Littelfuse 201A Monitor
The Littelfuse 201A Monitor is a professional-grade 3-phase plug-in voltage monitor engineered to protect induction motors from catastrophic power line conditions. This unit features a microcontroller-based voltage sensing system that provides auto-ranging capabilities across 190–480V AC at 50/60Hz. By automatically detecting the system voltage and selecting between the 200V and 400V scales, this phase monitoring relay eliminates manual configuration errors during startup. It is built to detect phase loss, low voltage, voltage unbalance, and phase reversal, deactivating the output relay upon fault detection to prevent winding damage. The integrated advanced LED diagnostics utilize specific color patterns to allow technicians to distinguish between normal operation and trip conditions like reverse-phase or single-phasing at a glance. Housed in a compact enclosure, it utilizes a standard 8-pin octal socket (such as the OT08PC) for rapid DIN-rail or surface mounting in HVACR control panels.
Key Benefits for Technicians:
- Universal Compatibility: The 190-480V AC motor protection range ensures one part number covers most commercial 3-phase applications, reducing truck stock requirements.
- Microprocessor Accuracy: Features proprietary circuitry that provides precise voltage unbalance protection to mitigate excessive heat buildup in motor windings.
- Rapid Installation: The 3-phase plug-in voltage monitor design allows for quick replacement without rewiring entire control circuits.
- Visual Troubleshooting: Single LED indicator identifies the specific fault (unbalance, phase loss, or high/low voltage), significantly reducing downtime during service calls.
- Rugged Reliability: Built for industrial environments with an operating temperature range of -20°C to 70°C.
Common Questions & Technical Insights:
What is the primary function of the auto-sensing range?
The auto-sensing feature simplifies setup by automatically adjusting the internal trip points based on the detected nominal line voltage between 190V and 480V, ensuring the Littelfuse 201A Monitor is sensitive to the actual line conditions without manual calibration.
How does this unit handle nuisance tripping from fluctuating power?
It utilizes a built-in trip delay of several seconds for undervoltage and unbalance to avoid unnecessary shutdowns caused by transient voltage dips, while maintaining a sub-one-second response for critical phase loss events.
Does this require a specific socket for full rating?
Yes, for maximum technical compliance and 600V safety ratings, use the UL-listed OT08PC octal socket. Standard 8-pin relay sockets may not meet the transient voltage requirements of high-leg delta or 480V wye systems.
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 201A Monitor
The Littelfuse 201A Monitor is a professional-grade 3-phase plug-in voltage monitor engineered to protect induction motors from catastrophic power line conditions. This unit features a microcontroller-based voltage sensing system that provides auto-ranging capabilities across 190–480V AC at 50/60Hz. By automatically detecting the system voltage and selecting between the 200V and 400V scales, this phase monitoring relay eliminates manual configuration errors during startup. It is built to detect phase loss, low voltage, voltage unbalance, and phase reversal, deactivating the output relay upon fault detection to prevent winding damage. The integrated advanced LED diagnostics utilize specific color patterns to allow technicians to distinguish between normal operation and trip conditions like reverse-phase or single-phasing at a glance. Housed in a compact enclosure, it utilizes a standard 8-pin octal socket (such as the OT08PC) for rapid DIN-rail or surface mounting in HVACR control panels.
Key Benefits for Technicians:
- Universal Compatibility: The 190-480V AC motor protection range ensures one part number covers most commercial 3-phase applications, reducing truck stock requirements.
- Microprocessor Accuracy: Features proprietary circuitry that provides precise voltage unbalance protection to mitigate excessive heat buildup in motor windings.
- Rapid Installation: The 3-phase plug-in voltage monitor design allows for quick replacement without rewiring entire control circuits.
- Visual Troubleshooting: Single LED indicator identifies the specific fault (unbalance, phase loss, or high/low voltage), significantly reducing downtime during service calls.
- Rugged Reliability: Built for industrial environments with an operating temperature range of -20°C to 70°C.
Common Questions & Technical Insights:
What is the primary function of the auto-sensing range?
The auto-sensing feature simplifies setup by automatically adjusting the internal trip points based on the detected nominal line voltage between 190V and 480V, ensuring the Littelfuse 201A Monitor is sensitive to the actual line conditions without manual calibration.
How does this unit handle nuisance tripping from fluctuating power?
It utilizes a built-in trip delay of several seconds for undervoltage and unbalance to avoid unnecessary shutdowns caused by transient voltage dips, while maintaining a sub-one-second response for critical phase loss events.
Does this require a specific socket for full rating?
Yes, for maximum technical compliance and 600V safety ratings, use the UL-listed OT08PC octal socket. Standard 8-pin relay sockets may not meet the transient voltage requirements of high-leg delta or 480V wye systems.
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 201A Monitor is a professional-grade 3-phase plug-in voltage monitor engineered to protect induction motors from catastrophic power line conditions. This unit features a microcontroller-based voltage sensing system that provides auto-ranging capabilities across 190–480V AC at 50/60Hz. By automatically detecting the system voltage and selecting between the 200V and 400V scales, this phase monitoring relay eliminates manual configuration errors during startup. It is built to detect phase loss, low voltage, voltage unbalance, and phase reversal, deactivating the output relay upon fault detection to prevent winding damage. The integrated advanced LED diagnostics utilize specific color patterns to allow technicians to distinguish between normal operation and trip conditions like reverse-phase or single-phasing at a glance. Housed in a compact enclosure, it utilizes a standard 8-pin octal socket (such as the OT08PC) for rapid DIN-rail or surface mounting in HVACR control panels.
Key Benefits for Technicians:
- Universal Compatibility: The 190-480V AC motor protection range ensures one part number covers most commercial 3-phase applications, reducing truck stock requirements.
- Microprocessor Accuracy: Features proprietary circuitry that provides precise voltage unbalance protection to mitigate excessive heat buildup in motor windings.
- Rapid Installation: The 3-phase plug-in voltage monitor design allows for quick replacement without rewiring entire control circuits.
- Visual Troubleshooting: Single LED indicator identifies the specific fault (unbalance, phase loss, or high/low voltage), significantly reducing downtime during service calls.
- Rugged Reliability: Built for industrial environments with an operating temperature range of -20°C to 70°C.
Common Questions & Technical Insights:
What is the primary function of the auto-sensing range?
The auto-sensing feature simplifies setup by automatically adjusting the internal trip points based on the detected nominal line voltage between 190V and 480V, ensuring the Littelfuse 201A Monitor is sensitive to the actual line conditions without manual calibration.
How does this unit handle nuisance tripping from fluctuating power?
It utilizes a built-in trip delay of several seconds for undervoltage and unbalance to avoid unnecessary shutdowns caused by transient voltage dips, while maintaining a sub-one-second response for critical phase loss events.
Does this require a specific socket for full rating?
Yes, for maximum technical compliance and 600V safety ratings, use the UL-listed OT08PC octal socket. Standard 8-pin relay sockets may not meet the transient voltage requirements of high-leg delta or 480V wye systems.
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.
