Littelfuse 460 3-Phase Voltage Monitor 190-480V AC 10A SPDT DIN Rail

The Littelfuse 460 is a three-phase voltage monitoring relay designed to protect motors and equipment operating on 190-480VAC, 50/60Hz systems regardless of size. This microcontroller-based protection relay features user-selectable nominal voltage setpoints with automatic line voltage sensing capability.

This advanced voltage and phase-sensing device continuously monitors three-phase voltages to detect harmful power line conditions including low voltage, high voltage, unbalanced voltage, loss of any phase, and phase reversal. When a fault condition is detected, the output relay deactivates after a specified trip delay, then reactivates automatically once power line conditions return to acceptable levels for the specified restart delay period, preventing nuisance tripping from rapidly fluctuating power conditions.

Key Features:

• Adjustable trip delay: 1-30 seconds
• Adjustable restart delay: 1-500 seconds
• Adjustable voltage unbalance trip point: 2-8%
• Form C (SPDT) contact configuration
• 10 amp contact rating
• Accepts 12-20 AWG wire range
• 35mm DIN rail or surface mounting capability
• Screw terminal torque: 6 in-lbs
• Diagnostic LED indicators for trip status
• UL508 certified (File #E68520), CE compliant

Ideal for industrial motor protection applications, HVAC systems, pumps, compressors, and building automation systems requiring reliable three-phase power monitoring. The MotorSaver technology helps prevent costly equipment damage and downtime caused by adverse power conditions.