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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 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...
With an RM6, can I use DIN fuses instead of FUSARC fuses?
No, only FUSARC CF or SIBA fuses are compatible with RM6 cubicles. FUSARC fuses are specified in DIN 43625.
What is the difference between a VPIS and a VDS (SM6, RM6 power ON pilot light)?
VPIS (Voltage Presence Indicator System): According to standard IEC 61958 the purpose of a VPIS is to signal a voltage presence. If a lamp is unlit,...
Should I use the adapter for phase comparator on an SM6 - 24 kV cubicle?
The 3723912 comparator can be used (PDU and VPIS) up to 7.2 kV. Between 10 and 24 kV there are two options: PDU/VPIS: use the 3730139HC adaptor in...
What is the LV cable routing for a remote-controlled 24 kV SM6 substation?
The LV cables are routed across the top of the LV compartment. An optional cable tray can be used to hold all the cables. In the case of cables leading...
What is the reference number of the orange coloured two-hand control unit?
The XY2SB**  two-hand control units, are supplied painted, orange RAL 2008. See attachments Note:  The colour of the control unit is not a requirement...
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