Signal Transformer / Bel M4L More-4-LESS™ International Transformers

Signal Transformer / Bel M4L More-4-LESS™ International Transformers are lightweight chassis-mount transformers that support high ambient temperatures. The M4L transformers feature 4kV dielectric strength, 300VA to 1000VA power ratings, 115V output voltage, 30µA leakage current, and UL 94V-0 flame rating. These transformers provide a 12mm creepage distance between the input and output windings. Typical applications include medical beds, C-arm tables, ultrasonic atomizers, home oxygen therapy equipment, dental chairs, veterinary tables, MRI machines, cancer eradication equipment, and nurse call stations.


  • Lightweight
  • Chassis-mount
  • 12mm creepage distance between input and output windings
  • Supports high ambient temperatures
  • Minimizes energy losses
  • Touch-safe terminals (IP20 type)
  • Class F insulation system
  • Screw mounting
  • UL 94V-0 flammability rating
  • RoHS compliant


  • Medical beds
  • C-Arm tables
  • Ultrasonic atomizers
  • Home oxygen therapy equipment
  • Dental chairs
  • Veterinary tables
  • MRI machines
  • Ultrasonic sealing equipment
  • Scale and measurement equipment
  • Laboratory test equipment
  • Ultrasonic gene splicing
  • Nurse calling stations
  • Rehabilitation equipment, including ergometer
  • Gait trainer


  • 300VA, 450VA, 600VA, and 1000VA power ratings
  • 4kV dielectric strength
  • 100V, 105V, 115V, 125V, 200V, 210V, 215V, 230V, and 250V input voltages
  • 50Hz/60Hz input frequency
  • 115V output voltage
  • <30µA leakage current 

Dimensions & Schematic Diagram

Mechanical Drawing - Signal Transformer / Bel M4L More-4-LESS™ International Transformers
Published: 2018-06-29 | Updated: 2022-10-20