Major500, Major1000, Major2000 Steel Mill Inverters by MDS Power

Steel Mill Inverters Major MDS Power

500, 1000 & 2000VA, Sine Wave 250 VDC to 115Vac/60Hz

Major500, Major1000 and Major2000 Steel Mill Inverters from MDS Power. Rugged, DC/AC inverter systems with field proven, microprocessor controlled high frequency PWM technology to generate the required output power with pure sine wave output voltage.

The built-in fans provide sufficient airflow for operation without de-rating to the specified temperature. The high frequency conversion enables a compact construction, low weight and high efficiency.

The units have full electronic protection. The input and output are filtered for low noise.

Main features of the Steel Mill Inverters


  • 200-400Vdc input
  • Conformal coating
  • 3-pole terminal block input
  • MOV protection
  • Ruggedizing


  • Hard wired input
  • NEMA 5-15 on the front
  • Rack mount ears with handles
  • Ruggedizing
  • Conformal coating
  • ON/OFF switch on the front
  • MOV protection
  • Filter on fans


  • Hard wired input
  • Output receptacle 5-20R
  • Conformal coating
  • Ruggedizing
  • MOV protection


  • Steel Mill cranes

Model Selection Guide

MODEL Major500-250 Major1000-250 Major2000-250
Input Voltage 250Vdc nominal. 200-400Vdc operating range
Input Current 3A max 6A max 13A max
Output voltage 115VAC/60Hz
Input Connection Terminal block
Output Connection NEMA 5-15R duplex receptacle NEMA 5-15R duplex receptacle NEMA 5-20R duplex receptacle
Package Dimensions (WxHxL)  5.2”x5.2”x16” (132 x 132 x 407mm) 7.4”x 5.2” x 17” (187 x 132 x 432mm)  14” X 5.2” X 16” (355 x 132 x 406mm)
Weight  14 lbs (6.3 kg) 18 lbs (8 kg) 25 lbs (11 kg)

Steel Mill Inverters Major500, Major1000 & Major2000

Input protection  Inrush current limiting. MOV protection. Reverse polarity protection. Varistor. Internal safety fuses.
Isolation 2250Vdc Input to chassis / output to chassis 2100Vdc input to chassis/ 2250Vdc output to chassis
Output neutral is connected to the chassis
Output Wave Form Sinusoidal
Total Harmonic Distortion Less than 5% at full load
Line/Load regulation Max +6 from no load to full load
Load Crest Factor Maximum 2.5 at 90% load
Output Noise High frequency ripple is less than 500mVrms (20MHz BW)
Output Overload Protection Current limiting with short circuit protection. Thermal shutdown with automatic recovery in case of insufficient cooling
Output Overvoltage Protection By internal supply voltage limiting at 140Vac
Efficiency 90% at full load 80% at full load 78% at full load
Operating Temperature Range 0°C to +50°C
Cooling By built-in high quality fans
Environmental Protection Ruggedizing. Conformal coating
Shock/Vibration IEC 61373 Cat 1 A&B
Humidity 5 - 95% non condensing
Standards Designed to meet C22.2 No. 107.1 - 01. UL 458 and EN 60950-1
EMI EN55022 Class A with margins
RoHS Compliance Compliant
Warranty Two years

Request Information

Contact us to request Product Information, Place Orders or Ask Questions.

Sales Team


Order Support


Sales Team


Order Support


Purchase Order Fax


Search All Products