Why would you use a contactor for lighting?
Lighting Control Contactors are often used to provide central control of large lighting installations, such as an office building or retail building. To reduce power consumption in the contactor coils, latching contactors are used, which have two operating coils.
What is a lightning contactor?
Lighting contactors are relay switches that control the flow of electricity through a circuit powering the lighting in a given area. They exist remotely and control circuits with higher voltages which can be dangerous to the operator, if controlled directly.
How are lighting contactors rated?
Lighting contactors can be divided into three general categories: feeder disconnect type 2-, 3-, and 4-pole lighting contactors rated up to 2250 A to control large blocks of load, multi-pole lighting contactors with as many as 12 poles rated 20… 30 A for multi-branch circuit control, and industrial relays rated 20…
Can you use a definite purpose contactor for lighting?
Definite purpose contactors for lighting systems can be controlled either manually or automatically, and are typically used in lower demand, low-cost applications. Both single pole and multi-pole contactors for lighting systems are available.
Which is better relay or contactor?
For switching low power, when the additional safety features of a contactor are not necessary, a relay is typically the more economical choice.
What is the criteria to select the contactor?
You should select the suitable contactor according to the number of phases of the load. For example, if you want to control a 3 phase motor, you should use 3 pole contactor. If you want to disconnect the neutral, your choice should be 4 pole version.
What is the difference between a relay and a contactor?
A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V.
What does LRA mean on a contactor?
LRA (Locked Rotor Amperes): This is a locked rotor (starting) current of the motor (compressor). This is generally inductive load with power factor @ 0.5. Resistive Amperes: The current when the load is resistor. This is generally used for Electrical heating application. The power factor is @ 1.0.
What is A1 and A2 on lighting contactor?
What Do A1 and A2 Mean on a Contactor? A1 and A2 on a contactor typically refer to either end of the electromagnetic coil assembly. Most contactor manufacturers use A1 and A2 to designate the two terminals connecting electrical power to the contactor’s magnetic coil.
What is the difference between a contactor and a relay?
How is contactor size calculated?
Size of Main Contactor (Starting-Transition-Running) = 58%X Full Load Current (Line). Size of Main Contactor =58%x13 = 8 Amp. Size of Delta Contactor (Running Condition) = 58%X Full Load Current (Line). Size of Delta Contactor =58%x13 = 8 Amp.
Can I use a higher amp contactor?
You can always replacce a lower amp contactor with one of higher amperage rating as long as your coil is the same voltage as the unit is wired for. As contactors increase in size, they requife more power to energize them.
Is LRA the same as starting amps?
The locked rotor current and the starting current of a motor are one and the same. It is the starting current drawn by a motor when full nominal voltage is applied to its terminals. Here is a simple locked rotor current calculator.
What do numbers on contactor mean?
These auxiliary contacts (also called control contacts) each have an order number and a function number. The first number is used consecutively (order number) and the second number specifies the type of contact (function number).
What is a 20 amp lighting contactor?
Popular 20 amp Lighting contactor with optional auxiliary contacts, 2 pole contactor or 4 pole is available with 100,000 cycles and 12V/24V/110/220 coil voltage, used to control lighting system, suitable for home, large-scale industrial and commercial.
What is a class Le contactor?
Class LE Lighting Contactors Siemens offers a comprehensive line of lighting contactor products and a wide range of control solutions for lighting applications. Contactors can be used individually for simple control schemes or as integral components in full-featured lighting control systems.
How are contactors used in lighting control?
Contactors can be used individually for simple control schemes or as integral components in full-featured lighting control systems. Siemens contactors for lighting control provide reliable and efficient means of local or remote switching of lighting as well as non-inductive loads.
Why choose Siemens lighting contactors?
The rugged construction, heavy-duty ratings and a wide selection of control options and accessories makes the Siemens lighting contactors the right choice for your applications. These Contactors are used in applications where it is not critical that the contacts remain in the closed position during loss of control power.