Current and voltage monitoring 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 setting of current limits and delay and displays measured values of voltage and current on a two-character display. A current transformer is included.

Main functions

• 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 reset: 2 s

• Clear two-line LED display:

  • Upper line - voltage and overcurrent

  • Lower line - delay time and current

• LED "OUT" status indication

Operating principle

• When power is connected, the set overcurrent value and delay time are displayed.

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

• If set values are exceeded, the relay switches to fault state:

  • NO contact open, NC contact closed

  • LED "OUT" turns off

  • Corresponding indicator flashes

Protective functions

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

• Overvoltage: when voltage is above 250 V (automatic return when voltage falls below 245 V)

• Undervoltage: at voltage below 150 V (automatic return 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

Use

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

• Monitoring current and voltage in industrial and domestic applications

• Precise settings of threshold values and time delay for reliable operation