Description
The Littelfuse 35040028 is a precision-engineered 3-phase voltage monitoring relay built to safeguard motors and industrial equipment operating on 380–480VAC systems. Part of the trusted Littelfuse 350 Series, this relay continuously monitors critical phase conditions — including undervoltage, overvoltage, phase loss, phase imbalance, and phase reversal — delivering reliable, proactive protection against equipment damage and unplanned downtime.
Powered by a microcontroller-based design, the 35040028 offers superior monitoring accuracy and responds rapidly to fault conditions before damage can occur. Built-in LED diagnostic indicators provide instant visual feedback on system status and active faults, simplifying troubleshooting and reducing service time. Its DPDT (Form C) relay output is rated for demanding industrial switching applications, enabling seamless integration into motor control circuits and automation panels.
The 350 Series is a proven solution across a wide range of 3-phase motor applications, including HVAC systems, pumps, compressors, conveyors, and other industrial equipment where dependable 480V protection is non-negotiable.
Key Features
- 3-phase voltage monitoring relay designed for industrial motor protection
- Wide operating voltage range: 380–480VAC
- Detects phase loss, phase reversal, voltage imbalance, and over/undervoltage conditions
- DPDT (Form C) relay output for flexible control circuit integration
- Microcontroller-based design for fast, accurate fault detection
- Built-in LED diagnostic indicators for rapid fault identification and system status monitoring
- Adjustable trip and restart delay functions for application-specific tuning
- Heavy-duty construction engineered for continuous industrial use
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