These relays are used on heating and air conditioning equipment to provide switching of heavier loads with a compact size relay. Electrical relays and contactors use a low level control signal to switch a much higher voltage or current supply using a numer of different. The tr transmitreceive relays in our ham radio transceivers are examples of devices that are controlled by the circuit. Working of relayshow relay works,basics,design,construction. The rated load is used as the reference load for electrical life tests. When the time delay is complete, the contacts return to their shelf state. Relays are simple switches which are operated both electrically and mechanically. Solidstate relays deliver the same result, but dont have the mechanical components. Totally enclosed nonpositional ul recognized coil voltage 60 hz. The zsr series interfaces with low voltage thermostats, or any other low voltage controllers having a switching action. Model coil voltage terminals terminals coil data number 5060 hz 123 456 dc res. These relays come in 1 through 6zone models and select exp models can be combined to cover up to 120 zones.
Sr series switching relays work with virtually any 24v thermostats and are compatible with all major circulator pump brands, including. Electrical connections to the a and k models would be made to terminals 1 and 3. Maximum switching capacity is given for a resistive load. There is a tendency to immediately blame the relay and switches for any amplifier or antenna switch problem, from high input swr to intermittent output. Some relays may well have different rated currents depending on whether ac or dc is used, this one doesnt.
The r4222k is a spst relay with normally open contacts rated for pilot duty applications. Electromechanical relays hvacr power relays the zettler controls hvacr power relays are among the most popular relays used in air conditioning today. The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. Hvacr power relays electromechanical relays zettler. Electrical relay and solid state relays for switching. There is a style of relay that has its pole arm inside a field coil. Hazardous location relays phoenix contact the industry has imposed stringent requirements on the reliability and safety of the switching components in potentially explosive areas. The design and types of relay switching circuits is huge, but many small electronic projects use transistors and mosfets as their main switching device as the transistor can provide fast dc switching onoff control of the relay coil from a variety of input sources so here is a small collection of some of the more common ways of switching relays. The dold toggle, coupling and switch relays are the first choice for all interface applications in demanding control systems. Switching relays, taco switching relays, honeywell.
Other uses include general purpose switching in appliances, fan controls, and vending machines. Cxm series microwave and rf switching systems and drivers. Switching relay the taco switching relay is the best choice for all your zoning needs, with advanced timer and boiler functions, external diagnostic lights, switchable priority and contractor friendly pc board layouts. Contact resistance this value is the combined resistance of. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. Ideally suited to the needs of automated test equipment, instrumentation and telecommunications requirements, cotos 9200 series specification tables allow you to select the appropriate relay for your particular application. This is the switching voltage that when associated with the rated current gives rise to the rated load ac1. Relays for use in hazardous locations phoenix contact. The zvr series controls up to 6 zone valves, depending on model. Ideally suited to the needs of automated test equipment, instrumentation and telecommunications requirements, cotos 9300 and 9400 series specification tables allow you to select the appropriate relay for your particular application. These are operated to open or close the load contacts in response to one. Cxm series this series is typically used for frequencies from dc to 40 gmhz.
Taco expandable switching relays whether you want to expand up to 20 zones or utilize the advanced features of the powerport cards and addon power controls, taco exp controls allow for simple integration of advanced features. The zvr series interfaces with low voltage thermostats, or any other low voltage controllers having a switching action. The maximum switching capacity of emrs substantially derates with regard to maximum voltage or current capabilities. A relay is used to control the air conditioner in your home. Basically, a relay is a device with contacts that opens and closes a switch as the result of an input signal voltage or current applied to a coil. A mercury relay mercury displacement relay, mercury contactor is a relay that uses mercury as the switching element they are used as highcurrent switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts. In addition, relay users apply derating beyond the recommendations of the manufacturer in an effort to extend the contact life of the relay. The control circuit has a small control coil while the load circuit has a switch. This section contains a selection of switching relays. Zone relay multizone valve switching relays function the zvr series is a zone valve and boiler operating control for multiple zone hydronic heating systems. General equation of phase and magnitude comparators, duality of comparators, electromagnetic relays, over current relays directional relays, distance relay impedance, reactance and mho type, differential relays. The number of switching operations comprises the total number of switching cycles. Relays are remote control electrical switches that are controlled by another. A solidstate relay ssr is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals.
Switchingrelays it appears you dont have a pdf plugin for this browser. They connect the highly sensitive logic level of the sps, a shelf system or process computer with the raw operation of the power levels of a machine. They are capable of cycling at a fast rate with little contact bounce. To indicate static switching control, use the symbols shown in this table, enclosing them in a diamond as shown. Testing and maintenance of protective gear, protection against surgesurge absorber, surgediverter. We use microwave relays, splitters, programmable attenuators and many other microwave components from the worlds most popular vendors to build standard or custom systems to your specifications. Bistable relays can be used to switch applications in a reliable and energysaving manner. When the signal s is closed, the relay contacts r change state immediately and the time delay t begins. After the time delay begins, opening or closing the signal will not reset the time delay. This represents the maximum nominal voltage that the contacts are able to switch and for the relay to meet the. Ssrs consist of a sensor which responds to an appropriate input control signal, a solidstate electronic switching device which switches power to the load circuitry, and a coupling mechanism to enable the control signal to activate this.
Relay, stub switching, 24v 9050270 eliminating the task of manually switching cables, relay devices act as onoff bus switches to connect and disconnect individual remote terminals or entire bus segments tofrom a bus network. Relays 7 operating modes with inductive loads and motors, a suppressor circuit, which can be set up parallel to the load with a free. Using tx relay at a switching voltage of 60v dc, the maximum switching current is 1a. Connect 120 volt ac power input to terminals n and h. Relay energized on current flowing through the control circuit coil pins 1 and 3 creates a small magnetic field which causes the switch to close, pins 2 and 4. Relays and switches almost never cause input swr issues or intermittent operation during transmit in an amplifier or antenna switch. Relays and transformers switching relays 90101 thru 90105 rbm type 129000 replaces rbm9 256. Reconfiguring bus components is accomplished by simply applying low voltage to the relay devices dsubminiature. Understanding relays page 6 autoshop, all rights reserved. Taco zone controls wiring guide pages switching relays single zone wiring 2 4 switching relays oil boiler wiring safety notice 5 switching relays non exp connected together with priority 6 9 switching relays. Be sure to carefully check the actual load before use. The minimum values of power, voltage and current that a contact can reliably switch.
Metering output pulse relaysmultiplexersrailway signallingdecoder relaysindustrial control systemsremote monitoringground isolationprogrammable logic controller input multiplex relaysprogrammable logic controller output relays security systems. Our class i, division 2 cid2 relays are ulcul listed for use in the americas. Switching relays are available in one to six zone models, and if additional zones are required expandable models provide the ability to expand up to 20 zones. Relays consist of an electromagnet and also a set of contacts. Closing is an operation which results in contact closure. Relay classification, principle of different types of electromagnetic relay. Static switching control static switching control is a method of switching electrical circuits without the use of contacts, primarily by solid state devices. A switching cycle comprises the single response and release of a relay.
All the relays respond to one or more electrical quantities like voltage or current such that they open or close the contacts or circuits. They retain their switched position if supply voltage fails, preventing loss of information on the current switching status. Relays are the primary protection as well as switching devices in most of the control processes or equipment regardless of whether they are electronic or electromechanical. Mechanical relays use an electromagnetic coil and a physical switch. Phoenix contact s hazardouslocation relays our slim plc relay series have the required approvals for process control equipment. Plug in any combination of cards and controls to optimize the operation of any system. R182j, r482j, r845a, r847a, r882j, ra89a, ra832a installation service and checkout fig.
Advantages of solidstate relays over electromechanical. Relays and transrormers switching relays 90109 and 90110 rbm type 129000 a lockout relay is used in some air conditioning systems to provide manual reset protection with automatic reset overloads, high or low pressure cutout controls, etc. As the name implies, the switching of the relay from a nonconducting to a conducting. We offer the broadest range of relays and contactors in the world. Incorporates all type 28000 features except operating coils which are designed for standard commercial. White paper on different types of relays the relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. For example, the r4222a is a spst switching relay with normally open power rated contacts. Distance relays, current and voltage switching, 368 effect of power swings and lose of synchronism, 181 effect of wyedelta transformer between relay and fault, 172 electronic type, 369 groundrelay connections, 360 impedance seen during faults, 167 generator protection, overvoltage, 217. Heavy duty enclosed relays single pole, double throw enclosed switching relays jard enclosed fan relays 98 single pole, normally open general purpose and heavy duty fan relays are designed to perform quietly and reliably for years of trouble free service. Technical explanation for generalpurpose relays omron. Ad series class 8 solid state relays automationdirect.
Bistable relays energyefficient and reliable switching. Zerocrossing solidstate relays also known as a synchronous solidstate relay, this is the most common type of ssr found in the market today. A relay is an electrical switch that uses an electromagnet to move the switch from the off to on position instead of a person moving the switch. It takes a relatively small amount of power to turn on a relay but the relay can control something that draws much more power.
Bistable relays allow for two stable switch positions even when. What is relay and different types of relays pdf elprocus. Relays for use in hazardous locations class i, division 2, atex, and iecex. Our line includes products from agastat, axicom, cii, hartman, kilovac, oeg, potter and brumfield, products unlimited, and schrack, as well as te. The data is given in chart form similar to figure 2. Relay design id relays are either normally open or normally closed.