DAS Company is an authorized Voltek distribution partner, stocking and supplying the complete Voltek power quality and voltage protection portfolio — over/undervoltage protection relays, three-phase monitoring relays, automatic voltage regulators (AVR), phase failure and asymmetry relays, and surge protection devices — to panel builders, electrical contractors and industrial engineers across Europe from our Bulgaria distribution base.
Voltek voltage protection relays monitor supply voltage continuously and disconnect the load when voltage exceeds or falls below user-adjustable thresholds — protecting motors, compressors, HVAC equipment and sensitive electronics from the equipment damage caused by sustained overvoltage or undervoltage conditions. Single-phase voltage protection relays (230V AC) cover final circuit appliance protection — refrigeration compressors, air conditioning units and process equipment susceptible to voltage fluctuation damage. Three-phase voltage protection relays monitor all three phases simultaneously for overvoltage, undervoltage, phase failure, phase sequence reversal and voltage asymmetry — providing comprehensive motor protection in industrial motor starter panels and pump control panels. Adjustable trip thresholds (typically ±10–30% of nominal voltage), adjustable time delay (avoiding nuisance trips from brief supply transients) and automatic reconnection after voltage recovery eliminate manual intervention requirements in unmanned plant rooms and remote pump stations. All Voltek voltage relays mount on standard 35 mm DIN rail and carry CE marking for European panel installation.
The Voltek three-phase monitoring relay range provides dedicated protection against the most damaging power quality disturbances for three-phase motor installations — phase failure (open phase), phase sequence reversal, phase asymmetry (voltage unbalance) and combined over/undervoltage. Phase failure is the single most common cause of three-phase motor burnout: when one supply phase is lost due to a blown fuse or supply fault, the motor continues to run on two phases, drawing excessive current in the remaining phases until the winding overheats and fails. A Voltek phase failure relay detects the loss within 100–500 ms and disconnects the motor via the control circuit — preventing the thermal damage that a standard thermal overload relay may not detect quickly enough. Phase asymmetry protection monitors the percentage difference between the three phase voltages; when asymmetry exceeds the adjustable threshold (typically 3–10% unbalance), the relay trips before the resulting negative sequence current causes additional motor heating above the rated temperature rise. Phase sequence protection prevents reverse rotation when reconnecting a motor after a supply maintenance intervention — critical for pumps, compressors and fans where reverse rotation causes mechanical damage or process disruption.
Voltek automatic voltage regulators provide continuous, stepless voltage regulation — maintaining a stable output voltage within ±2–5% of nominal regardless of supply fluctuations — for sensitive electronic equipment, laboratory instruments, medical devices, CNC machine tools and telecommunications equipment that cannot tolerate the voltage variation present on many Eastern European and developing market utility networks. Single-phase AVR units (0.5 kVA to 20 kVA) cover individual equipment protection applications; three-phase AVR systems (5 kVA to 500 kVA) cover complete facility supply protection for industrial buildings, data centres and hotels in regions with unreliable grid voltage. Servo-motor type voltage regulators provide wide input voltage range correction (typically ±20–30% of nominal) — exceeding the correction range available from relay-tap type stabilisers for sites with severe, sustained voltage deviation. The output is maintained at the set nominal voltage throughout the correction range, protecting downstream equipment from the combined effects of voltage sag, swell and fluctuation.
Voltek surge protection devices protect electrical installations and connected equipment from transient overvoltages caused by lightning-induced surges, switching transients and power grid disturbances. Type 1 SPDs (lightning current arresters, installed at the main distribution board / service entrance) limit the energy of direct and indirect lightning strikes before it reaches the building installation — mandatory in structures with lightning protection systems to IEC 60364-5-53 and IEC 62305. Type 2 SPDs (surge arresters, installed at sub-distribution boards) protect sub-circuits from residual surges that pass through Type 1 devices and from internally generated switching transients. Type 3 SPDs (point-of-use protection, installed at socket outlets and equipment supply points) provide fine protection for individual sensitive electronic loads — computers, PLCs, instrumentation and communication equipment. All Voltek SPDs are available in DIN-rail mounting format for panel installation, carry IEC 61643-11 (AC power SPD) certification and include remote signalling contact for integration with BMS monitoring or alarm panels.
Voltek voltage monitoring relays provide continuous display and alarming of supply voltage without control relay output — used for monitoring purposes in main distribution panels, generator changeover panels and UPS systems where voltage status must be visible to maintenance personnel without automatic disconnection action. Digital panel meters (DIN 96×96 mm, DIN 72×72 mm) with LED or LCD display measure and display single-phase or three-phase voltage, current, power, power factor and energy — providing the basic power quality measurement capability for energy monitoring, KWh sub-metering and load management applications in industrial and commercial distribution panels without a dedicated power quality analyser instrument.
DAS Company provides access to current Voltek pricing for authorized B2B buyers across Europe. Product categories with available pricing include single-phase and three-phase voltage protection relays (by voltage rating and protection function), three-phase monitoring relays (phase failure, asymmetry and sequence), automatic voltage regulators (by kVA rating and phase), Type 1/2/3 surge protection devices (by maximum discharge current and voltage protection level) and digital panel meters. Contact our sales team for volume pricing and project quotations.
