Digital overcurrent relay with 3×3-digit LED display TRM-100

Three-phase current relay for load current control/limitation in the range 40-100 A, manufacturer TENSE (Turkey)

Digital overcurrent relays TRM-100 are designed to protect loads from damage caused by high currents while allowing operation control.

- 40-100 A (adjustable overcurrent value)
- 50% fixed current asymmetry
- Adjustable fault delay time
- Adjustable operating mode (automatic, semi-automatic, manual)
- When purchasing a TENSE current relay, you get a complete device ready for use - current transformers included.

Device Use and Operating Principle

1. Connect the device according to the electrical diagram.
2. When the wiring is complete, connect the power. After switching on, the set values will be displayed on the screen for 5 seconds.
3. Use the "A>" regulator to set the overcurrent value. The set value will be displayed on the left screen.
4. Use the "t" regulator to set the delay time. The set value will also be displayed on the left screen.

When turning on the device:
- The relay activates, the output contact switches to terminal 3 and the OUT indicator lights up.
- If the current exceeds the set overcurrent value (A>), the device starts counting the delay time and the ERR indicator lights up.
- After the time has elapsed, the relay switches off, the contact switches to terminal 1 and the OUT indicator goes out.

Description

The TRM-100 series electronic current relay is designed for automatic shutdown of equipment when the maximum permissible current is exceeded.
It allows setting the switching current, delay time, and return time.
Three programs are available for returning to "operating mode" - MANUAL, SEMI-AUTOMATIC, and AUTOMATIC.

Return Modes:

- Manual mode: After an overcurrent fault, the device must be reset by pressing the Reset button. In this mode, the corresponding LED lights up.
- Semi-automatic mode: The system automatically resets three times after an overcurrent fault, then waits for a manual reset for the next fault. In this mode, the corresponding LED lights up.
- Automatic mode: The system automatically resets after each overcurrent fault. In this mode, the corresponding LED lights up.

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

Asymmetry 50% (fixed)

If the difference between the largest and smallest phase current exceeds 50%, the device will enter asymmetry error mode within 2 seconds.
(This prevents damage to the system if one phase is lost while the motor is running.)

If an asymmetry fault occurs:
- The group of readings for the two phases that caused the fault will flash and the ERR indicator will light up.
- To exit fault mode, the device must be manually reset.

Technical Parameters:

- Operating voltage: 150-260 V AC
- Operating frequency: 50/60 Hz
- Power: < 6 VA
- Operating temperature: -20 °C to +55 °C
- Display: 3x3 digits, 5 LED
- Overcurrent setting (A>): 40-100 A
- Delay time: 0.1 s - 20 s
- Connection type: terminal
- Contacts: 5 A / 250 V AC (active load)
- Wire diameter: 2.5 mm²
- Weight: max. 250 g
- Installation: DIN rail
- Operating altitude: < 2000 m

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

Basic