Current and Voltage Monitoring Relay TRM-30M - Single-phase, 30 A, Digital Display

Product Description

The TRM-30M is a single-phase digital relay designed to protect sensitive equipment from overcurrent, overvoltage, and undervoltage.
The device allows precise adjustment of the current limit and delay and displays the measured values of voltage and current on a two-line display. A current transformer is included in the package.

Key Features

• Overload protection: adjustable current 0.5 ... 30 A

• Overvoltage protection: activation at voltage > 250 V (fixed)

• Undervoltage protection: activation at voltage < 150 V (fixed)

• Voltage hysteresis: 5 V

• Voltage fault delay: 2 s

• Voltage fault recovery: 2 s

• Clear two-line LED display:

  • Top line - voltage and overcurrent

  • Bottom line - delay time and current

• LED "OUT" status indication

Operating Principle

• When powered on, the display shows the set overcurrent value and delay time.

• The device monitors the voltage between the phase and neutral conductors and the current consumed from the network.

• If the set values are exceeded, the relay enters a fault state:

  • NO contact opens, NC contact closes

  • The "OUT" LED turns off

  • The corresponding display flashes

Protection Functions

• Overload (overcurrent): when the set current and delay values are exceeded

• Overvoltage: when voltage is above 250 V (automatic reset when voltage drops below 245 V)

• Undervoltage: when voltage is below 150 V (automatic reset after rising above 155 V)

Signaling

• Top display flashes: high or low voltage fault

• Bottom display flashes: high current fault

• LED OUT: lights up during normal operation

Relay Status

Applications

• Protection of sensitive single-phase equipment (motors, heaters, lighting)

• Current and voltage control in industrial and household applications

• Precise adjustment of threshold values and delay for reliable operation