Digital overcurrent relay with 3×3 digital LED display TRM-300

Three-phase current relay for controlling/limiting load current in the range of 190-300 A, manufacturer TENSE (Turkey)

The TRM-300 digital overcurrent relays are designed to protect loads from damage caused by high currents while allowing operation monitoring.

- 190-300 A (adjustable overcurrent value)
- 50% fixed current asymmetry
- Adjustable error delay time
- Adjustable operating mode (automatic, semi-automatic, manual)
- When you buy a current relay from the TENSE brand, you receive a ready-to-use device - current transformers are included.

Device use and operating principle

1. Connect the device according to the wiring diagram.
2. When wiring is complete, apply power. After turning on the device, the set values are displayed on the screen for 5 seconds.
3. Use the "A>" controller to set the overcurrent value. The set value is displayed on the left display.
4. Use the "t" controller to set the delay time. The set value is also displayed on the left display.

When the device is turned on:
- The relay turns on, 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.
- When the time expires, the relay turns off, the contact switches to terminal 1, and the OUT indicator goes off.

The electronic current relay from the TRM-300 series is designed for automatic disconnection of devices when the maximum allowable current is exceeded.
It has a programmable activation range, the ability to set activation time and return time.
There are 3 programs for returning to "operational" mode - MANUAL, SEMI-AUTOMATIC, AUTOMATIC.

Return-to-operation 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 manual reset at the next fault. In this mode, the corresponding LED indicator lights up.
- Automatic mode: The system resets automatically after each overcurrent error. In this mode, the LED indicator is lit.

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

Asymmetry 50% (fixed)

If the difference between the highest and lowest phase current exceeds 50%, the device will enter asymmetry error mode within 2 seconds.
(This prevents system damage in case of failure of one phase during motor operation).

During asymmetry error:
- The display group of the two phases that caused the error will flash and the ERR indicator will light up.
- To exit asymmetric error mode, the device must be reset manually.

Technical parameters:

- Operating voltage: 150-260 VAC.
- Operating frequency: 50/60 Hz
- Power consumption: < 6 VA
- Operating temperature: from -20 °C to +55 °C
- Display: 3×3 digits, 5 LEDs
- Overcurrent setting (A>): 190-300 A
- Delay time: 1-200 s
- Connection type: clamp connection
- Contacts: 5 A / 250 V AC (active load)
- Wire diameter: 2.5 mm²
- Weight: max. 250 g
- Mounting: on DIN rail
- Operating altitude: < 2000 m

Note: The TRM-50, TRM-100, TRM-200, and TRM-300 models can only be used with the current transformers supplied with the device.

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