
Does this unit support 50 Hz power systems?
Yes, the 202 is compatible with both 50 Hz and 60 Hz. Note that running on 50 Hz will increase the pre-set delay timers by approximately 20% due to frequency scaling.
How is the unit mounted and wired?
It utilizes 0.25-inch male quick-connect terminals for rapid termination and is typically secured using a 1/4-inch socket head cap screw through the center of the housing.
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 Littelfuse 202 3-Phase Voltage Monitor is a microcontroller-based protection relay designed for high-performance motor safeguarding in industrial and HVACR environments. Operating within a 190–480 VAC range at 50/60 Hz, this unit provides continuous analysis of incoming line conditions to mitigate damage from phase loss, phase reversal, voltage unbalance, and over/under voltage fluctuations. For technicians managing 3-phase motor protection, the Series 202 integrates a robust SPDT output relay with a 10A general-purpose rating, ensuring seamless integration into control circuits. The device features an adjustable restart delay from 2 to 300 seconds, specifically engineered to prevent rapid cycling and nuisance tripping during transient power events. With its compact DIN-mount compatible footprint and 0.25-inch male quick-connect terminals, the 202 Monitor is a reliable solution for heavy-duty compressors, pumps, and refrigeration systems where maintaining phase integrity is critical for equipment longevity.
Key Benefits- Universal Voltage Compatibility: Supports a wide 190–480 VAC range, reducing inventory requirements for different line voltages.
- Advanced Microcontroller Logic: Provides 1% trip point accuracy and 0.5% repeat accuracy for precise equipment protection.
- Field-Adjustable Restart Delay: Prevents motor burnout by allowing system stabilization before re-energizing.
- Rugged Temperature Rating: Operates efficiently from -40°F to 158°F, ideal for rooftop units and mechanical rooms.
- Rapid Fault Detection: Features a 2-second trip delay for unbalance and phase faults to minimize winding stress.
What conditions will cause the Littelfuse 202 to trip?
The relay deactivates if it detects voltage unbalance exceeding 6%, phase loss, phase reversal, or if line voltage exceeds 110% (overvoltage) or drops below 90% (undervoltage) of the nominal setting.
Does this unit support 50 Hz power systems?
Yes, the 202 is compatible with both 50 Hz and 60 Hz. Note that running on 50 Hz will increase the pre-set delay timers by approximately 20% due to frequency scaling.
How is the unit mounted and wired?
It utilizes 0.25-inch male quick-connect terminals for rapid termination and is typically secured using a 1/4-inch socket head cap screw through the center of the housing.
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.
