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Cable Glands, Components and Enclosures

Transformer

Safe control transformers in hazardous areas
R. STAHL's control transformers provide explosion protection when control voltages are being supplied. They are suitable for control circuits, for functional and protective extra-low voltages and for electrical separation. Among their benefits are the fact that they are responsible for only a slight voltage drop when switching inductive loads, and that they limit the short-circuit current in the control circuit.

In accordance with EN 60204-1, with few exceptions, a transformer is necessary in control circuits. R. STAHL's control transformers boast a number of benefits – for example, they limit the short-circuit current in the control circuit, and are responsible for only a slight voltage drop when switching inductive loads. They are suitable for Ex Zones 1 and 2, and are generally used for control circuits, for electrical separation and for supplying protective (PELV) and safety (SELV) extra-low voltage. They must be protected on the primary side by a motor protection circuit breaker from trip class 10 or 10 A, and on the secondary side by a safety fuse or miniature circuit breaker. It goes without saying that these components are also available from R. STAHL.

  • Typical applications: Control circuits, protective extra-low voltage (PELV), safety extra-low voltage (SELV) and electrical separation
  • Line voltage can be adjusted at tapping points (primary side +/- 5%)
  • Short-circuit current limiting in the control circuit, small voltage drop when switching inductive loads

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Description​

1 Serie (1 Product)

Transformer Series STA

  • Low voltage drop in switching inductive loads
  • Flexible voltage adjustment by primary tapping (±5%)
  • Limitation of short-circuit current in control circuit
  • Typical applications: Control voltage circuits, functional extra-low voltage PELV, safety extra-low voltage SELV, protective separation (of circuits)
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