Digital overcurrent relay with LED display 3×3 digits TRM-400

Current relay for load monitoring/restriction, 3-phase, range 290–400 A, manufacturer TENSE (Turkey)

The TRM-400 digital overload relay is designed to protect the load from damage caused by high currents and simultaneously allows for operation control.

• 290–400 A (adjustable overload value)
• Adjustable error delay time
• Adjustable operating mode (automatic, semi-automatic, manual)
• When purchasing a current relay TENSE will provide you with a device ready for operation – the delivery includes current transformers.

Use of the device and the principle of operation

1. Connect the device according to the attached the wiring diagram.
2. After completing the wiring, connect the power. After when turned on, the display will show the set values for 5 seconds.
3. To set the value for overload use the regulator "A>". The set value is displayed on left display.
4. To set the delay time use the regulator "t". The set value is also displayed on the left the display.

When the device is powered on:

• The relay activates, the output contact switches to terminal 3 and the OUT indicator lights up.
• If the current exceeds the set value overload (A>), the device counts down the delay time, during which the ERR indicator lights up.
• After the set time has elapsed, the relay turns off the contact switches to terminal 1 and the OUT indicator goes out.

The TRM-400 series electronic current relay is designed to automatically disconnect consumers when exceeding the maximum permissible currents. It has a programmable start range, the option to set the start time and the time of reactivation. There are 3 return modes to "operational" state – MANUAL, SEMI-AUTOMATIC, AUTOMATIC.

Reset Modes

• Manual mode: To reset the device after overload, it is necessary to press the Reset button. In this mode, the the corresponding LED.
• Semi-automatic mode: The device allows automatic system reset three times upon overload occurrence and then waits for manual reset on the next error. The corresponding LED will light up.
• Automatic mode: The device allows automatic system reset on each overload error. It will light up the corresponding LED.

Note: To change the mode, hold the SELECT button for 10 seconds. After changing the mode, the corresponding LED will light up.

Technical parameters

• Operating voltage: 150–260 V AC
• Operating frequency: 50/60 Hz
• Power consumption: <6 VA
• Operating temperature: -20 °C … +55 °C
• Display: 3 × 3 digits, 5 LEDs
• Overload value (A>): 290–400 A
• Delay time: 1–200 s
• Connection type: terminal connection
• Contacts: 5 A / 250 V AC (active load)
• Cable diameter: 2.5 mm²
• Weight: max. 250 g
• Installation: on DIN rail
• Maximum altitude: <2000 m 

 Note: Models TRM-50, TRM-100, TRM-200, and TRM-300 can use only with current transformers that are part of the supply.

Model TRM-400 can be used with a current transformer 400/5

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