Tense FKT-06PF Phase Sequence and Phase Failure Relay (with PTC)
The Tense FKT-06PF is an advanced industrial grade monitoring device engineered to safeguard three phase motors and mechanical systems from destructive power line faults and thermal overload. Housed in a space saving modular DIN rail enclosure, this multi protective relay actively senses for phase loss, phase sequence reversal, line asymmetry, and winding over temperature conditions through integrated PTC thermistor monitoring.
Key Features
-
Dual Electrical & Thermal Protection: Combines comprehensive phase supervision with dedicated motor winding temperature monitoring, providing multi layered machinery security.
-
Adjustable Asymmetry Threshold (
% ASM): Features a front manual potentiometer allowing operators to scale the acceptable voltage imbalance from 5% up to 25%, isolating the contactor if phase variations drop past safe operating limits. -
Configurable Delay & Reset Buffers (
DT/RT): Outfitted with independent Delay Time (DT: 0.1 – 20 sec.) and Reset Time (RT: 0.1 – 20 sec.) control dials to prevent nuisance tripping caused by momentary transformer switching or brief voltage dips. -
Comprehensive 4-LED Status Array: Built with high-visibility diagnostic lights indicating exact fault locations at a glance:
-
Normal Output Status (Green LED): Lights up when all phase sequences, voltages, and thermal loops are optimized.
-
Phase Failure / Sequence (Red LED): Illuminates steady when active phases are crossed or missing entirely.
-
Asymmetry Error (
Asm.Red LED): Lights up when phase imbalances breach configured settings. -
PTC Thermal Overload (Red LED): Triggers when high mechanical friction or load issues cause motor windings to overheat.
-
-
Integrated PTC Resistance Terminals: Structured with specific top entry terminal blocks designed to receive direct inputs from embedded motor thermistors.
Technical Specifications
| Feature | Specification |
| Model Code | FKT-06PF |
| Brand / Manufacturer | Tense Electronics |
| Nominal Operating Voltage (U_n) | 3 X 380V AC + Neutral |
| Grid Operating Frequency | 50/60 Hz dual-system capability |
| Asymmetry Adjustment Range | 5% – 25% (Adjustable dial) |
| Delay / Reset Windows | 0.1 sec. – 20 sec. (Independent dials) |
| Auxiliary Output Rating | SPDT dry relay contact rated for 5A / 250V AC (Resistive Load) |
| Mounting Configuration | Standard 35 mm DIN Rail Snap on Enclosure |
| Manufacturing Origin | Made in Turkey |
Applications
-
Heavy Duty Industrial Motor Protection: Installed in Motor Control Centers (MCC) to preserve the integrity of large induction motors, conveyors, and processing gearboxes against overheating from voltage anomalies or single phasing.
-
Submersible and High Pressure Pumps: Shielding wastewater and deep well agricultural pump motors where mechanical resistance spikes could quickly cause thermal motor burnouts.
-
Industrial Lift and Crane Controls: Serving as a crucial phase sequence verifier to block accidental crane or elevator hoist counter rotation before high current contactor coils fire up.
-
Commercial Ventilation and Exhaust Arrays: Monitoring factory blower networks to isolate downstream hardware during facility utility brownout seasons.
