SCR Module

Product Specifications

Technical details and manufacturing context for SCR Module

Definition

The SCR Module is a power electronic component used as the main switching and power control element in power regulation systems such as SCR controllers or power regulators. It contains one or more Silicon Controlled Rectifiers (SCRs) along with associated circuitry, and is designed to regulate the flow of electrical current to a load, such as a heating element, motor, or lighting system. By controlling the firing angle of the embedded SCRs, the module enables phase-angle control of AC power, allowing for variable output voltage and power adjustment. The module receives a low-power control signal from the controller's logic circuit, which determines the precise point within each half-cycle of the AC input voltage waveform at which the SCRs are triggered into conduction. This firing angle delay controls the portion of the AC waveform delivered to the load, thereby regulating the average power output. Once triggered, an SCR remains conducting until the current through it drops to zero at the end of the half-cycle. The SCR Module is typically used in industrial applications requiring precise power control, such as temperature control in furnaces, motor speed control, and lighting dimming. It is available in various configurations and ratings, with typical rated voltages from 400 to 1200 V, rated currents from 20 to 300 A, and surge current capabilities from 300 to 5000 A. The module includes a heat sink for thermal management, and its construction uses materials such as silicon for the semiconductor die, copper for terminals and busbars, aluminum for the heat sink, and ceramic or epoxy for insulation and packaging. When selecting an SCR Module, it is essential to verify model-specific parameters, including voltage, current, surge current, gate trigger voltage and current, on-state voltage, operating and storage temperature ranges, isolation voltage, thermal resistance, mounting torque, and weight. These values must be confirmed with the legal manufacturer or supplier for the specific application, as they may vary by model. The module is designed to meet relevant industry standards, such as IEC 60747-6, which serves as a procurement and verification reference. Always consult the manufacturer's datasheet and application guidelines to ensure proper installation and operation.

Working Principle

The SCR Module operates on the principle of phase-angle control. It receives a low-power control signal, often a DC voltage or pulse, from the controller's logic circuit. This signal determines the precise point within each half-cycle of the AC input voltage waveform at which the SCR(s) are triggered into conduction ('fired'). By delaying this firing angle, the module controls the portion of the AC waveform delivered to the load, thereby regulating the average power output. Once triggered, an SCR remains conducting until the current through it drops to zero at the end of the half-cycle.

Common Materials

Silicon (for SCR semiconductor die), Copper (for terminals and busbars), Aluminum (for heat sink), Ceramic or Epoxy (for insulation and packaging), Plastic (for housing)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	400–1200 V	Maximum repetitive peak off-state voltageIEC 60747-6
Rated Current	20–300 A	Average on-state current at case temperatureIEC 60747-6
Surge Current	300–5000 A	Non-repetitive peak surge currentIEC 60747-6
Gate Trigger Voltage	1.5–3 V	Minimum gate voltage to trigger conductionIEC 60747-6
Gate Trigger Current	30–100 mA	Minimum gate current to trigger conductionIEC 60747-6
On-State Voltage	1.2–1.8 V	Voltage drop at rated currentIEC 60747-6
Operating Temperature	-40–125 °C	Junction temperature rangeIEC 60747-6
Storage Temperature	-40–150 °C	Non-operating storage rangeIEC 60747-6
Isolation Voltage	2500–5000 V RMS	RMS isolation voltage between terminals and caseIEC 60747-6
Thermal Resistance	0.1–1.5 K/W	Junction-to-case thermal resistanceIEC 60747-6
Mounting Torque	2–6 N·m	Recommended torque for mounting screws
Weight	50–500 g	Typical weight depending on current rating

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

SCR (Thyristor) Die Part
The core semiconductor device that performs the switching action, blocking or conducting current based on gate signals.

Material: Silicon
Gate Drive Circuit
Isolates and conditions the low-power control signal to provide the precise current/voltage pulse needed to reliably trigger the SCR.

Material: Copper, Electronic Components (resistors, optocouplers)
Heat Sink Part
Dissipates heat generated by power losses in the SCR during operation to maintain safe junction temperatures.

Material: Aluminum
Main Terminals (Anode/Cathode) Part
Provide the high-current connection points for the load and power source.

Material: Copper
Gate Terminal Part
Provides the connection point for the low-power control signal from the regulator's controller.

Material: Copper

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	Atmospheric to 1.5 bar (typical enclosure rating)
other spec:	Max current: 10A to 5000A (module dependent), Voltage: 200V to 6500V, dv/dt: 50-1000 V/μs, di/dt: 20-500 A/μs
temperature:	-40°C to +125°C (operating), -55°C to +150°C (storage)

Media Compatibility

✓ Industrial motor control systems ✓ Power supply regulation circuits ✓ Heating element controllers

Unsuitable: High-vibration marine propulsion systems (due to mechanical stress on silicon junctions)

Sizing Data Required

Maximum load current (Amps RMS)
Peak repetitive reverse voltage (Volts)
Required gate trigger characteristics (voltage/current)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Thermal fatigue cracking

Cause: Repeated thermal cycling from power switching creates stress concentrations in solder joints and substrate interfaces, leading to crack propagation and eventual open circuits.

Gate oxide degradation

Cause: Voltage transients exceeding rated gate-source voltage, electrostatic discharge during handling, or prolonged operation near maximum ratings causing gradual breakdown of the insulating oxide layer.

Maintenance Indicators

Audible high-frequency buzzing or arcing sounds during operation indicating loose connections or insulation breakdown
Visible discoloration, bubbling, or charring on the module casing or heat sink suggesting overheating beyond design limits

Engineering Tips

Implement active thermal management with temperature monitoring and derating curves - maintain junction temperatures below 80% of maximum rated temperature through proper heat sinking and airflow design
Install snubber circuits and voltage clamping devices to suppress voltage transients, and enforce strict ESD protocols during all handling and installation procedures

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards

IEC 60747-6 (Semiconductor devices - Thyristors) UL 508 (Industrial Control Equipment)

Quoted from the published standard.

Manufacturing Precision

Gate trigger voltage: +/-0.1V
On-state voltage drop: +/-0.05V

Quality Inspection

Thermal cycling test (-40°C to +125°C)
High-potential (hipot) insulation test

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of SCR Module

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Frequently Asked Questions

What is the typical voltage range for an SCR Module?

According to the directory reference, the rated voltage (maximum repetitive peak off-state voltage) is typically in the range of 400 to 1200 V, as per IEC 60747-6. However, you must verify the exact rating for the specific model with the manufacturer.

How does an SCR Module control power?

It uses phase-angle control. A control signal determines the firing angle within each half-cycle of the AC waveform, delaying the point at which the SCR conducts. This controls the portion of the waveform delivered to the load, thus regulating average power.

What are the key parameters to check when selecting an SCR Module?

Key parameters include rated voltage, rated current, surge current, gate trigger voltage and current, on-state voltage, operating and storage temperature ranges, isolation voltage, thermal resistance, mounting torque, and weight. Always confirm these with the manufacturer for your application.

What standards apply to SCR Modules?

The directory lists IEC 60747-6 as a reference standard for many parameters. This standard is a procurement and verification reference, not proof of certification. Verify compliance with the manufacturer.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Power Regulator / SCR Controller

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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