Littelfuse 250A Monitor

190-480VAC 3PH Syscom Mtr Svr

Littelfuse 250A Three-Phase Monitor – 190–480VAC Motor Protection

Ensure reliable protection for your three-phase motors with the Littelfuse 250A Monitor, designed for systems ranging from 190 to 480 V AC, 50/60 Hz. This auto-ranging, dual-range voltage monitor safeguards motors of all sizes against harmful power line conditions, including low/high voltage, voltage unbalance, single-phase, and phase reversal.

Key Features:

• Proprietary microcontroller-based circuitry for accurate voltage and phase detection

• Auto-sensing wide voltage range (190–480 V AC) eliminates setup complexity

• Advanced LED diagnostics with five distinct light patterns for instant fault identification

• Adjustable or manual restart delay for flexible operation

• DPDT relay output for reliable switching

• Manual reset for thorough equipment inspection before re-energizing

Benefits:

• Continuous monitoring prevents damage from single-phase, low-voltage, voltage unbalance, and phase reversal conditions

• Auto-selecting voltage ranges save setup time and reduce installation errors

• Quick LED fault diagnostics allow for faster troubleshooting

• Adjustable delay prevents nuisance tripping from temporary voltage fluctuations

• Versatile design suitable for a wide range of industrial and commercial motor applications

• Ensures equipment can be safely inspected before re-energization

The Littelfuse 250A Monitor is the ideal solution for industrial motor protection, combining advanced microcontroller technology, user-friendly diagnostics, and robust reliability to keep your operations running safely and efficiently.

Note: Operating at 50 Hz increases all delay timers by 20%.