Autoelettric - Tel: +39 0444 401001 - e-mail: info@autoelettric.com - VAT n. 01650120247 --- Copyright © 2007 |
Designed by AccaPi Studio S.r.l. |
Multitimer |
New Heavy Duty
Relays when you need
more than 80A…. |
Timer Relay |
MAIN DIFFERENCES BETWEEN CONTACTORS (100A up
to 600A) AND TRADITIONAL HEAVY DUTY RELAYS |
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Fork Lift |
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Lift of Trucks |
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Construction Vehicles |
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Boats, Yachts and other Marine Vessels |
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Electrically Powered Vehicles |
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Trucks |
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Industrial Vehicles |
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Trains |
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Military Vehicles. |
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Hybrid Duel Fuel Vehicles |
A Contactor works by closing/ making or opening/ breaking an electric circuit. The control voltage is
typically: 12V, 24V and 48V. Compared to traditional heavy duty relays, Contactors have a superior
performance, are safer and more reliable and consume less energy. |
Primary differences: |
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A Contactor works by closing/ making or opening/ breaking an electric circuit. The control voltage |
is typically: 12V, 24V and 48V. Compared to traditional heavy duty relays, Contactors have a
superior performance, are safer and more reliable and consume less energy. Primary differences: |
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Both contactors and traditional heavy-duty relays work according to the same electromagnetic |
principle. However, they are very different in design: traditional relays have a spring, connected to
a contact with a small surface and cross sectional area, linked to an armature and copper bobbin,
in this way the bobbin attracts the iron armature when a current flows. In comparison a Contactor
has a spring with a larger surface and cross sectional area and also a bigger core inside the copper
bobbin. When current flows through the bobbin, it moves and either closes or opens the contacts. |
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Contactors use a double section copper bobbin, so the closing or opening speed is much faster |
than traditional heavy-duty relays. This reduces electrical arcing and also reduces overheating of
contacts. This helps reliability by reducing the wear and tear of contacts and increases the lifespan
of the contacts considerably. When the contacts of a contactor are closed, the first section of
copper bobbin is disconnected, and only the second section is active, therefore the power
consumption is greatly reduced in comparison to traditional heavy-duty relay. |
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Contactors are less prone to interruption caused by voltage fluctuations in the supply line. When the contactor is in the energised |
state the coil requires much less current. In the event of a fluctuating supply voltage the contactor will tolerate a reduction of the
operating voltage going down to 22V for 48 V version, 13V for 24V version and 5,6V for 12V version, without interruption of closed
circuit. |
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When compared to the traditional heavy duty relay, the contactor makes contact by means of a large strong metal section |
attached to two contacts with a large surface and cross sectional area. Whereas in a heavy duty relay, the making or breaking is
concentrated on one unique point, therefore having a much smaller contact area. |
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The voltage drop of contactors is smaller than in a traditional heavy duty relay. It can be measured at less than 60mV at very high |
currents ranges. |
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Contactors can make or break the electric circuit at a very high speed. This reduces the risk of contacts welding together. In |
traditional heavy-duty relay contact welding is a primary cause of premature relay failure. |
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Contactors can support a current 3 times greater than its nominal value during making and/or breaking of the circuit. |
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Contactors can withstand voltages drops up to 1000V AC 50Hz, with no risk of failure. This is because the housing is made from a |
material that has a high insulation properties called bakelite. |
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Contactors are designed and tested to perform over 1.000.000 cycles in nominal conditions. |
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Contactors have a high resistance against humidity (up to 98%) and dust, with temperature between -25°C to +140°C |
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Contactors are designed to resist huge shocks of over 30m/s. |
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Contactors conform to the following standards: STANDARD JB2286-78 (for electric vehicles) STANDARD JB3974-85 (for vehicles |
charged by batteries). |
