Molded Case
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how can we select mccb ( molded case circuit breaker for low voltage electromotors?
i am working in a petrochemical co. and would like to know what are the principles for choosing circuit breakers for electromotors .
Hey, if u are from an IEC Country (ussually Europe), i can support. USA is governed by UL, NEMA and other standards.
But i guess the followings are valid everywhere:
1. Motor need to be protected against Shortcircuit and overload.
2. Motor protection can be made with MCCB with magnetic protection only+ separate thermal overload relay.
Or with thermo-magnetic trip units from MCCB-s. Be careful, the thermal protection must be according to the starting type of the motor: class 10 for normal start, class 20 for heavy, or class 30 for heavier start.
Difference between Tripping classes is that a bigger tripping class allows a high current for more time.
Normal start is class 10, and Motor protection “tailored” MCCB-s are on the market, cheap, and good, with magnetic protection( for shortcircuit)+thermal protection class 10. EX; Surion from GE, PKZ from moeller. There are also mccb-s with electronic trip units which allow seelection of tripping class! EX: GE’s record plus MCCB-s frame E-G , with SMR 2 trip units: u can select line protecion mode, or motor protection class 10, 20, or 30!. Of course, 5-7 times more expensive.
Here are some excellent bargains on ebay for Molded Case
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Craftsman 200 PC Mechanics Tool Set W/ Molded Carry Case 33200 $94.00 |
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Mixed 205 Piece Home Garage Use Hand Tools Set w/ 3 Drawer Molded Carrying Case $49.99 |
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Craftsman 200 pc. Mechanics Tool Set with Molded Case. $71.99 |
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12140 Handymans 50pc Mega Tool Set Molded Custom Carrying Case $22.52 |
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NEW MECHANIC’S MEGA TOOL SET WITH STURDY MOLDED CASE $79.99 |
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SK Hand Tool SKT-6016 16 pc. Punch and Chisel Set in a Molded Case $115.93 |
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NEW MECHANIC’S MEGA TOOL SET WITH STURDY MOLDED CASE $79.99 |
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FREUD 4″ JOINER MACHINE MODEL# JS 100 IN MOLDED CASE WITH ACCESSORIES–NICE!! $49.99 |
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Propane Torch Kit Complete With Molded Hard Case Weller 2500* F $19.99 |
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48-Piece Tool Set in Blow-Molded Stand-Up Case $42.19 |
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NEW MECHANIC’S MEGA TOOL SET WITH STURDY MOLDED CASE $79.99 |
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Craftsman 200 pc. Mechanics Tool Set w/ Molded Carry Case Socket Ratchet Wrench $149.50 |
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Craftsman 200 pc. Mechanics Tool Set with Molded Carry Case New In Box $149.99 |
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Maxam 30 piece Tool Set Kit Blow Molded Storage Case Standard Set Gift Boxed $26.18 |
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New Craftsman 200 pc. Mechanics Tool Set Molded Carry Case Included $129.95 |
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5pc 1/2″ Carbide ROUTER MOLDING BIT SET with WOOD CASE cut shaper mold cabinet $59.99 |
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16 PC HOLE SAW KIT WITH MOLDED CASE NEW $15.85 |
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Milwaukee 48-55-9166 Plastic Molded Carrying Case for Circular Saws VG Condition $22.50 |
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Great Neck Tools 48 Piece Tool Set in Blow Molded Stand Up Case $47.85 |
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NEW 1/2 Inch Air Impact Wrench Set.Mini Oiler.Oil Pot.Molded Case.Hex Key 4 mm. $79.99 |
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Rotary Tool 40 Pc 1.2A Master Mechanic 139783 with Molded Case NEW $19.99 |
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NEW Air Brad Nailer With Case.Molded Plastic Carry.Construction Nail Gun.Builds. $57.99 |
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New Craftsman 200 pc. Mechanics Tool Set with Molded Carry Case. $199.99 |
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Milwaukee 48-55-9166 Plastic Molded Carrying Case for Circular Saws $37.97 |
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Hard Molded CASE ONLY For Milwaukee 2602-22 2602 M18 18-Volt Drill/Driver – NEW $17.00 |
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Eclipse 900-225 Blow-Molded Case with Pre-Cut Soft Foam $33.99 |
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All Power America 0.5″ Impact Wrench with Blow Molded Case APT2007 $69.63 |
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NEW 30 Pc Allen Wrench Set- SAE/ MM + Blow Mold Storage Case – 2DayShip $12.50 |
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LKN Ryobi Hard Molded Plastic 12V Cordless Drill ~ CASE ONLY~ 10 X 13.5″ Gray $17.99 |
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**New** Craftsman 200-PC Piece Mechanics Tool Set w/Molded Carrying Case $119.79 |
And a few more great deals on Amazon:
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Z by Malouf Memory Foam Molded Contour Neck Pillow – Luxurious Washable Cover Memory foam is renown for its effective qualities of pressure reduction and support. This is a very luxurious version of Tempurpedic’s Medium Neck Pillow that retails for $99. The super soft, velour cover is removable and can be laundered. Unlike other cut memory foam pillows, this is molded and has a soft, doughy feel. The memory foam is naturally antimicrobial and dust mite resistant. It sleeps … |
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Sleep Better Iso-Cool Memory Foam Pillow Isoâ¢Cool⢠pillows and mattress toppers feature Outlast® Adaptive Comfort® material that adjusts to the body’s changing temperature. The microscopic Phase Change Material (PCM) beads sense whether the body’s mean temperature is too warm or too cool. If the body’s temperature is too warm, the product absorbs heat and feels cool in order to regulate body temperature. If the body’s tem… |
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Sleep Innovations Contour Memory Foam Pillow $31.95 Memory foam contour pillow cradles your head and neck with therapeutic support helping you sleep in a healthy position. Orthopedic design promotes proper spinal alignment which may help provide relief for sufferers of snoring, insomnia and stress. Comfort impressions memory foam conforms to body contours providing greater personalized comfort. Contour shape keeps head and neck naturally aligned an… |
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MOLDED ATA HARDSHELL CASE FOR THE … |
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Stanley 94-248 65-Piece General Homeowner’s Tool Set $47.99 You’ll have the right equipment for every job with this convenient, 65-piece hand tool set. Weighing less than 10 pounds, the black case with built-in handle includes a hammer, a wrench, pliers, and a screwdriver set. Allen wrenches and a ratchet set are also included…. |
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Husqvarna 100000107 Powerbox Carrying Case $34.95 Husqvarna Carry Case Power Box designed to hold essential accessories. Accessories are not included…. |
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Plano Molding 1363 Stow N Go Toolbox, Graphite Gray and Sandstone $21.64 Sandstone and gray. 2 deep Plano model… |
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Mack’s Pillow Soft Silicone Earplugs, Value Pack, 6 pr $3.30 The original silicone putty. No. 1 doctor recommended brand. Snore proof. Water proof. Swim, sleep, study, shower, work, travel, sports, loud events, flying discomfort, etc. Helps prevent swimmer’s ear. Noise Reduction Rating: 22 decibels (when used as directed). The range of noise reduction rating for existing hearing protectors is approximately 0 to 30 (high numbers denote greater effectiveness)… |
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Sanyo XX Battery Powered by eneloop, 2500mAh High Capacity, 4 Pack AA Ni-MH Pre-Charged With MQRO6 quick charger $39.95 MQR06 is a microprocessor controlled quick-charger and is perfectly made for the demanding user. The plug is molded to the case for direct use into an A/C wall socket. If you take off the European plug, you will be able to use the US-plug, which is placed behind it, making MQR06 very convenient for traveling. A very special feature is the individual charging, whereas each single cell gets charg… |
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Timex Ironman Triathlon Sleek TapScreen 150 Lap Watch This cutting-edge performance watch allows you to access information without breaking your stride, giving you the edge when every second counts. TapScreen Technology logs split times with one firm tap on the watch face. Glancing at the oversized display, or listening to the audible alarms then provides real-time performance feedback. Features – INDIGLO Night-Light with Night-Mode – TapScreen Tec… |
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