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Which of the SquareD range of pressure switches are still available?
There have been many changes in the manufacturing and supply structure of Square D products since becoming part of Schneider Electric. The Square...
What are the differences between the various tripping classes of thermal overload?
There are four classes of thermal overload relay: 10A 10 20 30 These class numbers indicate the trip characteristics from cold state, and should be...
How can manual override of an automatic control system be implemented?
There are many instances where it is necessary to have automatic control of a motor and also the provision of a manual override.   A typical automatic...
What is the difference between Pressure transmitters, Universal detectors, Pressure switches and Vacuum switches?
Pressure transmitters Are part of a range of products more properly generically referred to as Pressure Transducers.  They modify or generate an electrical...
In a star-delta starter, how can I incorporate a thermal overload relay as per Type 1 or Type 2 coordination?
"Only tests carried out by accredited laboratories allow the announcement that a combination of equipment can protect the installation according to...
What is the meaning of the utilization categories AC1 and AC3 for the Tesys contactors?
The standard utilization categories defines the current making and breaking values for contactors. They depend on the following: The type of load...
What is the difference between isolated and non-isolated coaxial sockets?
A non-isolated coax socket is a standard socket.  If you wish to install a socket to connect your TV coax lead into, this is what is required.  Also,...
What is the recommended maximum spacing between fixings when installing 20mm or 25mm conduit?
Conduit is installed using saddles, spacer bar saddles or quick clip fixings.  The recommended maximum spacing between fixings is 1m.  It is advisable...
Must I use the CMD Tool software proposed by Phoenix Contact to configure the M1 PLC Interbus network?
To configure devices on the Interbus IOBUS network for M1 PLCs it is preferable to use Modsoft 2.61 or Concept 2.2 SR2. Caution: Access to the M1...
What are the equivalences for the capacitive opening retarders, part numbers LA9Z, for DC coil contactors?
"The equivalences for the capacitive opening retarders in the old LC1D and LC1F range and the new TESYS D range are as follows:   Old part number...
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