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Vendor: TENSE

Supervisory/protective three-phase relay for overvoltage, undervoltage, asymmetric sequence monitoring

Barcode: FKV-03HF
€35,20 €28,85 excl. VAT
€35,20 €28,85 excl. VAT
Low stock: 10 left
  • Description
  • User Manual
  • Payment methods
  • Warranty

TENSE phase protection relay - adjustable asymmetry 5-50%

The phase protection relay from TENSE (Turkey) is designed to protect three-phase electric motors and other three-phase equipment from electrical network faults. The device checks correct phase sequence, phase asymmetry, undervoltage, and overvoltage, and ensures safe load disconnection when set limits are exceeded.

Due to its wide range of settings, the relay is suitable for most industrial and commercial applications, especially where precise and stable motor protection is required.

Key features

  • Phase sequence monitoring - protection against incorrect wiring.

  • Adjustable asymmetry: from 5% to 50%.

  • Adjustable undervoltage: 260-360 V AC.

  • Adjustable overvoltage: 400-480 V AC.

  • Adjustable fault delay time (Err In): 1-30 s.

  • Adjustable recovery time (Err OUT): 1-30 s.

  • Clear display on a 3 × 3-segment screen.

  • High accuracy and fast response to network faults.

  • Mounting on a standard DIN rail.

Operating principles

Normal operation

When all phase voltages are within limits and the phase sequence is correct:

  • The relay is triggered,

  • The OUT LED lights up.

High voltage error (H)

  • If the phase exceeds the set limit → wait for the Err In time, H. appears

  • The relay switches off, OUT indicator goes off.

  • When 5 V falls below the set value, Err OUT activates, the relay switches on again.

Low voltage error (L)

  • Drop below set limit → Err In wait, L. is displayed.

  • The relay switches off.

  • When voltage rises 5 V above the limit → Err OUT wait, the relay switches on.

Phase asymmetry (Asy)

  • If the voltage difference between phases exceeds the set limit (5-50 %):

    • ASy appears after Err In time, the relay deactivates.

  • When asymmetry decreases below (set threshold - 2 %) → Err OUT wait time, the relay switches on.

Phase sequence error (pHs)

  • When a phase sequence error occurs, the relay waits for Err In, then displays pHs.

  • The relay switches off and remains off until the correct sequence is restored.

  • When the phase sequence is corrected, Err OUT appears and the relay switches on.

Technical parameters

Parameter Value
Operating voltage (Un) 3 × 380 V AC + N
Frequency 50/60 Hz
Input power < 6 VA
Ambient temperature -20 °C to +55 °C
High voltage threshold 400-480 V AC
Low voltage threshold 260-360 V AC
Asymmetry 5-50 % (adjustable)
Error time (Err In) 1-30 s
Reset time (Err OUT) 1-30 s
Relay contact 5 A / 250 V AC (resistive load)
Display 3 × 3 segments, 1 LED
Mounting DIN rail
Weight < 150 g
Maximum installation height < 2000 m
Cable cross-section up to 2.5 mm²

Online payment by card - after completing the order you will be redirected to the payment gateway, payment confirmation will be sent to your e-mail

COD - you pay the payment by money order to the carrier's driver

By bank transfer - no later than the next working day, you will receive an advance invoice to your e-mail, which contains the account number that you will enter when making the payment.

On pro forma invoice - this payment option is available to partners who have signed a framework agreement with our company.

​If you want to use the last 2 methods, please call our manager and he will give you instructions on how to receive an invoice with or without VAT.

The electrical equipment we supply meets high quality standards, has a 24-month warranty, and meets all EU requirements.

In the event of a complaint, the return of goods will not be charged.

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