Monitoring current and voltage relay TRM-30M – single-phase, 30 A, digital display

Product description

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

Main functions

• Overload protection: adjustable current 0.5 … 30 A

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

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

• Voltage hysteresis: 5 V

• Voltage fault delay: 2 s

• Voltage fault reset: 2 s

• Clear two-line LED display:

  • Upper row – voltage and overcurrent

  • Lower row – delay time and current

• LED status indication "OUT"

Operating principle

• When powered on, it displays the set overcurrent value and delay time.

• The device monitors voltage between phase and neutral conductor and current drawn from the network.

• In case of exceeding set values, the relay switches to fault state:

  • NO contact open, NC contact closed

  • LED "OUT" turns off

  • Corresponding display flashes

Protective functions

• Overload (excessive current): after exceeding the set current and time delay

• Overvoltage: at voltage above 250 V (automatic reset after dropping below 245 V)

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

Signaling

• Upper display flashes: high or low voltage fault

• Lower display flashes: high current fault

• LED OUT: lights during normal operation

Relay status

Application

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

• Current and voltage monitoring in industrial and household applications

• Precise adjustment of limits and time delay for reliable operation