High-Efficiency 500va-1000Kva Three Phase Dry Type Control Transformer

High-Efficiency 500va-1000Kva Three Phase Dry Type Control Transformer 415V 400V 380V

The SBK Series three-phase dry-type control transformer (500VA–1kVA) delivers compact, reliable voltage conversion for industrial control, automation and machinery applications. Available with configurable primary and secondary voltages (standard: 380V / 400V / 415V) and rated for 50Hz or 60Hz systems, this transformer is designed for low-voltage networks (<1kV). Its dry, air-cooled construction eliminates oil, reduces fire risk and lowers routine maintenance — making it a safe, cost-effective choice for motor control centers, CNC systems, PLC cabinets and distribution panels.

Key features

High efficiency: Measured efficiency ≥98% at rated load, reducing energy loss and operating cost.
Robust winding: 180°C class enameled wire for low-loss performance and long service life.
Quality core: New grain-oriented silicon steel laminations for low magnetizing loss and reduced temperature rise.
Reliable insulation: DMD insulation paper and class-F insulation system for long-term thermal stability.
Dry, safe design: Air-cooled (dry type) — no oil, lower fire hazard, suitable for indoor installations.
Compact & lightweight: Space-saving footprint for easy mounting and installation.
Flexible connections: Standard D/Y or Y/Y connection options; custom connections available on request.
Protection & accessories: Compatible with thermal sensors, overcurrent and short-circuit protection devices; integrated protection modules available as an option.
Built for durability: Typical design life ~10 years with proper installation and maintenance.

Technical specifications

Parameter	Details
Model	QSG Series (500VA – 1000kVA)
Phase	Three-phase
Input (Primary) Voltage	Customizable — 380V / 400V / 415V (other primary voltages on request)
Output (Secondary) Voltage	Customizable — typical options: 380V / 400V / 415V / 220V / 110V
Capacity	500 VA – 1 000kVA
Frequency	50Hz / 60Hz
Efficiency	≥98% at rated load
Voltage regulation / accuracy	±1% (at rated conditions)
Insulation class	Class F (180°C enamelled wire)
Cooling	Dry air-cooled
Connection	D/Y, Y/Y (customizable)
Warranty	1 year (standard)
Design life	~10 years (typical)

Typical applications

Motor control systems, PLC and control cabinets, CNC machinery, industrial automation, testing equipment, power supply for auxiliary circuits in substations and switchgear.

Selection guide (how to choose the right model)

Confirm required kVA based on connected load (include starting currents for motors).
Specify primary and secondary voltages and whether you need step-up or step-down conversion.
Tell us the duty cycle (continuous, intermittent) and ambient conditions — high ambient temperature or poor ventilation may require derating.
Choose connection type (D/Y or Y/Y) and any accessories (thermal sensors, mounting frames, short-circuit protection).
For critical systems, request factory test reports (no-load loss, load loss, temperature rise) and optional third-party certifications.

FAQ

Q1: Can this transformer be used as a step-up unit?
Yes — the QSG Series can be manufactured for step-up or step-down configurations. Specify the exact primary and secondary voltages when ordering.

Q2: Why choose dry-type over oil-filled transformers?
Dry-type units eliminate oil-related fire and environmental risks, reduce maintenance (no oil checks or filtration), and are often preferred for indoor installations and near-human workspaces.

Q3: What affects dry-type transformer price?
Price factors include capacity (VA), winding material (copper vs. aluminum), core grade (premium silicon steel), custom voltages/connections, protection accessories, and certification/testing requirements.