Digital overload relay TRM-12 - 3-phase, 0.1-25 A, LED display, timer

Product description

TENSE TRM-12 digital thermal relays are designed to protect loads from overcurrent damage.
They allow setting overcurrent, fault delay time, and operating mode.

They feature internal current transformers and a 3 × 3 digit LED display for clear operation monitoring.

Key features

• Adjustable overcurrent value: 0.1-25 A

• Fixed current asymmetry: 50%.

• Adjustable fault delay time: 0.1-20 s

• Operating modes: Manual, semi-automatic, automatic

• Three-phase operation with built-in current transformers

• LED status indication: OUT, ERR

• Display range: 3 × 3 digits + 5 LEDs

Operating principle

• When power is supplied, the relay turns on and activates the output contact, and the OUT indicator lights up.

• When the set overcurrent value is exceeded, the delay time starts counting and the ERR indicator lights up.

• When the time elapses, the relay switches off, the output contact deactivates, and OUT goes out.

• Depending on the selected mode, the relay is reset automatically or manually:

  • Manual: after an error, a manual reset is required.

  • Semi-automatic: automatic reset 3 times, then manual reset.

  • Automatic: automatic reset each time an error occurs.

50% asymmetry

• If the difference between the maximum and minimum phase current exceeds 50%, the relay enters asymmetry error mode.

• The error is indicated by flashing displays and the ERR indicator.

• A manual reset is required to return to normal operation.

• Currents below 2 A are not monitored.

Technical parameters

• Power supply voltage: 150-260 V AC, 50/60 Hz

• Power consumption: < 6 VA

• Operating temperature: -20 °C to +55 °C

• Display: 3 × 3 digits, 5 LEDs

• Overcurrent setting: 0.1-25 A

• Delay time: 0.1-20 s

• Connection type: terminal

• Output contacts: 5 A / 250 V AC

• Wire cross-section: 2.5 mm²

• Mounting: DIN rail

• Weight: max 250 g

• Altitude: < 2000 m

Application

• Automatic disconnection of devices when maximum current is exceeded

• Protection of motors, heaters, transformers, and other three-phase equipment

• Prevention of equipment damage due to asymmetrical phase load