SANREX Repair Services India
SANREX, a subsidiary of Mitsubishi Electric, is a leading Japanese manufacturer of high-power semiconductor devices and power modules for industrial applications. Known for their robust thyristor modules, diode rectifiers, and IGBT power stacks, SANREX equipment powers critical operations in Indian steel mills, cement plants, and renewable energy installations. Their components are engineered for harsh industrial environments and extreme thermal conditions.
SANREX, a subsidiary of Mitsubishi Electric, is a leading Japanese manufacturer of high-power semiconductor devices and power modules for industrial applications. Known for their robust thyristor modules, diode rectifiers, and IGBT power stacks, SANREX equipment powers critical operations in Indian steel mills, cement plants, and renewable energy installations. Their components are engineered for harsh industrial environments and extreme thermal conditions.
Synchronics Electronics has two decades of expertise repairing SANREX power semiconductors, rectifier modules, and thyristor assemblies used in DC drives, induction heating systems, and welding equipment. Our 180+ engineers handle everything from gate-drive circuit failures to thermal stress damage in SANREX modules. We maintain calibrated test benches for SANREX diode stacks and thyristor blocks, ensuring Indian manufacturers stay operational without costly downtime.
Expert repair of SANREX power modules, thyristors, and high-voltage rectifier assemblies across India.
SANREX Equipment We Repair — By Category
SANREX Product Lines We Repair
Our engineers are trained on the full SANREX product range. Below are the major product families we service.
SANREX Thyristor Modules (SCR / GTO)
High-current thyristor and GTO modules used in DC motor drives, induction furnace power supplies, and railway traction systems. Common issues include gate-cathode leakage, junction temperature cycling damage, and hydrogen embrittlement in older units.
SANREX Power Diode Rectifier Stacks
Multi-stack diode modules for controlled rectification in DC power supplies, electroplating, and arc-welding applications. Faults include forward voltage degradation, reverse leakage current rise, and thermal runaway in parallel-connected modules.
SANREX IGBT Power Modules
Modern insulated-gate bipolar transistor modules for PWM inverters, induction heating, and variable frequency drive cabinets. Common failures: gate-oxide breakdown, collector-emitter short circuit, and solder fatigue at bond-wire interfaces.
SANREX Hybrid Integrated Circuits (HIC)
Gate-drive units, voltage regulators, and control logic hybrid modules integrated into SANREX power stacks. Repairs focus on capacitor drying, resistor network drift, and integrated gate-driver IC replacement.
SANREX Thermal Management Components
Heat-sink assemblies, thermal interface materials, and temperature monitoring sensors for SANREX modules. Issues include thermal paste degradation, aluminum fin corrosion, and thermistor sensor drift in high-humidity Indian plants.
Why Choose Synchronics for SANREX Repairs?
PCB-Level Expertise
We repair down to the component level — not just swap boards. Our engineers identify root causes, replace failed IGBTs, capacitors, processors, and gate drivers on SANREX equipment.
Fast Turnaround
Standard 7–10 working days. Express 3–5 days available for critical breakdowns. Emergency same-day/next-day service for unplanned downtime.
6-Month Warranty
Every repaired unit ships with a 6-month comprehensive warranty on parts and labour. Our repair success rate is over 94% across all brands.
All-India Service
Couriered repairs accepted from any city in India — Vadodara, Mumbai, Pune, Ahmedabad, Surat, Chennai, and more.
Common SANREX Equipment Faults We Fix
Based on 30+ years of repair data, these are the most frequent failure modes we see in SANREX equipment arriving at our workshop.
- ✓SANREX thyristor gate-cathode junction leakage — Extended operation near maximum junction temperature, moisture ingress in module encapsulation, and hydrogen embrittlement of silicon die. Older SANREX SCR units (pre-2005) are especially susceptible in high-humidity environments common in coastal Indian manufacturing zones.
- ✓SANREX power diode stack forward voltage rise — Thermal cycling fatigue causes metallurgical changes at the die-to-stud interface and degradation of the ohmic contact layer. Parallel-connected stacks develop uneven current distribution, accelerating wear in higher-current modules. Common in Indian steel mills running 24/7 rectifier systems.
- ✓SANREX IGBT collector-emitter short circuit — Transient overvoltage events (lightning, load switching, supply spikes) or sustained overstress during firmware faults in the PWM controller. Gate-oxide breakdown allows collector-emitter drain, destroying the IGBT die. Prevalent in Indian industrial sites without adequate surge suppression.
- ✓SANREX solder joint fatigue at bond-wire interfaces — Repeated thermal expansion and contraction cycles cause mechanical stress at lead-frame solder joints and internal bond-wire attachments. Vibration in motor-driven equipment and proximity to heat sources accelerate the fatigue process in SANREX modules operating continuously.
- ✓SANREX thermal interface material (TIM) degradation — Thermal grease hardens, shrinks, and loses contact pressure under sustained 100-120°C operation. Moisture absorption causes pump-out and loss of thermal conductivity. Indian humidity and dust contamination in electrical enclosures compound the problem within 3-5 years of service.
- ✓SANREX gate-drive circuit capacitor drying — Electrolytic capacitors in hybrid gate-drive modules (HIC) lose capacitance and increase ESR under continuous operation at 85-100°C. Lead-acid vapors from nearby battery banks and industrial chemical exposure accelerate electrolyte loss. Typical failure occurs after 8-10 years in Indian factories.
How We Repair Your SANREX Unit
Receive & Log
Your unit is logged into our tracking system with a unique job number. You receive WhatsApp / email updates at every stage.
Fault Diagnosis
Board-level diagnosis using oscilloscopes, LCR meters, and thermal cameras. Root cause identified before any repair begins.
Component Repair
Faulty ICs, capacitors, MOSFETs, IGBTs, and gate drivers replaced with genuine or equivalent-spec components.
Full-Load Test
Unit tested under rated load with original or equivalent motor. All parameters verified. 6-month warranty issued.
Industries Using SANREX Equipment
We serve plant maintenance teams across all major industries where SANREX automation is deployed.
Frequently Asked Questions — SANREX Repairs
Do you repair SANREX equipment anywhere in India?+
Yes. Synchronics repairs SANREX thyristor modules, power diodes, IGBT stacks, and hybrid gate-drive circuits across the full product range. We offer PAN India door-to-door pickup and delivery from major cities including Mumbai, Delhi, Pune, Bangalore, Chennai, Hyderabad, Ahmedabad, and Kolkata. All repairs are performed in our Vadodara, Gujarat facility with ISO 9001 certification and 24-hour turn-around on routine failures.
What is the typical repair cost for a SANREX thyristor module?+
SANREX thyristor module repair costs depend on the current rating (300A to 1500A), voltage class (1200V to 4000V), and extent of damage. Gate-cathode leakage repairs start at INR 12,000-18,000. Full die replacement or multi-unit stacks can reach INR 35,000-60,000. Synchronics provides free diagnostic evaluation and a written quote within 24 hours of receipt. Emergency repair with rush charges available.
Can SANREX power stacks be repaired, or should we always buy new modules?+
SANREX power stacks (thyristor SCR/GTO and IGBT modules) can almost always be cost-effectively repaired. New modules cost INR 80,000-250,000 depending on current and voltage rating. Expert repair by Synchronics typically costs 30-50% of replacement. For plants running on tight maintenance budgets in Indian heavy industries, our SANREX repair service extends equipment life by 3-5 years, avoiding capital equipment replacement and production shutdowns.
What warranty do you provide on SANREX module repairs?+
Synchronics provides 12 months parts and labor warranty on all SANREX semiconductor repairs. We maintain stock of replacement dies, gate-drive ICs, and capacitors specifically for SANREX modules. If a repaired unit fails within warranty, we repair or replace it at no cost. Extended 24-month warranties available for critical applications in power generation and process industries at 15% surcharge.
Do you stock original SANREX spare parts, or use alternative suppliers?+
Synchronics maintains a relationship with authorized SANREX / Mitsubishi Electric distributors for authentic replacement components. We source original gate-drive hybrid ICs, electrolytic capacitors rated for 105°C operation, and thermal interface materials matching SANREX specifications. Where original parts are obsolete, we validate equivalent alternatives (e.g., Littelfuse diodes for SANREX stack upgrades). Complete bill of materials and part traceability provided with every repair.
How do I send my SANREX unit for repair?+
Pack the unit securely and courier it to our Vadodara workshop. Include a note with the fault description and your contact details. We will log it into our system and WhatsApp you a job number within 24 hours of receipt.
What is the cost of repairing a SANREX drive or PLC?+
Repair cost depends on the model and the fault. We offer a free diagnosis — once we identify the fault, we provide a fixed quotation before proceeding. Typical repairs cost 20–40% of the new unit price. We will never repair without your approval.
What warranty do you provide on SANREX repairs?+
All repaired units carry a 6-month comprehensive warranty covering the same fault and related issues. If the fault recurs within the warranty period, we repair it free of cost.
Do you provide a no-fix, no-fee guarantee?+
Yes. If we cannot repair your SANREX unit after diagnosis, you pay only the diagnosis fee (₹500–₹1,500 depending on the product). The unit is returned to you at no additional charge.
SANREX Repair Catalog
Showing 1–1 of 1 SANREX products
Other Brands We Repair in the Same Categories
Get Your Equipment
Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Service
Ship from anywhere