Product Description


ESP Series


Base plate, PRI 230 Vac, 400 Vac, SEC 80 - 310 Vac, 0.8 - 18 A


  • Simple mounting thanks to robust metal footplate with oval slots
  • Contact protected screw connection terminals complying with UVV BGV A3
  • Very good moisture protection and low noise thanks to BLOCK IMPEX vacuum impregnation
  • Very high efficiency
  • Low weight and small size (compared to isolating transformers)



Autotransformers are the efficient and ideal solution for minor voltage adjustments. Compact designs can be provided depending on the voltage difference. Autotransformers feature lower losses compared with isolating transformers with the same power rating. The transformers without galvanic isolation also feature inverse operation. BLOCK's standard range features power outputs of between 150 VA and 250,000 VA

  • Efficient solution for minor voltage adjustments
  • Inverse operation possible
  • Power output: 250 VA to 250,000 VA


Autotransformer for example for setting the speed of single-phase fan motors.


Rated Output Current

0.8 - 18 A

Maximum Ambient Temperature

40 °C


Class B

Degree of Protection

IP 00

Rated Output Voltage

80 - 310 Vac

Rated Input Voltage

230 or 400 Vac


VDE 0570 Teil 2-13, DIN EN 61558-2-13, EN 61558-2-13, IEC 61558-2-13

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


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