Digital overcurrent relay with LED display 3×3 digits TRM-50

Load monitoring/limiting relay, 3-phase, range 15-50 A, manufacturer TENSE (Turkey)

The TRM-50 digital overload relay is designed to protect loads from damage caused by high currents, while allowing control of operation.

• 15-50 A (adjustable overload value)
• 50% fixed current asymmetry
• Adjustable fault delay time
• Adjustable operating mode (automatic, semi-automatic, manual)
• When you buy a TENSE current relay you get a ready-to-operate device - current transformers are included.

Use of the device and operating principle

1. Connect the device according to the enclosed wiring diagram.
2. Once the wiring is complete, connect the power supply. After switching on, the display will show the set values for 5 seconds.
3. Use the "A>" controller to set the overload value. The set value is shown on the left display.
4. Use the "t" controller to set the delay time. The set value is also shown on the left display.

When the device is switched on:

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

The TRM-50 series electronic current relay is designed to automatically disconnect consumers when the maximum allowable currents are exceeded. It has a programmable tripping range, trip time and reverse trip settings. There are 3 modes of return to "operating" state - MANUAL, SEMI-AUTO, AUTO.

Reset Modes

• Manual Mode: To reset the device after overload, press the Reset button. The corresponding LED will light up.
• Semi-automatic Mode: Allows the device to automatically reset the system three times when an overload occurs and then waits for a manual reset on the next error. The corresponding LED will illuminate.
• Automatic mode: The device allows the system to automatically reset each time an overload error occurs. The corresponding LED will illuminate.

Note: To change the mode, hold the SELECT button for 10 seconds. When the mode is changed, the corresponding LED will light up.

Current asymmetry 50% (fixed)

If the difference between the highest and lowest current in the phases exceeds 50%, the device will enter the asymmetry error mode within 2 seconds (prevents damage to the system when one phase is lost).

When an asymmetry error occurs:

• The group of displays of the two phases that caused the fault will flash and the ERR indicator will light.
• A manual reset is required to exit the asymmetry error mode.

Technical parameters

• Operating voltage: 150-260 VAC
• Operating frequency: 50/60 Hz
• Power consumption: <6 VA
• Operating temperature: -20 °C ... +55 °C
• Display: 3 × 3 digits, 5 LEDs
• Overload value (A>): 15-50 A
• Delay time: 0.1-20 s
• Connection type: clamp connection
• Contacts: 5 A / 250 V AC (active load)
• Cable diameter: 2.5 mm²
• Weight: max. 250 g
• Mounting: on DIN rail
• Maximum altitude: <2000 m

Note: The TRM-50, TRM-100, TRM-200 and TRM-300 can only be used with the current transformers included in the delivery.
The TRM-400 can be used with the 400/5 current transformer supplied with the TRM-400.

Basic