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Material transfer occurs as a result of I2 R heat. Mechanically held contactors and relays are generally used in locations where the slight hum, characteristic of AC magnetic devices, is objectionable. Magnetic contactors are electromagnetically operated switches that provide a safe and convenient means for connecting and interrupting branch circuits, Fgr. Because gold has a low boiling temperature, the flashing will burn off after just a few switch cycles if arc voltage and current is exceeded. Finally, the latch plunger 107 includes a main body portion 114 containing a closed loop pathway 116 for receiving a second end 127 of the latching bar 126. The power circuit is engaged once the manual controller is activated by an operator. In the late 1800's, "throwing the switch" meant that someone had to stand next to the knife blade switch and level it into the closed position. Such materials on contacts used in a dry or low-level circuit can result in the contacts failing electrically to close the circuit, even though they make physically. How To Apply A Contactor To A Lighting Application | Sprecher + Schuh. 09/716, 655 entitled "FIELD CONFIGURABLE CONTACTS AND CONTACTOR" filed Nov. 20, 2000 now U. Pat. Further received in the front 22 of the base 12 is an armature holder 50, which have a generally rectangularly shaped receiving space as shown, for receiving armature 28 therein. 1 with the electronic circuit of FIG. In some cases, it may even be desirable to have more than two-poles of contacts within a single contact module.
The change of state in mechanically held contactor is generally achieved by applying the control supply to the coil and then removing it through a set of auxiliary contacts which change state along with the change of state of the main contacts. Mechanically held relays and contactors are often used because they must. Timing the voltage pulse when starting motor loads with high starting torque. The attachment is made with either a fastener, or snap fit that allows the installer to add or remove modules on an as needed basis. Disclaimer: The content provided in this white paper is intended solely for general information purposes and is provided with the understanding that the authors and publishers are not herein engaged in rendering engineering or other professional advice or services. Two embodiments of the invention are explained as typical examples, but the use of this invention is not restricted to these two.
You also have those with a breaking current ranging from a few amperes to thousands of amperes and those from 24V DC to many kilo volts. The cover 70 further includes a cut out 90 which may have a peripheral lip 92 extending above the front surface 76. The contactor is designed to facilitate rapid ON-OFF action (close-open action).
In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. The electrical life expectancy of general purpose and power relays is generally rated to be 100, 000 operations minimum, while mechanical life expectancy may be one million, 10, or even 100 million operations. Suggested capacitor types are metalized foil and film foil. NEMA encouraged manufacturers to standardize on frame sizes to allow users to confidently specify, purchase, and install electrical components from different manufacturers without a lot of hassle and cross-referencing. Identifying mechanically held contactor versus electrically held contactor | Schneider Electric USA. The magnetic contactor does not require human intervention and operates electromechanically. Both perform the same task of switching a circuit!
The motion of the main cam 24 results in a change of state of all contacts in the contact modules. The second coil also reduces the reliability of the design and adds to the cost and weight of the contactor. This figure can represent either DC polarity or instantaneous AC. The prongs 456 may include outwardly directed hook like projections at the ends opposite the ends which connect to the cover 454. Mechanically held relays and contactors are often used because they enter. The design of such an assembly for separating and bringing together the pairs of separable contacts may be altered according to contactor needs or applications. In addition, the mechanical linkage consistently opens and closes the circuit, sparing the metal from some of the arcing experienced under knife blade switches. In some applications, the contacts may be subjected to punishing current surges which can drastically reduce their life. Contactor Building Blocks.
Both the bimetallic strip and melting solder-pot rely on thermal energy to trip their elements. Safety relays also typically incorporate redundant contacts as part of their safety measures. Consider this as position 2 for the main cam 24 and plunger of latch assembly 102. NEMA contactors are primarily used in North America however, more companies are adopting IEC contactors, c3controls specializes in IEC. It also prevents personnel from touching the contacts. Hence the contacts maintain the same actuated status when the main cam 24 is at position 1 or position 2. Any such material transfer is negated by the fact that when the contacts open and the mercury returns to the pool in the bottom of the relay, fresh mercury takes its place at the very next switch operation. To solve the above-described problem, some manufacturers provide an accessory that can be applied to a contactor to mechanically latch the contactor. Thus, the relay armature tends to release every half cycle. Current switching capacity: relays can carry loads of up to 10A or less, while contactors carry loads higher than 10A. Engineering Essentials: Relays and Contactors | Machine Design. The relay now closes and latches mechanically. 11 shows a three-phase power load application using one main contactor to disconnect the distribution panel.
DC Mechanically Interlocked - IEC. Because contactors are typically carrying high loads, they often contain additional safety features like spring-loaded contacts to help ensure the circuit is broken when de-energized. The contactor shown in FIG. Current from the external control circuit passes through the contactor, exciting the electromagnetic core. A reed relay consists of reed switches within an operating coil. BACKGROUND OF THE INVENTION. The arc that's formed when the contacts open can be lengthened and extinguished by motor action if it's in a magnetic field. Worse, if reapplied power occurs at or near zero voltage and the increasing voltage aids remanent magnetism, the core and the air gap may saturate. 5 is a sketch of a blowout magnet with a straight conductor (ab) located in the field and in series with the magnet. Also, as with motor loads, when power is removed from a transformer, the transformer will develop a counter voltage which can cause a destructive arc to exist between separating contacts. The range of sizes offered by manufacturers is more numerous than the ten NEMA standards.
You also need a reliable supplier like CHINT which offers genuine products meeting global standards like IEC. The housing 450 may include a substantially box-shaped portion 452 having an open compartment, hidden from view, for receiving the electronic circuit 150 mounted, for example, on a printed circuit board 458. The contacts of the contactors are known for their rapid open and close action. For applications where it is believed that silver tin indium oxide should be used, contact SEC applications engineering. What is the Difference between Soft Starters and Contactors? Older devices may use solder-pot heat sensing. In comparison, a soft starter is a magnetic contactor with the option of adding different overload relays. However, because of relatively poor conductivity properties, load currents are limited to about 5 amperes. However, there was a problem with this method of switching. This means that with a contactor, when it is de-energized there is (typically) no connection. Contactors can be viewed as special-purpose relays designed for repeatedly establishing and interrupting high-power circuits.
The working principle of solid-state soft starters with thyristors or silicon-controlled rectifiers (SCR) is based on these fast-acting semiconductors. The electromagnetic core in an AC contactor often has an E shape, while that of a DC contactor often has a U shape. The liquified metal tends to collect on the cathode contact because that contact is cooler than the anode contact. 6 shows a section of Fgr. The arc between the contacts creates additional heat which, in time, can damage the contact surfaces. Mercury has a boiling temperature of 357oC.
As their name implies, they are designed to control safety circuits and shut off primary power to a machine in the event of a hazardous situation. A soft starter consists of two major components, namely: - Contactor: The main function of the contactor in a soft starter is to control the flow of electric current to the connected AC induction motor. So, what features make them different? Such loss can be significant over the course of tens of thousands of operations, and the only practical way to minimize it is by arc suppression. Do you still have questions about the differences between a contactor vs relay? Home | Articles | Forum | Glossary | Books|. To begin with, AC differs from DC in that AC crosses zero 120 times per second for 60 Hertz service while DC, of course, is continuous current. Contacts: They are the current carrying component of the contactor–the entire load current flows through the contacts. Because of this, it is desirable to suppress the arc. Applications Considerations. What causes the arc to move upward in a blowout magnet? In the two pole embodiment shown, the moveable contacts 332, 334 are provided on the module plates 340, 342, respectively.
When a set of contacts switches a load of less than rated value, contact life may be significantly greater. 1-4, an assembly for separating and bringing together pairs of contacts may include a magnet, an armature, a main cam, and a cam follower within a contact module, as well as other interconnecting parts. The controller 404 then (after the pre-determined sleep period t1), provides another output pulse 412 to the coil of the contactor 10 during which the contactor 10 again changes its state and thus goes back from ON to OFF state, also reinstating the earlier status of the auxiliary contact 220. A bimetallic strip usually sits in the tube and serves as the heat-sensitive element.