Tufvassons AB industrial transformers, power supplies, and autotransformers

Swedish industrial isolating transformers AFM/AVM, encapsulated PFM units, DIN-rail PSS modules, and variable autotransformers engineered by Tufvassons AB.

Tufvassons AFM series isolating transformers for machine tool networks

Single-phase isolating transformers of the AFM series provide dependable galvanic isolation across industrial auxiliary voltage networks. Robust structural frames and high-grade winding insulation guarantee uninterrupted operational stability for sensitive factory automation modules.

High dielectric strength rated at 4.2 kV effectively isolates hazardous voltage peaks
Optimized magnetic core architecture significantly minimizes internal heat build-up
Durable screw terminal connectors ensure steady grip for heavy distribution wiring
Nominal load range spanning 1100 to 1500 VA suited for automated manufacturing lines

Compact enclosed transformers of AVM line featuring IP44 ingress grade

Industrial transformers of the AVM line are engineered for stationary mounting in harsh workshop environments requiring tight protection. The sturdy impact-resistant outer housing prevents mechanical damage and guards internal electrical components against moisture intrusion.

Reliable IP44 degree of ingress protection guards windings against liquid splashes
Dual input connection taps for 230 V and 400 V facilitate versatile site integration
Integrated thermal protection trip prevents catastrophic magnetic overheating faults
External mounting brackets enable rigid mechanical fixation inside switchboards

Resin-encapsulated PFM transformers enclosed in thermoplastic housing

The PFM product family features thorough resin potting inside flame-retardant polymer housings, delivering resilient endurance against heavy mechanical vibrations. It stands as an ideal choice for powering portable shop equipment and precision instrumentation sensors.

Complete resin encapsulation fully eliminates internal condensation infiltration risks
Self-extinguishing engineering polymer matches stringent fire safety regulations
Compact footprint incorporating reinforced cable entry glands for mobile operation
Negligible audible hum achieved via complete dampening of magnetic laminations

Modular PSS series safety transformers tailored for standard DIN rail

Compact PSS transformers are engineered specifically for low-voltage control panels and building management systems. Standardized snap-on mounting on 35 mm DIN rails enables swift modular assembly inside power distribution enclosures without extra metal adapters.

Direct snap-on mounting to 35 mm DIN rail profiles conserves panel real estate
Safe secondary output of 24 V AC perfectly adapted for programmable controllers
Integrated electronic short-circuit protection prevents equipment downtime hazards
Touch-proof screw terminal rows ensure full compliance with operator safety rules

Heavy-duty industrial transformers of PVS line built for severe sites

PVS transformers feature IP54 protection designed for harsh operating environments including agricultural facilities and outdoor heating. High-performance thermoplastic enclosures retain tensile elasticity under severe freezing temperatures and intense humidity.

Rigorous IP54 sealing shields internal coils against dust ingress and water spray
Corrosion-resistant outer polymer withstands chemical fumes and aggressive moisture
Extended thermal operating window ranging from minus 25 to plus 40 degrees Celsius
High mechanical endurance intended for unmonitored round-the-clock factory duty

Variable toroid autotransformers of OIEA series for testing benches

OIEA toroidal variable autotransformers deliver smooth adjustment of alternating output voltage spanning zero to 260 V. The precision graphite brush mechanism and high-permeability magnetic ring core avoid waveform harmonic distortions across the entire regulation sweep.

Stepless smooth voltage regulation across full sweep from zero to 260 volts
Durable graphite contact brush engineered for minimal dynamic interface resistance
Rigorous compliance with European standard EN 61558-2-14 for variable equipment
Calibrated rotary control dial with explicit scale for precision laboratory benches

Swedish electrical engineering heritage of Tufvassons and industrial quality criteria

Swedish industrial manufacturer Tufvassons was established in 1938 by entrepreneur Birger Tufvasson and developed across decades into a reputable Scandinavian power equipment provider. Central engineering facilities and assembly lines operate in Arlandastad along Halmsjovagen.

The company executes a comprehensive production cycle covering coil winding, core assembly, and automated testing.

Multi-stage factory inspection verifies dielectric strength across winding insulation under high voltage potentials, monitors heat dissipation under full load conditions, and assesses environmental endurance.

Manufactured equipment complies with European EN 61558 regulations, ensuring uninterrupted dependability within machine tool cabinets and automated assembly lines.

Engineering selection criteria for AFM and AVM isolating transformer units

Selecting isolating transformers across AFM and AVM product families requires evaluating cumulative electrical load demands, primary grid supply characteristics, and workshop atmospheric conditions.

Units supplying 115 V secondary circuits serve imported technological machinery, preventing parasitic ground loops and suppressing high-frequency transient interference.

Stationary installation within industrial workshops subject to moisture condensation calls for AVM units featuring IP44 ingress grade.

Robust mounting brackets ensure steady mechanical retention on control backplates, while dual-sided terminal strips with legible phase identification prevent wiring errors during routine electrical maintenance.

Operational guidelines for resin-encapsulated PFM transformers in workshop environments

The PFM product family incorporates thorough resin potting inside rigid impact-resistant thermoplastic housings, delivering complete protection for magnetic windings against corrosive fumes and oil aerosols.

The structure easily withstands intensive mechanical vibration and dynamic shocks characteristic of mobile testing benches and transportable shop tools.

Connecting transportable equipment demands careful inspection of flexible cable glands and external protective polymer shells.

Self-extinguishing properties of the polymer housing prevent propagation of open flames during accidental overcurrent events, while high-conductivity internal potting transfers thermal energy efficiently toward exterior cooling fins.

Installation procedures for modular PSS safety transformers on 35 mm DIN rails

Compact PSS modular transformers mount directly onto standard 35 mm DIN rails inside automation cabinets and alarm monitoring enclosures.

The secondary winding delivers an intrinsically safe alternating output of 24 V, essential for powering programmable industrial controllers, analog sensors, and panel indicator lamps without interruptions.

An integrated semiconductor protection component promptly interrupts electrical current when detecting winding short circuits or heavy line overloads, resetting automatically upon cooling.

Compact unit dimensions conserve valuable mounting space along the DIN rail, facilitating dense component grouping without thermal disturbance to neighboring circuit breakers.

Deploying moisture-resistant PVS industrial transformers across demanding environments

PVS transformer units are engineered for continuous operation across adverse operational environments including outdoor pumping stations, agricultural buildings, and mining facilities.

The sealed housing rated at IP54 ingress protection shields internal electrical conductors from direct water jets, abrasive shop dust, and airborne salt particles.

The corrosion-resistant polymer shell remains immune to oxidation when exposed to prolonged humidity and chemical vapors.

Distribution and supply wiring enters via flexible membrane cable glands that maintain tight sealing during seasonal ambient temperature fluctuations spanning minus twenty-five to plus forty degrees Celsius.

Calibration and maintenance rules for OIEA variable toroidal autotransformers

Laboratory toroidal autotransformers of the OIEA product line provide smooth stepless regulation of alternating output voltage from zero to 260 V under dynamic electrical loads.

Units integrate into calibration panels, research installations, and incoming electrical inspection benches, delivering an almost perfect sinusoidal waveform output.

Routine technical servicing involves periodic inspection of the circular conductive core track and measurement of residual graphite brush thickness.

If workshop dust or carbon deposits appear, the contact face is cleaned gently with a soft lint-free cloth without abrasive compounds, preserving stable electrical contact resistance and smooth rotation.

Tufvassons AB and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Tufvassons AB and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.