Frequently Asked Questions

Air Cooled Servo Stabilizers dissipate heat through forced air fans or natural convection and are economical, compact solutions for capacities up to 45 kVA in clean indoor environments. Oil Cooled Servo Stabilizers immerse the transformer core and windings in insulating transformer oil for superior heat dissipation and are the standard for capacities of 50 kVA to 2000 kVA and above, especially in dusty, humid, or outdoor industrial environments.

Servo Voltage Stabilizers use a servo motor to mechanically adjust a variable autotransformer, offering high accuracy (±1%) and wide input voltage range but with slower correction speed (2–4 seconds per step). Static Voltage Stabilizers (SVS) use solid-state switching (SCR or IGBT) to switch transformer taps electronically, offering very fast correction (within 1 cycle) but typically coarser voltage steps (±2.5% per step). Servo stabilizers are preferred for long-term continuous operation; static stabilizers are preferred where very fast response to sudden transients is critical.

Yes. We manufacture three-phase independent (column type) servo voltage stabilizers where each phase is independently controlled by its own servo motor and autotransformer. This configuration is specifically designed for installations with unbalanced three-phase loads and provides individually regulated output voltage for each phase, regardless of load balance conditions.

Standard protections include: output over-voltage cut-off, output under-voltage cut-off, over-current and short-circuit protection, time delay relay (for compressor and motor loads), manual bypass switch, and mains-on indicator. Optional protections include: thermal overload relay, phase failure relay (three-phase), phase sequence protection (three-phase), and remote monitoring via SCADA/BMS.

Our industrial servo stabilizers are designed for 120% overload for 60 seconds and 150% overload for 10 seconds without thermal distress.

Hindustan Stabilizers manufactures servo voltage stabilizers from 1 kVA to 2000 kVA. Standard single-phase capacities: 1, 2, 3, 5, 7.5, 10, 15, 20, 25 kVA. Standard three-phase capacities: 10, 15, 20, 25, 30, 45, 50, 75, 100, 125, 150, 200, 250, 300, 400, 500, 750, 1000, 1500, 2000 kVA. Custom ratings are available on request.

Standard servo voltage stabilizers deliver output regulation accuracy of ±1% for precision-grade models and ±3% for standard industrial models. Nominal output voltage is 415V (three-phase) or 230V (single-phase) at 50 Hz. Typical input range: 180V–280V (single-phase), 300V–470V (three-phase), with wider ranges available on request.

A Constant Voltage Transformer (CVT), also called a ferroresonant transformer, uses a resonant LC tank circuit to deliver a near-constant output voltage across a wide input range (typically 80V–270V for a 230V nominal unit) without active electronics. CVTs provide inherent spike suppression and are ideal for computer systems, medical equipment, and laboratory instruments. Note: CVTs have significant no-load losses and generate heat, so they are most efficient above 50% of rated load.

Hindustan Stabilizers supplies Online Double-Conversion UPS systems for critical loads requiring zero transfer time and clean, regulated power. Capacities from 1 kVA to 200 kVA for industrial, commercial, and data center applications. We also provide UPS AMC and repair services for units of all makes and brands across Delhi NCR and major Indian cities.

Hindustan Stabilizers supplies servo voltage stabilizers, isolation transformers, power transformers, and UPS systems across all major Indian cities including: Delhi, NCR, Noida, Gurgaon, Faridabad, Ghaziabad, Greater Noida, Mumbai, Thane, Pune, Nashik, Bangalore, Chennai, Coimbatore, Hyderabad, Secunderabad, Kolkata, Ahmedabad, Surat, Baroda, Jaipur, Jodhpur, Lucknow, Kanpur, Agra, Ludhiana, Amritsar, Chandigarh, Bhopal, Indore, Nagpur, Patna, Raipur, and Kochi. Pan-India project installations undertaken.

Yes. Hindustan Stabilizers is an ISO 9001:2015 certified company. Our quality management system covers design, procurement, manufacturing, testing, inspection, packaging, installation, commissioning, and after-sales service for all power conditioning products. Established in 1995, we have over 30 years of experience and 5000+ successful installations across India.

All Hindustan Stabilizers products carry a standard manufacturer's warranty covering manufacturing defects and component failures under normal operating conditions. Post-warranty, we offer Annual Maintenance Contracts to ensure continued reliable operation. For specific warranty terms, product type, and capacity-wise conditions, please contact our sales team at +91-9971812266.