Electrical Specifications

• Supply voltage (three‑phase): Typically 380‑480 V AC (or variant 200‑240 V/415‑480 V) at 50/60 Hz.

• Current rating: Many models are rated from tens of amperes up to several hundred amperes. For example, typical three‑phase thyristor regulators may range from 25 A to 750 A according to the manufacturer’s product class.

• Control input: Analogue (e.g., 0‑10 V, 4‑20 mA) or digital input; galvanically isolated from power circuit.

• Control mode: Phase‑angle control (adjusting conduction angle each half‑cycle) or burst‑fire control (switching full cycles) or combination, to accommodate different load types (resistive vs inductive).

• Load type compatibility: Supports resistive loads (heaters), inductive loads (motors, coils) and mixed loads when properly selected.

• Minimum load requirement / leakage current: Some modules require minimum current to guarantee stable triggering; leakage when off should also be specified.

• On‑state voltage drop / dissipation: The thyristor module dissipates some heat during conduction; ensure heatsink and ambient conditions are accounted for.

• Power regulation range: 0‑100% of load (depending on control signal and conduction angle).

• Response time: Very rapid compared to mechanical switches — in the order of milliseconds from control signal change to output adjustment.

Selection Chart

Model Code Breakdown – DSPR-3-100A-P-WC

Mechanical & Mounting

• Mounting type: Unit is designed for panel or chassis installation; heavy‑duty terminals for each phase, separate control terminal block.

• Cooling requirement: External heatsink or integral heatsink with forced ventilation may be required when operating near the rated current, or in high ambient temperature.

• Dimensions & weight: Varies by current rating; larger current models are physically larger and heavier.

• Terminals: Load side screws/busbars capable of rated current, control input terminals for analogue/digital wiring.

• Ambient temperature rating: For example, typical industrial modules might operate from −10 °C to +50 °C (derating above +40 °C).

• Mounting clearance: Adequate airflow and clearance around the unit to dissipate heat; usually top/bottom or side clearance specified.

Environmental & Protection Features

• Operating temperature range: As above; storage temperature typically wider (e.g., −20 °C to +70 °C).

• Humidity: Non‑condensing environment up to, e.g., 90% RH (verify for the unit).

• Over‑temperature protection: Built‑in thermal cut‑out or sensor to shut down or derate in case of heatsink overheating.

• Over‑current / short‑circuit protection: Unit may have current‑limit or trip functions; upstream protection (semiconductor fuses or circuit breakers) recommended.

• Galvanic isolation: Control circuit isolated from mains to meet safety standards.

• Ingress Protection / Safety: Enclosure rating (IP20 or higher, if applicable); compliance with IEC/EN standards for industrial power modules.

• EMI / harmonic considerations: Because phase‑angle switching produces harmonics and transients, it’s recommended to use filters, snubber networks and proper grounding practices.

• Altitude, vibration, shock: Standard industrial ratings apply; check the datasheet for details on vibration and shock tolerance.

Functional Characteristics

• Switching mode:

  • Phase‑angle mode: thyristor triggers at adjustable angle in each half‑cycle; provides fine control of output voltage.

  • Burst‑fire mode: full cycles are switched on/off; useful for inductive/heavy loads or high inertia systems.

• Control signal mapping: Linear relationship between input (0‑10 V or 4‑20 mA) and output power/voltage (0‑100%).

• Linearity and repeatability: Good precision of output relative to control signal, enabling stable process control.

• Minimum load / leakage: Some units require a minimum load current for stable conduction; also may have a small leakage current when off—important for sensitive loads.

• Heat dissipation and derating: As current increases or ambient temperature rises, unit may need derating (reduce current) to maintain safe junction temperature.

• Maintenance & indication: Some units include LED indicators or status outputs (fault, phase loss, over‑temperature) for alarm and monitoring functionality.

• Integration: Suitable for control panels—may interface with PLCs or automation systems. Provide appropriate wiring, control wiring separation, and grounding.

Certifications & Compliance

• CE marking (for European‑compatible versions).

• RoHS compliance (lead‑free components).

• Designed per industrial switching device standards (e.g., IEC 60947, IEC 60068 for environmental).

• Safety agency approvals may apply depending on region / variant.

• Datasheet must be consulted for local product variant and compliance to Indian standards (e.g., IS/IEC, BIS) if used in India.

Installation & Maintenance Guidelines

• Mount the regulator on a flat metal surface or dedicated heatsink; ensure ventilation and clearance as per datasheet.

• Use cables and busbars rated for the current plus margin; tighten terminals to specified torque to avoid hot spots.

• Provide semiconductor‑grade fusing or circuit breaker upstream.

• Separate high‑current wiring and control wiring to avoid interference; shield control wiring if required.

• Inspect periodically: ensure heatsink remains free of dust, verify that terminal temperature is within acceptable limits (no hot spots).

• When operating near maximum rating or in elevated temperature, consider forced cooling or derated operation.

• Replace or service the unit if any indicators show fault, or if terminal connections show signs of overheating (discolouration, oxidation).

Typical Applications

• Large three‑phase heater banks in industrial ovens, kilns, drying lines or thermal processes.

• Three‑phase motor power regulation for conveyors, mixers, pumps (when speed/power modulation required).

• Transformer loads or induction heating systems requiring smooth power control.

• Automation‑controlled manufacturing equipment where precise three‑phase power modulation is critical.