Motor Load Monitor, True kW, 0/4-20 mA Output, Dual Relays

Motor Load Monitor, True kW, 0/4-20 mA Output, Dual Relays is a digital load monitor designed for protecting pumps, conveyors and other motor-driven machines by measuring true motor power. Its wide single- and three-phase voltage coverage, internal current ranges up to 40 A and isolated analogue output make it suitable for both protection and load feedback duties.

Technical Highlights

• Measures true motor power on 1 x 100-400 V AC and 3 x 100-575 V AC systems
• Internal current ranges from 0.5 A to 40 A with external CT option up to 600 A
• Isolated analogue output configurable as 0-20 mA or 4-20 mA
• Dual relay outputs for high and low load limits
• DIN rail or wall mounting in a compact housing

Benefits

• Helps detect overload, underload and dry-run conditions using real power measurement
• Provides analogue load feedback for monitoring and control
• Reduces the need for separate transducers and protection devices
• Covers a wide range of voltages and currents with one unit

Applications

• Pump dry-run and overload protection
• Conveyor jam and loss-of-load monitoring
• Mixer, crusher and hoist supervision
• Motor-driven machinery requiring load feedback and alarms

Designed for dependable kW-based machine protection where accurate load monitoring and clear alarm output are required.

FAQs

Why use true kW measurement instead of current alone?

True power monitoring gives a more reliable picture of motor load, which is useful for detecting both overload and low-load conditions such as dry run or broken belts.

Can this unit provide both alarms and analogue feedback?

Yes. It includes dual relays for load limits and an isolated 0-20 mA or 4-20 mA output for proportional load indication.

What is the difference between the Unipower HPL500 and HPL500MB?

The main difference between the Unipower HPL500 and HPL500MB is communication capability. While both units provide the same advanced motor and machine protection by monitoring true motor power, the HPL500MB includes an integrated RS-485 Modbus RTU interface for digital communication with PLCs, SCADA systems and Industry 4.0 networks.