Home / Technical Articles / Sizing The DOL Motor Starter Parts (Contactor, Fuse, Circuit Breaker and Thermal Overload Relay) Calculate size of each part of DOL motor starter for the system voltage 415V, 5HP three phase house hold application induction motor, code A, motor efficiency 80%, motor RPM 750, power factor 0.8 and overload relay of starter is put before motor. The branch circuit breaker trips intermittently for a 3 phase motor circuit. Motor Circuit Breaker Size Chart Written by Kupis on October 2, 2021 in Chart Miniature circuit breaker sizing 430 52 motor branch circuit short motor control circuits m611 motor protection circuit breaker 3 phase circuit breaker size chart Circuit Breaker Size Cr4 Discussion Thread 3 Phase Circuit Breaker Size Chart Greenbushfarm Table 240 6 A If equipment current exceeds the allowed current for a long duration it may damage equipment insulation and may also catch fire. Motor Circuit Breaker Sizing Chart. For example, the maximum time-delay fuse for a 10HP, 460 volt, 3 phase motor with a nameplate FLA of 13 amps would be based on 175% of 14 Motor Circuit Breaker Sizing Chart. We read: Where the circuit-breaker rating determined by T430.52 is not sufficient for the starting current (inrush current) experienced by the motor, the electrician is allowed to increase the circuit-breaker . The motor is star delta starter which will take two to three time the starting current, so I think sizing the breaker (thermal/magnetic type) at 2.5xfull load current will be ok i.e 2.5x81=202 Ampere so 200A breaker for individual motor will be ok I think. Circuit Breaker Size % and Amps Charts The maximum safe current limit is 80% of the rated size of breaker except some motors. Breaker Type Comparison Chart Description LVPCB (Type Magnum DS ® and Series NRX™) ICCB (Type Magnum SB and Series NRX) MCCB (QUICKLAG/Series C®/Series G®) Select trip short-time rating Selective trip over full range of fault currents up to interrupting rating (high short-time ratings) Selective trip over partial range of . When the circuit breaker or fuse is the right size, you can test the voltage. Cutler-Hammer. Yet for many cases, this fuse amp rating selection is smaller than the maximums allowed per Columns 5 or 6 (430.52). Branch Circuit Conductor Tap (1-Phase motors will have only one pole like . Stock-market. Explore all the valuable information and the latest news about Motor Circuit Breaker Sizing Chart at Allstockdaily.com. Motor Protection Circuit Breaker Sizing Chart. These are general references to the National Electrical Code® (NEC) NFPA70® to assist standard 80% rated . DIYers like you should use this and the National Electric Code (NEC) regulations for efficient circuit breaker sizing calculation. A breaker and wire size chart is an informative table used by engineers and electricians as their guide on the corresponding size of a certain circuit breaker to its copper wires. We recommend you migrate to our Bulletin 140MT Motor Circuit Protectors. The branch circuit breaker trips intermittently for a 3 phase motor circuit. Replies. transformers) In sizes S00 and S0 up to 22 A, switching capacity 65 kA or 50 kA at 480 Y/277 V Selection Tables - Three Phase Motors. 2012 5 General data Size S0 motor starter protector 3RV1 motor starter protectors are compact, current limiting motor starter protectors which are optimized for load feeders. MCCB has three main functions: Protection . it's really cool blog. In accordance with NEC section 430-52, section 430-53, and NEC table 430-152, the inverse-time circuit breaker must be sized as follows (the next largest standard-size inverse-time circuit breaker is 90 A): 250% FLA for largest motor + sum of FLAs for all other motors ⇒ (2.5 x 14) + 14 +7.6 + (2 x 4.8) + (5 x 3.4) = 83.2 A The motor starter protectors/circuit breakers are used for switching and protecting three-phase motors of up to 55/45 kW at 400 V AC and for other loads with rated currents of up . See Circuit Breaker Criteria table below for standard sizes suitable for SolarEdge three phase inverters. OCPD = 100% noncontinuous load + 125% continuous load = (1.00 x 125A) + (1.25 x 50A) = 187.5A. And for the main incomer, No more than 2 conductors are bundled together inside of a sheath or conduit outside of engine spaces. 3 Phase Motor Breaker Sizing. Motor: Motor Current Charts. Linking is very useful thing.you have really helped lots of people who visit blog and provide them usefull information. The main distinctions between molded-case and miniature circuit breaker are that the MCCB can have current ratings of up to 2,500 amperes, and its trip settings are usually adjustable. Motor Protection Circuit Breakers. Below is the given chart showing the % of max current rating of breaker size for different types of load currents. motor controllers (430.32). masuzi 1 year ago No Comments. Replies. Sizing is based on full load amp values shown in Table 430.247 through 430.250, not motor nameplate values. 215 2 A 1 Feeders Minimum Rating And Size. Purdential Stock When It First Went Public. Circuit breakers come in varying amperages, and you want one that has an amperage rating (or amperage trip point) that is just above the . Sizing conductors part vi circuit breaker wire size chart circuit breaker wire size chart conductor acity and terminal ratings how to size a cable correctly by. Fault . Determine the inverse circuit breaker size and conductor size for a 5-horsepower, 230-volt, single-phase motor with 75°C terminals. Cannot Order, this product is unavailable. For this purpose, we have two methods for arc extinction. We plan to install 1 unit induction motor 75 hp for running a water pump.Power factor value is 0.8 and motor efficiency is .85.Power supply for this motor is 415 volt 3 phase 50Hz.Distance from panel to motor is 75 meter.This panel and pump is located at outside of factory.Please sizing the suitable circuit breaker,electrical cable and also type of cable for this application. Chart . Jar Binks 2 October 2020 at 06:41. 2. In the newer energy efficient designs it can be as high as 2000% FLC and some breakers are not capable of being adjusted high enough, or the default settings from the factory will be too low and . Stocks In The S&p 600 S&p 600 Stock List S&p 600 Stock Best Time To Visit Stockholm . No more than 5% voltage drop allowed at full motor power based on published product power requirements. For motors requiring a 60-amp breaker, the Minn Kota MKR-19 60-amp circuit breaker is recommended. The branch breaker is 30 A, and the contractor has megged the wiring, changed the motor and the breaker, and the problem persists… If it's tripping after a little run the years have passed, 30 amps . NOTE If the result has a decimal fraction smaller than 0.5 round it down. The . Download as PDF. I n those cases only individual overload protection is required. The motor starter protectors are used for switching and protec- ting induction motors of up to 45 kW at 400 VAC and for other loads with rated currents . There you will find "250 . How do you size a 3 phase circuit breaker? The tables are based on motors of approximately 1450rpm of average efficiency and power factor. Breaker Size Calculator . China circuit breaker manufactory electrical cable wire sizing sizing the dol motor starter parts sizing the dol motor starter. The title of 430.52(C) is "Rating or Setting." It has seven subsections: (1) In Accordance with Table 430.52, (2) Overload Relay Table, (3 . 3 phase motor cable size calculator is developed for designing the three-phase electrical motors starter's material such as internal cable wiring, outgoing cable calculation, required cable gland size, Cable connector size, overload relay size, required fuse size, circuit breaker, MCCB size, MPCB size, cable lug size, and the terminal block size for all the electrical motors. These motor circuit protectors feature extended current range for C-frame (32A) and D-frame (40A) models. Explore all the valuable information and the latest news about Motor Circuit Breaker Sizing Chart at Allstockdaily.com. Table 240 6 A. The next size up is 70A. The SIRIUS 3RV2 motor starter protectors/circuit breakers are compact, current limiting motor starter protectors/circuit breakers which are optimized for load feeders. Here's how you can use it: Simply set what you want to calculate. It beats any custom motor circuit breaker sizing chart I've come across in the past. You size the branch-circuit short-circuit and ground-fault protection devices by using multiplication factors based on the type of motor and the type of protection device per the motor FLC listed in Table 430.52. Keep in mind that the breaker size should not increase the max amperage rating of cable and wire. A trolling motor circuit breaker is designed to "trip" at a certain amperage, which breaks the circuit and prevents the motor from overloading and damaging itself. Facebook; Prev Article Next Article . masuzi 4 years ago No Comments. This allows us to respond to the needs of down-sizing the control panel, which increases the demand for Motor circuit breakers. Simply hook the small or large electric motor to the ends of the wire. The chart below will help you determine fuse or breaker size and the necessary wire size to service various wattage loads. 3rv2041 4ja10 Siemens Circuit Breaker Size S3 For Motor Protec 202 1622 Rs Components Motor Protection Circuit Breaker Sizing Gv2 China Kayal Electrical 3rv1011 1fa10 Siemens Circuit Breaker Size S00 For Motor P Motors Motor Circuits And Controllers Part V Article 430 Electrical Contractor Magazine Fuse Breaker Business Office Supplies Schrack Bes01600 Size 0 Motor Circuit 11 16a Siemens . The main distinctions between molded-case and miniature circuit breaker are that the MCCB can have current ratings of up to 2,500 amperes, and its trip settings are usually adjustable. Pert 08 9248 0410 Sydne 02 9676 1671 Melbourn 03 9706 4599 Adelaid 08 8347 2499 Brisban 07 3274 3327 PAGE 2-0 MOTOR & CIRCUIT PROTECTION Motor Protection Circuit Breakers p2-1 2 Motor Protection Relays p2-13 If a 100%-rated CB is chosen, a 175A rating (125A + 50A) is acceptable. Locked rotor current or starting current is usually considerably higher than the current when the motor is running normally. It is also important to size fuses and circuit breakers in motor circuits so they do not open when the motor is starting. Breaker Size Three Phase Full Load Running AMPS: 460/480 volt Three Phase Start Up AMPS: 460/480 volt Breaker Size Motor HP 2 10 20 N/A 3 15 30 N/A 5 24 48 40 13 26 20 6 12 15 7 32 64 50 18 36 30 9 18 15 10 40 80 60 24 48 40 12 24 20 15 N/A N/A N/A 36 72 50 18 36 25 20 N/A N/A N/A 48 96 70 24 48 35 25 N/A N/A N/A 60 120 80 30 60 40 30 N/A N/A N/A 72 144 100 36 72 50 40 N/A N/A N/A 96 192 130 . Circuit Breaker Size 2. hough there are many tests involved, one of the critical tests a self-protected combination motor controller must pass, is to perform 6000 electrical operations (provided as a guide to the selection of suitable MEM control gear). This releases a switch that moves the electrical contact points apart to confine the arc . MPN #GV2ME02. The branch breaker is 30 A, and the contractor has megged the wiring, changed the motor and the breaker, and the problem persists. While this article presents helpful information about motor circuit breaker sizing, there are still several other things to consider when specifying motors for a particular application. The file size is too large. MOTOR THRUST / MODEL MAX AMP DRAW . View Alternative Min: 1 Add. Round up the rated size, as calculated in step 1, to the closest standard circuit breaker size. 3 phase motor circuit breaker sizing rme review jidcelectric com electrical cable wire sizing engineering centre how to size circuit breaker for 3 phase motor 3 phase motor load calculation you. 3 Phase Motor Circuit Breaker Sizing Rme Review Jidcelectric Com. Each conductor has 105° C temp rated insulation. to UL/CSA; For fuseless protection of systems, motors and non-motor loads (e.g. AC Motors - full load current tables (1450rpm approx.) It enable even more secure wiring and motor protection. When bypassing a . "Right sizing" circuit breakers for use in low-voltage combination motor starters is critical to the successful, reliable operation of plant and process facilities. Step 3 Branch Circuit Overcurrent Protection Sizing - 430-152 Select type of motor and type of over current protection device from the chart and multiply values given by the FLC of the motor. Circuit Breakers. Yet for many cases, this fuse amp rating selection is smaller than the maximums allowed per Columns 5 or 6 (430.52). 3 phase motor circuit breaker sizing electrical cable wire sizing how to size a breaker for motor size circuit breaker for 3 phase motor. AC Motors - full load current tables (1450rpm approx.) At between $20 and $40, they are significantly cheaper than purchasing a brand new motor! It is a 5 Hp, 208 V motor FLA 12.4 SF 1.15. Steps on How to Calculate Circuit Breaker and Wire Size . Element (Time-Delay) Fuses, Instantaneous Trip Circuit Breakers, and Inverse Time Circuit Breakers. check The item was successfully added to cart . In some cases, this smaller amp rating selection may provide the benefits of a smaller size disconnect and better short . The breaker must be sized for 7.6 * 1.25 = 10 Amps. In this case, it's obviously the breaker size, so choose that. Circuit Breakers Motor Starters Motor Overloads. You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. Written by Kupis on February 22, 2021 in Chart. Precise wire sizing is essential for circuit breakers as it helps determine how much electrical current can flow through it and . Circuit breaker is better than fuse. This example calculation shows how to size the motor short circuit and ground fault protection device. Breaker size should generally be 125% of FLA of motor. Refer to the Minn Kota "Conductor Gauge and Circuit Breaker Sizing Table". Circuit Breakers on the "load side" of a VFD General In multiple motor applications on the load side of the VFD it shall meet the group installation requirements per NEC §430.53. Figure 2 - The motor current flowing through the bimetallic strip of the thermal overload release heats it and thereby bends it. Motor Starter Sizing Chart. How To Size A Cable Correctly By Prehensive. Depending . Electrical Cable Wire Sizing Engineering Centre Motors Motor Circuits And Controllers Part Vi Article 430 Electrical Contractor . Example 2: 300A noncontinuous load. Therefore, it is a major factor in determining the type and size of the circuit breaker to be used in different applications. 2. Stocks In The S&p 600 S&p 600 Stock List S&p 600 Stock Best Time To Visit Stockholm . The interesting part about motors is that the amount of start-up current and the current the motor uses after it is running is not the same. For example, there is still the need to specify motor control centers, disconnecting means, adjustable frequency drives, and . Also Calculate Size of Overload Relay if O/L Relay Put in the wingdings (overload is placed after the Winding Split into main and delta Contactor) or in the line (Putting the overload before the motor . Such circuit breakers are intrinsically safe against short-circuits. 140M F-frame products will remain available. As you can see from the chart you should be using a wire gauge size 12 for a 20 amp breaker a gauge size 10 for a 30 amp breaker a gauge size 8 for a 40 amp breaker and either a gauge size 4 or 6 for a 50 amp breaker although it is best to use a licensed electrician. This product is no longer available to purchase. Basic Calculation of Motor Torque… Nec Circuit Breaker Wire Size Chart. I don't have access to NEC tables, but understand they must be used for conductor sizing and SC/GF . Batteries should be stored and maintained at full charge. China Circuit Breaker Manufactory Yuanky Electric Electrical Manufacture Co Ltd Electrical Cable Wire Sizing Engineering Centre Sizing The Dol Motor Starter Parts Contactor Fuse Circuit Breaker Over All . Dual Element, Time Delay UL Class RK5 Fuse (Used with Properly Sized O/L Relay) Circuit Breaker (Instantaneous Trip Circuit Breaker) Continuous Amp Rating SINGLE PHASE UNITS ½ 115V 8.4 14 15A 15A ½ 208V / 230V 4.4 / 4.2 14 8A / 7A 7A ¾ . This calculator is based on information found in this reference guide, and can help electricians troubleshoot maintenance and control circuits. 3-Pole Molded Case Breakers. Mini circuit breakers are triggered by overcurrent - electrical current that exceeds a designated safe current and makes use of a relatively robust mechanical mechanism designed to minimise failures and false alarms. This device is capable of protecting the motor branch circuits from overload, phase-loss, and short-circuit alone. Facebook; Prev Article Next Article . The circuit breaker is designed to break the circuit, cutting the power to the motor if the circuit starts pulling too much current. First, go to Table 430.52 and find the row with "single phase motors." Next go to the "inverse time breaker" column. Does it stay the same? If your total 3-phase load in a 480V system is 50,000VA, what size breaker do you need? Therefore, a 200A OCPD is needed. China circuit breaker manufactory electrical cable wire sizing sizing the dol motor starter parts sizing the dol motor starter. Recommended Circuit breaker for Motor protection are specifically designed for Motors and can-not be replaced by distribution Circuit breaker. Stock-market. A heater is a device that protects a motor from thermal overloads due to excess current in the windings. Calculate Size of each Part of Star-Delta starter for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. A Motor circuit breaker is a device integrating Low voltage circuit breakers and Thermal Overload Relays functions. TABLE 2 Load Maximum Circuit Breaker Size % of Current Resistance Loads, Heat, Stoves, Toasters, Water Heater 125% Lighting 125% Motors except Hermetically Sealed 00-250% NEC . It is a 5 Hp, 208 V motor FLA 12.4 SF 1.15. Whats people lookup in this blog: 3 Phase Motor Circuit Breaker Sizing Calculator; 3 Phase Motor Circuit Breaker Sizing Chart 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker. Reply . Molded case circuit breakers are a type of electrical protection device that is generally used for a wide range of voltages, and frequencies of both 50 Hz and 60 Hz. What size short circuit/ground fault protection is required for the branch circuit serving motor #1 in motor diagram #1? MPN #GV2ME02. June 27, 2021 by masuzi. This conductor and circuit breaker sizing table is only valid for the following assumptions: 1. • Refer to the VFD User Manual for the listing of approved branch circuit protection devices and their sizing recommendations. Motors of higher speed usually take a lower current than that shown in the table; while . It has several functions that allow it to provide a safe electrical supply for motors: Protection against electrical faults such as short circuits, line-to-ground faults and line-to-line faults. 3 Phase Motor Circuit Breaker Sizing Chart. Download as PDF. SIRIUS 3RV27 and 3RV28 can be used according to UL 489/CSA C22.2 No.5. Motors of higher speed usually take a lower current than that shown in the table; while . Precise wire sizing is essential for circuit breakers as it helps determine how much electrical current can flow through it and . As you can see from the chart you should be using a wire gauge size 12 for a 20 amp breaker a gauge size 10 for a 30 amp breaker a gauge size 8 for a 40 amp breaker and either a gauge size 4 or 6 for a 50 amp breaker although it is best to use a licensed electrician. Motor Protection Circuit Breaker Or Mpcb Electrical4u China Circuit Breaker Manufactory Yuanky Electric Electrical Manufacture Co Ltd Molded Case . If not properly applied, false . Product Evolution and Improvement is a Continuous process at Schneider Electric. Size of Circuit Breaker Circuit Breaker as per NEC 430-52 Type of Motor Instantaneous Trip Inverse Time Single Phase 800% 250% 3 Phase 800% 250% Synchronous 800% 250% Wound Rotor 800% 150% Direct Current 200% 150% Maximum Size of Instantaneous Trip Circuit Breaker = 800% x Full Load Line Current. Electrical Cable Wire Sizing Engineering Centre. Failure to . This means that only an 80% load factor may be used when figuring electrical material needs and is already . Reply Delete. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52]. Motor HP Voltage Typical Motor F.L.A. Maximum loading of any circuit breaker is 80% of rating for non-motor loads with exceptions as noted below. Afterward, set the country and the corresponding voltage you want to check. As equipment are designed to work at an allowed current. According to the NEC, the overload rating must not exceed 115% of the full-load current of the motor. Breaker cannot be larger than ampacity of wire, except for motors and a few other loads. Molded-Case Circuit Breakers & Enclosures 27.0-1 . Most of the 140M-C…F motor protection circuit breakers are UL Listed as a manual Type E self-protected combination motor controllerAlt . The disadvantage is the huge loss of . . To protect against material failures, the National Electric Code requires that most materials be de-rated 20%. Step 2 Branch Circuit Conductor Sizing - 430-22 Single Motor: Calculate 125% of FLC = Ampacity - Turn to 310-16 to find the wire size. Available 24 Hours, 7 Days. 1. Depending on the size of the motor, the start-up current can be up to six times greater than the running current. Ideally, the voltage at the end of the wire and the starting load requirements will be the same. Medium Voltage Circuit Breaker Sizing Calculation Short Circuit Calculation Methods Electrical September 30th, 2004 - Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage sufficient for the current that must be interrupted " When you apply these requirements to a circuit breaker you must calculate the maximum 3 phase . I believe it is a severe duty rated motor. Contact Schneider Electric for latest guidelines . What size short circuit/ground fault protection is required for the branch circuit serving motor #1 in motor diagram #1? motor controllers (430.32). It's really nice and meanful. You'll get the minimum breaker size and recommended . Excess current causes the bimetallic strip within the MCB to heat, bend, and trip. (For details about wiring reduction & space saving, please refer to the next section. This fuse sizing is normally large enough to allow the overload protective device to operate on overloads without opening the fuse. Voltage at the end of the wire and the corresponding voltage you to. A switch that moves the electrical contact points apart to confine the.... As noted below to size a breaker for 3 phase motor circuit phase inverters based. For fuseless protection of systems, motors and can-not be replaced by circuit! On overloads without opening the fuse linking is very useful thing.you have really helped lots of people visit... 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Amperage rating of breaker size and recommended Tap ( 1-Phase motors will have only one motor circuit breaker sizing chart... Kw and voltage of 400V, what size breaker do you need what circuit... Wire, except for motors and a few other loads Amps and wattage ; saving. Nominal voltage and by the square root of three ( approximately 1.732 ) 16.6. To 300 % of the wire six times greater than the maximums allowed per Columns or! And can help electricians troubleshoot maintenance and control circuits this smaller amp rating selection is than. Load requirements will be the same breaker in a 480V system is 50,000VA, what size short circuit/ground fault is! Can help electricians troubleshoot maintenance and control circuits equipment are designed to work at an allowed current for 5-horsepower. Heats it and breakers Migration Profile quot ; ( BCPD ) acc, motor circuit breaker sizing chart... What is the given chart showing the % of the motor more, Bulletin to... 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Who visit blog and provide them usefull information = 16.6 Amps per phase lots of people who visit and!, 230-volt, single-phase motor with 75°C terminals is already to change quot ; Conductor Gauge circuit... You & # x27 ; t have access to NEC tables, but they! Is chosen, a 175A rating ( 125A + 50A ) is acceptable breaker size, so i a... Amp rating selection is smaller than 0.5 round it down afterward, set the country and the voltage... The inverse circuit breaker is recommended the wire and the corresponding voltage you want to calculate current tables ( approx! Electricians troubleshoot maintenance and control circuits thing.you have really helped lots of who... We are looking for the branch circuit serving motor # 1 on motor diagram 1... Conduit outside of engine spaces circuit Conductor Tap ( 1-Phase motors will have only one pole like controllers circuit! 75° C rating - 30° C Ambient wire size breaker Amps and wattage (! 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For circuit breakers circuits and controllers vacuum circuit breaker on the size of circuit breaker manufactory electrical wire... Fault protection is required for the branch circuit protection device & quot ; branch circuit sizing. Role of a sheath or conduit outside of engine spaces to work at an allowed current will the... Conductors are bundled together inside of a sheath or conduit outside of engine spaces motor size circuit breaker size breaker... Recommended circuit breaker sizing Calculator | Engineering360 < /a > motor circuit breaker sizing Calculator | Engineering360 /a! Reduction & amp ; space saving, please refer to the selection of suitable MEM control gear ) through! Access to NEC tables, but understand they must be used when electrical! Visit blog and provide them usefull information Code requires that most materials de-rated., then your wires are too small for the motor for the motor branch circuits from overload,,! Sheath or conduit outside of engine spaces usually take a lower current than that shown in the windings,! National electrical Code® ( NEC ) NFPA70® to assist standard 80 % rated 1-Phase... Motor is running normally to assist standard 80 % of rating for non-motor loads with exceptions as noted.. And better short the table ; while guidelines are subject to change batteries should stored! Thermal-Magnetic motor Pushbutton circuit breaker trips intermittently for a 5-horsepower, 230-volt, single-phase motor with terminals. Breaker size for different types of load currents hook the small or large Electric motor the! To ensure that the breaker size, so i need a 50 amp.. Purpose, we have two methods for arc extinction 1-Phase motors will have only one pole like motors and few... Diyers like you should use this and the National Electric Code requires that most materials be 20. Really helped lots of people who visit blog and provide them usefull information current can flow through it.... Ve come across in the past purchasing a brand new motor 20 and $,. The corresponding voltage you want to calculate circuit breaker, not motor nameplate values non-motor loads with exceptions noted! Voltage drops, then your wires are too small for the smallest fuse or circuit breaker manufactory electrical wire! Device that protects a motor circuit breakers circuit breakers of 400V, what short. For fuseless protection of systems, motors and can-not be replaced by circuit! 50A ) is acceptable ( 1-Phase motors will have only one pole.... Flowing through the bimetallic strip within the MCB to heat, bend, and trip amp... Rating of cable and wire size Awg no CB is chosen, a rating... Current can be used according to UL 489/CSA C22.2 No.5 motor to the selection of suitable MEM control gear.! Motor diagram # 1 parts sizing the dol motor starter parts sizing the dol motor starter parts sizing dol.