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

Load monitoring/limiting relay, 3-phase, range 290-400 A, manufacturer TENSE (Turkey)

The TRM-400 digital overload relay is designed to protect loads from damage caused by high currents, while allowing operational control.

• 290-400 A (adjustable overload value)
• Adjustable fault delay time
• Adjustable operating mode (automatic, semi-automatic, manual)
• When purchasing a TENSE current relay, you get a ready-to-use device - current transformers are included.

Device operation and working principle

1. Connect the device according to the attached wiring diagram.
2. Once the wiring is complete, connect the power supply. After power-on, the set values will be displayed on the screen for 5 seconds.
3. Use the "A>" regulator to set the overload 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 the device is switched on:

• The relay switches 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, after which the ERR indicator lights up.
• After the set time has elapsed, the relay switches off the contact, switches to terminal 1 and the OUT indicator goes out.

The TRM-400 series electronic current relay is designed for automatic disconnection of consumers when the maximum permissible current is exceeded. It has a programmable switching range and the ability to set the switching time and reset time. There are 3 modes for returning to "operating" state - MANUAL, SEMI-AUTO, AUTO.

Reset modes

• Manual mode: To reset the device after an overload, the Reset button must be pressed. In this mode, the corresponding LED lights up.
• Semi-automatic mode: Allows the device to automatically reset the system three times in case of overload and then waits for a manual reset on the next fault. The corresponding LED lights up.
• Automatic mode: The device allows the system to automatically reset every time an overload fault occurs. The corresponding LED lights up.

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

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>): 290-400 A
• Delay time: 1-200 s
• Connection type: clamp connection
• Contacts: 5 A / 250 V AC (active load)
• Cable diameter: 2.5 mm²
• Weight: max. 250 g
• Installation: DIN rail
• Maximum altitude: <2000 m

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

The TRM-400 can be used with the 400/5 current transformer included with the TRM-400.

Basic