The switch-disconnector is largely used as the main switch in low voltage switchgears for distribution of power, starting and stopping motors and isolating loads during maintenance.
They are also enclosed in metal or plastic boxes as safety switches to ensure that accidental start of machines is prevented.
The range from 16 to 160 Amp are either base plate or door mounted by snap-on or screw fitting. Front operated 3-, 4-, 6-, 8-pole and change over types are available as standard.
From 200 up to 3150 Amp the switch-disconnectors, also called load break switches, are designed as pole modules and they are available as 1- to 4-pole versions, front or side operated
Plugs – Plugs, angled plugs, wall mounted plugs, flanged plugs, phase invertors & accessories
Connectors – Wall sockets, flanged sockets straight / sloping, CEE design socket
Switched interlocked Sockets – with fuse Extra low voltage plugs and sockets
Plugs & sockets 7 – Poles, Container – Plugs and sockets, Caravan-plugs and sockets, Midnight series 20/30A North American product offering, 16/32A international product offering
Plugs and sockets with earth contact (DIN 49440), P-Nova, P-Nova+, Taurus, Top Taurus Adaptors, CEE motor protection plug Distribution Boxes, Compact Distribution Boxes, Solid Rubber
Distribution Boxes – wall mounting or mobile, thermoplastic insulated distribution boxes – wall mounting or mobile, Distribution boxes with suspension hock
Cable reels, Lighting fixtures, hinged window, Vario Connector – variable connector block
Nowadays we use more commonly Miniature Circuit Breaker or MCB in low voltage electrical network instead of fuse.
The MCB has some advantages compared to fuse.
1. It automatically switches off the electrical circuit during abnormal condition of the network means in over load condition as well as faulty condition. The fuse does not sense but Miniature Circuit Breaker does it in more reliable way. MCB is much more sensitive to over current than fuse.
Steel wire armoured cable, commonly abbreviated as SWA, is a hard-wearing power cable designed for the supply of mains electricity. It is one of a number of armoured electrical cables – which include 11kV Cable and 33kV Cable – and is found in underground systems, power networks and cable ducting.
XLPE/SWA/PVC multicore steel wire armoured power cables are designed for fixed power and control industrial use where protection against mechanical damage is required. They have class 2 stranded plain copper conductors, XLPE (cross linked polyethylene) insulation, SWA (steel wire armour) and a black PVC (polyvinylchloride) sheath as standard. The cable is suitable for use in outdoor and underground installations.
A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
A DC motor relies on the fact that like magnet poles repel and unlike magnetic poles attract each other. A coil of wire with a current running through it generates an electromagnetic field aligned with the center of the coil. By switching the current on or off in a coil its magnetic field can be switched on or off or by switching the direction of the current in the coil the direction of the generated magnetic field can be switched 180°. A simple DC motor typically has a stationary set of magnets in the stator and an armature with a series of two or more windings of wire wrapped in insulated stack slots around iron pole pieces (called stack teeth) with the ends of the wires terminating on a commutator. The armature includes the mounting bearings that keep it in the center of the motor and the power shaft of the motor and the commutator connections. The winding in the armature continues to loop all the way around the armature and uses either single or parallel conductors (wires), and can circle several times around the stack teeth.
A light-emitting diode (LED) is a two-lead semiconductor light source. It is a pn-junction diode, which emits light when activated.When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.