Product Description


SMTT Series

Isolating Transformer

Interference suppressing isolating transformer; Portable, PRI 230 Vac, SEC 230 Vac, 150 VA


  • Safe galvanic isolation
  • Carry handle, mains cable with safety plug, shockproof socket for portable application
  • High degree of protection
  • Very good moisture protection and low noise thanks to XtraDenseFill resin encapsulation
  • Integrated short-circuit and overload protection
  • Low magnetic 50 Hz leakage field
  • Good attenuation against radio frequency interference and pulses
  • Low leakage current and high insulation resistance


Isolating Transformers

Isolating transformers with galvanic isolation provide a reliable supply to circuits with the safety measures “protective separation”. The transformers provide double or reinforced isolation between the primary and secondary sides. Any requested network configuration is possible for the secondary side, whether this involves a monitored isolated system or grounded system with fuse elements. The output voltage for the isolating transformers can be between 50 Vac and 1,000 Vac or 120 Vdc and 1,415 Vdc. BLOCK's standard range includes power outputs of up to 1 MVA.

  • Double or reinforced isolation between the primary and secondary sides
  • Flexible structure for the secondary side network configuration
  • Power output: 50 Vac to 1,000 Vac or 120 Vdc to 1,415 Vdc
  • Power output: up to 1 MVA, higher power ratings upon request


Isolating transformer for mobile use to minimize mains supply faults such as disturbing pulses and electrical noise. The specified protection class is only guaranteed if a plug with at least the protection class of the device is used.


Rated Power

150 VA


Up to 90 %

Maximum Ambient Temperature

40 °C


Class A

Degree of Protection

IP 40

Rated Output Voltage

230 Vac

Rated Input Voltage

230 Vac


VDE 0570 Part 2-4, DIN EN 61558-2-4, EN 61558-2-4, IEC 61558-2-4

Specifications vary between configurations. Refer to the Configurations below for more information and links to the manufacturer's website.



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