Power Isolation Transformers for Safety-Critical Applications


M4L Series of International Power Isolation Transformers are double-reinforced and offer OEMs the ability to streamline access to global markets while cutting the cost and shortening the process of obtaining new product safety agency approvals.

All M4L transformers are made of low-loss silicon and flame retardant polymers and rated to 4 KV hipot and successfully tested to 12 KV without breakdown.They range in weight form 7 to 22 lb and supplied in four sizes, ranging  from 4.20 x 4.08 x 3.75 in. to 4.89 x 5.70 x 5.25 in. The input voltage range is100 to 480 v.

They can be used in safety-critical applications such as fire alarms and security systems, emergency lighting, and deep mining exploration.


  • Made of low-loss silicon steel for and UL 94V0 flame rated polymers
  • UL Class F rated insulation system permits operation in high ambient temperatures up to 80°C
  • Non-concentric construction provides superior isolation
  • <30 µA leakage current
  • More than 12 mm of creepage distance between the primary and secondary windings
  • All M4L transformers are rated to 4 KV hipot (successfully tested to 12 KV without breakdown)
  • UL certification of the M4L Series includes safety standards UL 60601-1, UL 60950-1, UL 1097
  • Parts are offered with power ratings of 300 VA, 450 VA, 600 VA or 1000 VA
  • Input voltage range:100 V to 480 V 
  • Supplied in four sizes, ranging  from 4.20 x 4.08 x 3.75 in., to 4.89 x 5.70 x 5.25 in.
  • Weight: 7.0 to 22.0 lb
  • UL 2097
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