How to size a contactor for a resistive load. Get the exact ampere rating relative to the type of circuit breaker you’re using. It can be implemented by the following steps: Select the AC contactor type. If it is impedance load line for the load must be calculated and then plotted on the transformer regulation curves. A Relay is similar to an auxiliary contactor, which is generally used in control circuits. 10. appropriate ammeter (and a fuse). For example, if my contactor is rated for 30A inductive, and 45A resistive, and I have a machine that has 25A of inductive loads but also another 15A of resistive loads so that the overall FLA is 40A, would I be safe using the 30A inductive/45A resistive contactor? Or, would I need to to make sure that the contactor is at least 40A inductive-rated? If you want to switch a resistive heating circuit you should select it according to the AC-1 utilization category. #1. The most common example of a resistive load is a simple heater. Making/Breaking Capacity of Contactor = 8×6 = 52 2) CONSIDER this factor when we sizing the magnetic contactor:-. Energize the system and bring all loads on line. 6 V 15 mA ZC 120-240 25 A 35 A 650 A 1. Contactors are most commonly used for controlling electric motors. There is probably some math equation out there, but you shouldn't need it since they are already rated for you. Material for making contacts must have a high welding resistance and stable arc resistance. Therefore, a 200A OCPD is needed. 3) Decide the power supply for the coil of magnetic For example, if my contactor is rated for 30A inductive, and 45A resistive, and I have a machine that has 25A of inductive loads but also another 15A of resistive loads so that the overall FLA is 40A, would I be safe using the 30A inductive/45A resistive contactor? Or, would I need to to make sure that the contactor is at least 40A inductive-rated? Sizing a contactor will depend to a large extent on the requirements of your application, and you'll have to take into account whether it's for a resistive or inductive load. Depending on the type of the contactor, the coil can also work with AC voltage. I think my predecessor put a 120v coil contactor in to make it work. Also there is a different rating for inductive loads and resistive loads. Benshaw RediStart Contactors provide control for single-phase and three-phase motors and for switching resistive or inductive loads up to 690 VAC. 5 kW. Your contactor is 20amp per pole so it is sufficient for a resistive load a 3kw element per pole, the problem is likely to be poor termination, this is a high current load, have the cable ends been suitable dressed with rated crimps or lugs? What is the brand of contactor - is it a recognised reliable brand or cheap import. Using IEC standards, however, you can size contactors very close to their ultimate capabilities. 1 0. Identify the wires, if needed, with the clear tape and pen. Let’ say the load if a motor or a Solenoid, the release time Now watch what happens when we (1) size the conductor for termination purposes at 125 percent of the continuous portion of the load, and (2) use the 75°C column for the analysis. Step 1. However if the load is capacitive or inductive it can be very agressive. Auxiliary contact modules snap onto either side for fast expansion. Sizes 1–8 are 24/60 only. It has double-break contacts to help improve safety. amps, locked rotor amps, noninductive amps (resisitive load), number of power poles, duty cycle, and the total number of expected operations. These wires should be rated in the manufacturer information. 9) The total pullout current is 67. Contactors and relays will say right on them what they are rated for. Voltage is then rectified to DC for the contactor coil. The size of a relay is comparatively small. The manufacturer supplied a Nema 4, 200 A contactor with a 200A CB instead of the 90 A CB spec'd. The enclosure is a frame housing the contact and the electromagnet. Making/Breaking Capacity of Contactor= Value above Chart x Full Load Current (Line). Choosing the right contactor for a motor is an important task. 25 0. The load element resistor assemblies, load contactors, and the cooling fans/blowers are Mounted within the structure. However, the load impedance has to be lower than the RC circuit impedance when utilizing the relay for supplying the AC voltage. Maximum Size of Time Delay Fuse = 300%x6 = 19 Amp. 75% x Full Load Line Current. Horse Power (hp) Full Load Ampere ( FLA ) * Refer to the motor data plate information. SIRIUS 3RT. These ratings are supplied by the manufacturer of the load. (1) This rating is for the size 6 contactor coil only. It finally chattered enough to burn a pad on one of the contactors which single phased the compressor and smoked it. I require a contactor for this heating load (ie size 1, 2, 3 etc). When selecting a 100-C contactor for resistive loads, be sure to refer to the column labelled AC 1 amps (page 6). Contactor, LC1 3-Pole, Resistive Load, 225 A, 110 kW, TeSys F Series. For example, the contactor’s coil may work with a 24, 120, or 220-volt AC power. 8 0. 3TC contactors for switching DC voltage, 1-pole and 2-pole. Example: Sizing of contactor and overload relay for DOL starter. With these values in mind, we’ll arrive at the following equation: I = (25 x 746) / (√3 x 220 x 0. The Nema 3 spec provided 100A service which would suffice for 125%, but not the 250%. List four types of contactor load utilization categories. 75 1. MUA has more inductive load than resistance load. The contactor will have to be able to witstand this current. 5KW(10HP), Three-phase squirrel cage induction motor, 415 volts, 50Hz, 1450rpm, the efficiency of the motor: 90%, pf: 0. Main Contacts (Poles) – the current carrying part of the contactor. The product offering starts with Mini-Contactors in a compact 12 amp frame size, followed by Midi-Contactors in up to 100 amp frame sizes, and topped off with the Power-Contactors which offer up to 800 amp frame sizes. As for CEC requirements for contactor spacing that is a good question. DC-21A and DC-21B: Switch resistive loads and moderate overloads. Current and power. Adhere the tape to the corresponding wires. Remove all power to the wires. impedance load line for the load must be calculated and then plotted on the transformer regulation curves. FLA is the amount of current the motor draws at full speed, under full mechanical load, at rated voltage. For example, you could use a NEMA Size 5 contactor to run a 50-hp motor operating at 230V or a 200-hp motor at 460V. System charging current will be indicated by the ammeter. A basic contactor is a special purpose relay that is used to control large electrical currents. They are ideal for resistive heating, for motors and compressors in air conditioning and refrigeration, as well as for food service equipment. Now watch what happens when we (1) size the conductor for termination purposes at 125 percent of the continuous portion of the load, and (2) use the 75°C column for the analysis. Wide current range (from 20 A up to 75 A up to 600 V AC) Flexible sizes: compact 1 and 2 pole contactors and full size 2, 3, and 4-pole devices Radiator Mounted Load Banks. DC-20A and DC-20B: Connect and disconnect power under no-load conditions. The resistive load banks can vary in Route the wires. NEMA size General Purpose contactors and comparable, DP contactors are shown in Table 1. Example 2: 300A noncontinuous load. The following are examples of sizing rules. Once you’ve found the equivalent locked-rotor current, you can convert it to its equivalent horsepower rating using Table 430-151 of the NEC code. AC-1: Non-inductive or slightly inductive and resistive heating type of loads; AC-2: Starting of slip ring induction motor; AC-3: Starting and switching off Squirrel-cage motors during the running time Type of Contactor = AC7b; Size of Main Contactor = 100%X Full Load Current (Line). The relays and the different contactors perform the basic operation which is called the switching. Quick connect terminals and binder head screws allow for easy wiring. Contactors, Class 8910 Types DP and DPA. Generally, these electrical devices feature multiple contacts. Mini contactors are ideal for general-duty applications where small size and cost are key concerns. Use a two pole contactor for single phase (two-wire) power and a three pole contactor for balanced Delta or Wye three phase loads. Contactors can be classified as -power contactors and auxiliary contactors. The most common kind of resistive load banks have wire resistances adjoined with cooling fans, and they are portable and easy to operate from generator to generator. 5 0. There is a huge difference between AC and DC current ratings. Definite purpose contactors are ideal for heating, air conditioning, refrigeration, data processing, and food service equipment. I have the old contactor and it reads about 150 ohms and the replacement is about 350 ohms. This reduces the minimum size of generator required for a more cost-effective solution*. The resistive rating is higher in Depending on the type of the contactor, the coil can also work with AC voltage. 3-phase versions. 1 (1) This rating is for the size 6 contactor coil only. The point where the load's power factor curve intersects the impedance load line is needed to determine if the percent rated secondary voltage of the particular transformer is acceptable. 85, KVA code: H. This calculation assumes the termination is rated for 75°C instead of the default value of 60°C: Step 1: 1. 3 NEMA Sizes 00 and 0 only. Lamp loads fall into several categories: tungsten, fluorescent, electronic IEC Magnetic Contactor: 32 A Full Load Amps-Inductive, 50 A Full Load Amps-Resistive Item # 13Y589; Mfr. Size of Circuit Breaker Circuit Breaker as per NEC 430-52 Type of Motor Instantaneous Trip Inverse Time The range of contactors is rated accordingly, starting at AC-1 for the simplest heater and expanding in load-bearing capacity up to DC-23 for series motors, and includes such tasks as the switching of resistive and inductive motor loads and the control of solid state and electromagnetic loads. 8 with an efficiency of 90%. AC contactor shall be properly selected according to the type of load and working parameters. AC contactor is generally classified into class I, class II, class III and class IV according to the type of load, and they are respectively recorded as AC-1, AC-2, AC-3 and AC-4. 09 0. If your switching a resistive load then it is simple. This can be seen in the chart above. Use wire strippers to cut excess length off of the ends of the wire, making sure that the wires are long enough to reach the intended contact. Compact 1- and 2-pole contactors are available, as well as full-size devices with 2, 3, or 4 poles. 185 in stock NEMA Rated Four Pole Contactor (No Auxiliary Contacts) NEMA Size 3 – 85A FLA Max (120V Coil) quantity This Square D™ Magnetic Definite Purpose Contactor is an open style, 3-pole contactor. 1 The inrush current during the start of the motor is significantly higher than the motor running current. If you select a small contactor, the contacts wear and stick. If I remember correctly, It will be in this Maximum Size of Time Delay Fuse = 300% x Full Load Line Current. 2 V 1 mA PC Resistive loads exhibit no surge at turn-on. The contacts are the current carrying part of the contactor. Note that at the instant the switch opens, the capacitor is discharged and the load current is driven through the resistor, so its value must be low Load types will differ in inrush current and arching. For heater The setup and installation above can also be used for the solid-state relays with an I 2 t value of at least 6 600 A 2 s. Using the formulas shown in the paragraphs on wire sizing to determine the amp load per pole (phase). When selecting a CA 7 contactor for resistive loads, be sure to refer to the column labelled AC 1 amps (page 6). The SMM can be set to a load priority between 1-8, or be set in a lock-out only mode for loads that do not need to run in an ou tage. Sizing a contactor will depend to a large extent on the requirements of your application, and you'll have to take into account whether it's for a resistive or inductive load. If a 100%-rated CB is chosen, a 175A rating (125A + 50A) is acceptable. Model # 3RT20271AK60 Contactors are categorised based on the type of load (IEC utilisation categories – IEC 60947) and current and power rating (NEMA size). 3 contactors, 4-pole, up to 525 A. Tables for Sizing Contactors to Compressors 11-17 Introduction The contactor is one of the most important parts of any motor control circuit. There are 5 primary things to consider when determining how to size a contactor for your application: Full Load Amperage at Line Voltage The first item to consider is the load, which is measured in amperes. Remove all electrical power to the L or line side of the contactor. You'll need to determine its full load amperage (FLA) and horsepower (HP) requirements, as well as the duty cycle (whether it's single direction or reversing). The electromagnet (or “coil”) provides the driving force to close the contacts. When selecting a contactor, please make sure that the contactor’s rated current is specified for the AC-3 load type. The small dimensions provide customers with high flexibility in use for applications up to 20 A resistive loads and motor loads up to 5. AC15. 7 6 (Interposing relay) 52. 00 x 125A) + (1. The size of a contactor is larger than a relay. 1 Contactors are used to power up larger loads such as induction motors. 4 0. Coil – used to energise the contactor to switch the main contacts on and off. 37 1. 1 For contactor only orders, add B to end of catalog number if NEMA Size 00–2, 6. Making/Breaking Capacity of Contactor = Value above Chart x Full Load Current (Line). 25 x 50A) = 187. A suitable contactor should be determined according to the current or power of the load. 06 0. OCPD = 100% noncontinuous load + 125% continuous load = (1. They can be used in special modular and compact applications. These UL-Listed devices can be installed inside, outside, atop, or the exhaust ductwork of a gen-set. This type applies to both DC and AC circuits. The contactor rating resistive 30A or inductive 30A. Can use the control circuit to start and stop the MUA unit with the timer. Example 1: 50A continuous load and 125A noncontinuous load. 25 x 40 A = 50 A. 2 Only available on AN56 reversing starters. Size of Circuit Breaker Circuit Breaker as per NEC 430-52 Type of Motor Instantaneous Trip Inverse Time The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. Different parameters of a motor are first analyzed to choose the right contactor. sized system, the SMM will automatically shed the managed loads to allow the generator to recover. 3 0. 44 3. Inductive loads that use solenoids or transformers will have a higher arch when turned off/on. For starter you can use the NEMA ratings, you should be able to google that. Let us calculate the contactor and overload rating for DOL starter of the following motor: 7. The load type of the motor is considered while choosing a contactor for the motor. Auxiliary contacts – used for control and signalling circuit applications. 5A. They are a flexible and economical way to incorporate testing equipment without sacrificing essential features. Load Type : AC-1 or Inductive ( AC-3 ) *Refer IEC rating table. ASCO Power Technologies offers radiator-mount load banks with small footprints for resistive loads. Description. Voltage Heat Heat Surge Drop Leakage Sink Sink 120-240 15 A N/A 250 A 1. 5 NEMA Size 5 requires the use of CTs with 1-5A OL relay. These contacts are in most cases normally open and provide operating power to the load when the contactor coil is energized. Note: For greater ampere loads, consult factory. Making/Breaking Capacity of Contactor = 8×6 = 52 Amp. The type of load makes a big difference. The resistive elements are porcupine type, folly supported along their length. Resistive loads like heaters and motor loads have similar arching, but motor loads will have an inrush of 6x the current. Typical ratings for 3-phase motor Motor size (kW) Approx. 4860 254 65. 4 NEMA Sizes 00 and 0 only. How to size a contactor for a resistive load?? I've got a 40 kW resistive load (heating elements) powered by 480V, 3ph. 18 0. Notice the much broader selections of Definite Purpose contactors that enable them to be more closely tailored to the load. 8 1. Contacts perform the current carrying function in a contactor. The moment the contacts open, current will flow to the inductive load through the snubber. From there, look for a disconnect switch that meets the following requirements: At least 115% of the equivalent current (full-load) At least meets the equivalent HP rating. 2 V 1 mA PC appropriate ammeter (and a fuse). How do you size a contactor for a motor? Type of Contactor = AC7b. 5" Peak Voltage Max. If I remember correctly, It will be in this Contactors can be field mounted easily and are compact in size. A N 1 9 A N 0 A 5E 005 Device Type A = Starter C = Contactor Contactor Rating: Resistive loads only. 6" 5. Full load currrent Maximum Size of Time Delay Fuse = 300% x Full Load Line Current. Type of Contactor= AC7b. Duty Cycle : One direction, reversing, plugging * Refer manual instruction. Place identifier marks such as L1, L2 and L3 with the pen over the tape. In order to correctly select a contactor for your application, you will first need to consider the following points. 1 : System charging current changes when loads are switched and when the system size is changed by adding or removing lengths of cable. If a lighting contactor was designed as Nema 3, with a 60A resistive heating load the 250% max rating is 150A. This includes power contacts, auxiliary contacts, and contact springs. Similarly, a traditional starter utilizes overload relays, auxiliary lect contactors based on resistive load ratings. See Fig. Size of Main Contactor = 100%X Full Load Current (Line). The ratings of these loads are referred to as nominal current. Run all input and output wires to the contactor. Inductive loads AC3: These loads are motor loads, which have inrush currents. 6 V 15 mA 277-480 10 A 12 A 150 A 3. Caution! Most contactors have a resistive rating as well as a motor rating. 3TK1 contactors for resistive loads (AC-1), 4-pole. 6 0. Size of Main Contactor =100%x6 = 6 Amp. SIRIUS 3RT25 contactors, 4-pole, 2 NO + 2 NC. 4 Your contactor is 20amp per pole so it is sufficient for a resistive load a 3kw element per pole, the problem is likely to be poor termination, this is a high current load, have the cable ends been suitable dressed with rated crimps or lugs? What is the brand of contactor - is it a recognised reliable brand or cheap import. It is vital that compressor applications for contactors are well understood and that the contactor is correctly sized for the load. Like ideal resistors, they have the same value of resistance all the time. Two-phase control (suitable in particular for circuits without connection to the neutral conductor) and. Basic Contactor Construction. There are four basic motor control options available: Basic contactors, traditional starters, manual motor starters, or combination starters. The resistive load bank converts all energy generated by a power source into heat, thus allowing it to test the generator at 100% capacity. •Determine the thermal resistance of the proposed heat sink • Check the correct relay size with the aid of the diagram Solid-state contactors for switching motors The solid-state contactors for switching motors are intended for frequently switching on and off three-phase current operating mechanisms up to 5 HP and reversing up to 3 HP. Maximum Size of Non Time Delay Fuse = 1. The power factor of the load must also be determined. 98 amperes. 1 Charging Current Definition LC1F225 from Schneider Electric at Allied Electronics & Automation. Fig. Its resistance value and its power rating must be deduced from the worst-case conditions for both scenarios. The power contact has two types that are; stationary and movable contact. Contactor relays. The Once you’ve found the equivalent locked-rotor current, you can convert it to its equivalent horsepower rating using Table 430-151 of the NEC code. Contactors for railway applications. Product benefits. The 3-phase solid-state contactors for resistive loads up to 50 A are available with. The inrush current during the start of the motor is significantly higher than the motor running current. Compare NEMA- and IEC-rated contactors with regard to Contactors and relays will say right on them what they are rated for. Resistive loads AC1: These loads have almost unity power factor, like heaters and all thermal loads, so the contactor rated current for these loads is called “Thermal current Ith”. DC23-A and DC-23B: Switch highly inductive loads such as series motors. Making/Breaking Capacity of Contactor=8×6= 52 Amp. Total voltage drop was about 160v across the coil. Its voltage is 220V, while the power factor is 0. So FLA = 40kW / (480*sqrt (3)) = 48amps. SIRIUS 3RT26 contactors for capacitive loads (AC-6b), 3-pole. CR type Snubber. So before connecting the wires to the coil, you first need to check the coil voltage. Size of Main Contactor = 100%x6 = 6 Amp. An incorrectly sized contactor can destroy the best compressor. 2. All starters are shipped with an interposing relay as standard. This load amperage is the amount of current required to power your device at the line voltage. For lighting circuits, AC-5 category is the option. 96 — 7 (2) (2) Size 7 starters are shipped with a 250 VA control circuit transformer and an interposing relay with a 120V coil. The motor starter, motor overload relay, fuses, and customer connection terminals are mounted on separate panels. full load current @ 415 V (AC 3 amps) 0. Most of the contactors, like the one we have here, work with a 24-volt DC power. MOV not going to hurt it. 8 x 0. 277-480 Vac is ZC Unit Only. 1 Charging Current Definition Total voltage drop was about 160v across the coil. May 20, 2007. Frankendodge has a point. B Calculate Size of Contactor Member. There are different types of contacts in a contactor, and they are; auxiliary contact, power contact, and contact spring. The contactor has to make this high starting current. Use the screwdriver and pull the wires from the line-side screws. 4. DC-22A and DC-22-B: Switch mixed resistive loads, inductive loads and moderate overloads such as shunt motors. Also note for DC the number of operations on an inductive load is reduced (It's ok for once or twice a day for 8 years). Nominal Rating Max. Tags: Calculate Size of C. 55 1. A N 1 9 A N 0 A 5E 005 Device Type A = Starter C = Contactor Contactor Route the wires. Select a contac-tor with the next highest current rating. 75%6 = 11 Amp. 3. Model Supply 3. As per above Chart. DP contactors are sized by the motor full-load amps (FLA) and locked rotor amps (LRA). The power rating is also related to how frequently the switch is going to be operating. To complement the contactors, Thermal Overloads are offered for each frame size, available in several setting ranges. 12 0. Use the NEMA contactor size guide to determine the NEMA size DC contactor required for a 240-V load with a continuous current rating of 80 A. Specifying and Sizing Motor Starters.


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