Gefran expands its GPC power controller range

Intensive thermal processing sectors—including metallurgy, advanced ceramics, glass manufacturing, and chemical processing—are undergoing rapid electrification to reduce direct Scope 1 greenhouse gas emissions. Replacing conventional fossil-fuel-fired gas burners with electric resistance or induction heating elements requires managing significantly larger electrical loads across factory distribution networks. In high-power installations, managing megawatts of thermal power historically required paralleling multiple medium-capacity silicon-controlled rectifier (SCR) power packs or configuring sprawling multi-cabinet lineups. This fragmented hardware footprint increases panel infrastructure costs, complicates three-phase busbar routing, and multiplies control wiring points. Furthermore, managing high current draws across resistive heating banks with low cold-state resistance, such as silicon carbide (SiC), molybdenum disilicide (MoSi2), or graphite elements, introduces severe inrush currents, thermal cycling shocks, and supply harmonic distortions that degrade power quality if not controlled with high-precision phase-angle and burst-firing algorithms. Resolving these electrical challenges requires consolidated, high-power-density solid-state controllers capable of managing large currents within compact physical envelopes.

High Current Density and Panel Footprint Consolidation
To meet the electrical demands of large-scale industrial heating, Gefran has expanded its GPC power controller family with the addition of 720 A and 870 A models, extending the platform's upper envelope from 600 A up to 870 A. This expansion creates a unified, scalable power control architecture covering continuous load currents from 40 A to 870 A across a common configuration framework.

The high current ratings allow industrial furnace builders, original equipment manufacturers (OEMs), and system integrators to manage higher power levels using fewer discrete devices. By consolidating power stages into single units, engineers can simplify overall electrical schematic designs and develop larger heating installations without relying on complex parallel device topologies. Engineered for high power density, the GPC chassis achieves an optimized power-to-footprint ratio that allows operators to mount two GPC units within the physical panel volume traditionally occupied by a single conventional SCR power controller. This compact layout reduces the required footprint of control enclosures, cuts internal cabinet wiring and ventilation infrastructure expenditures, and simplifies brownfield retrofit projects by enabling facilities to scale up installed heating capacity without expanding existing electrical enclosure dimensions.

Target Industrial Applications and Scalability
The new GPC 720 A and 870 A frames are developed specifically for high-power, multi-zone thermal environments. Primary application areas include high-temperature industrial furnaces, metal heat-treatment and annealing lines, electric immersion and process gas heaters in the oil and gas sector, and complex multi-zone thermal arrays.

Standardizing across a single controller architecture from 40 A to 870 A provides operational continuity for engineering teams, streamlining initial commissioning, parameter parameterization, and plant maintenance across the entire equipment lifecycle. The higher current thresholds enable facilities to drive larger heating elements, govern expanded multi-zone heating banks, and enhance furnace throughput to meet aggressive electrification timelines.

Additional Context
This section details technical specifications and competitive benchmarking not included in the original product announcement.

In industrial electric heating governed by international standards such as IEC 60947-4-3 for AC semiconductor controllers and contactors for non-motor loads and IEC 60519 for safety in electroheating installations, solid-state thyristor power controllers manage power delivery using distinct firing modes. These include phase-angle firing, zero-crossing burst firing, and single-cycle or half-cycle firing algorithms. While phase-angle control is essential for managing transformer-coupled loads and heating elements with sharp temperature coefficients of resistance—such as silicon carbide or molybdenum disilicide, where cold resistance is a fraction of hot resistance—it generates steep voltage and current wavefronts that inject line harmonics and degrade overall power quality. High-power thyristor controllers in the 700 A to 900 A range integrate digital firing logic that pairs soft-start current limiting with cycle-by-cycle phase synchronization to prevent upstream transformer saturation. Furthermore, managing heat dissipation at 870 A requires integrated semiconductor-protection high-speed fuses and forced-air cooling across heavy heat sink extrusions to keep internal thyristor junction temperatures safely below thermal breakdown thresholds.

Within the heavy industrial electric heating and power controller market, Gefran’s expanded GPC series benchmarks directly against established solid-state power controller families, including Eurotherm and Watlow modular platforms such as the EPack and EPower series, Advanced Energy’s Thyro-A and Thyro-PX families, and CD Automation’s REVO and REVEX lines. While modular platforms like Watlow's EPower provide field-configurable power modules and software-managed load shedding across multi-channel inputs, their broader physical enclosures demand substantial horizontal panel real estate. Conversely, Advanced Energy's Thyro-PX provides advanced mains load optimization and harmonic compensation algorithms, but requires specialized engineering software tools during plant commissioning. By doubling effective power density compared to standard market form factors and maintaining hardware and configuration continuity from 40 A up to 870 A, Gefran positions the GPC as a compact drop-in solution for machine builders carrying out panel revamps and high-temperature furnace conversions where enclosure volume is strictly limited.

Edited by Romila DSilva, Induportals Editor, with AI assistance.