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Media gallery
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Media gallery
Three-phase monitoring/protection relay for phase failure/overvoltage/asymmetry/surge control
- Regular price
- €20,47 €16,92 excl. VAT
- Regular price
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- Sale price
- €20,47 €16,92 excl. VAT
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Phase protection relays - FKV-24F | TENSE
The FKV series phase protection relays are designed to protect three-phase equipment, especially motors, against damage due to incorrect voltage values, asymmetry, phase failures, or incorrect phase sequence. The FKV-24F operates in a wide 180-500 VAC range and has a fixed asymmetry of 11%.
It ensures reliable operation of equipment with high demands on power precision and protects them from thermal and mechanical damage.
Features and operating principle
Voltage asymmetry (11%)
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Monitors the difference in phase voltages.
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If asymmetry exceeds 11%, the relay switches off the output after approximately 1 s and opens the NO/COM contacts.
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If the difference drops by 5 V, the relay evaluates the state as normal and resumes output operation after a delay period.
Phase sequence check
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Correct phase sequence → OUT LED lights up, output is active (NO closed).
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Incorrect phase sequence → LED turns off, and the output switches to a fault state.
High voltage protection (U>)
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If the voltage exceeds 500 V, a high voltage indication is activated.
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If the condition persists for more than 2 s, the relay disconnects the output.
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When the voltage drops by 5 V below the U> limit, the relay starts a delayed countdown and then resumes operation.
Low voltage protection (U<)
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If the voltage drops below 180 V, a low voltage indication is activated.
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If the condition does not end during the error delay, the output switches off.
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If the voltage rises by 5 V above U<, after a delay period, the relay reactivates the output.
Status indications
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5 LEDs provide information about:
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relay status (OUT)
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high voltage (U>)
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low voltage (U<)
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phase sequence
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asymmetry / error
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Key functions
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Wide operating voltage range: 180-500 VAC
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Fixed asymmetry: 11%
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Protection against:
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Undervoltage
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Overvoltage
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asymmetry
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phase sequence errors
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phase failures
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No neutral wire required
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Fast reaction to fault conditions (approx. 1 s)
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LED indication of all functions
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Suitable for motors, compressors, pumps and other three-phase loads.
Technical parameters
| Parameter | Value |
|---|---|
| Operating voltage (Un) | 3 × 380 VAC |
| Operating range | 180-500 VAC |
| Operating frequency | 50/60 Hz |
| Operating power | < 4 VA |
| Asymmetry | 11% (fixed) |
| Low voltage U< | 180 V (fixed) |
| High voltage U> | 500 V (fixed) |
| Indication | 5× LEDs |
| Contact | 5 A / 250 VAC (resistive load) |
| Wire diameter | up to 2.5 mm² |
| Operating temperature | -20 °C to +55 °C |
| Weight | < 110 g |
| Installation | DIN rail |
| Protection degree | IP20 |
Online payment by bank card – after placing the order, you will be redirected to the payment portal. You will receive payment confirmation in your email.
Cash payment upon delivery – you will pay the amount specified in the payment notice to the courier upon delivery.
Payment by bank transfer – a prepayment invoice (proforma) will be sent to your email address no later than the next business day, indicating the bank account number to which the payment should be made.
Payment by invoice – this option is available to cooperation partners who have a cooperation agreement with our company.
If you wish to use one of the last two payment methods, please contact our customer service specialist, who will provide instructions on receiving an invoice with or without VAT.
The electrical equipment we supply meets high-quality standards, comes with a 24-month warranty, and fully complies with all European Union requirements.
We also offer free delivery for orders over 100 EUR, as well as a flexible discount and promotion system. Our employees' technical knowledge and experience allow us to provide professional consultations and, if necessary, offer alternative electrical product solutions.
