Molded Case Circuit Breakers Design features � Design features Direct-Drive switching mechanism A vertical link mechanism is used for the switching mechanism Contact opening distance/Moving contact arm torque to reduce the torque of the moving contact arm, serve as a countermeasure against increased contact opening distance, and improve contact opening speed. Conventional MCCB Handle Latch 0 Contact opening distance Moving contact arm High-performance arc quenching chamber The combination of the simple Flat Turn contact arm, blowout magnet, and arc-quenching chamber provided a unique current-limiting effect. Moving contact 06 Flat-Turn contact Arc quenching chamber Blow-out magnet Structure of the arc-quenching chamber Blow-out magnet Arc between Moving contacts contact Blow-out gas Blow-out gas Arc driving force Comparison of arc voltages resulting from short-circuit current Trip button The MCCB can be mechanically tripped externally. Conventional MCCB 0 Time Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog Information subject to change without notice 06/3 Arc voltage Moving contact arm torque Molded Case Circuit Breakers Design features Model configuration � Model configuration Side-by-side installation Compact and lightweight Standardization of the main A pole width of 25mm was selected for These breakers are more compact and dimensions of the MCCB’s has a large distribution panel breakers and lightweight than those of the old series. effect on panel design, manufacturing economy type general-purpose Photos are a comparison of new and appearance. breakers with frame size of 100A and EA103C breakers and old EA103B. smaller. � Modular construction Therefore, extremely rational Compact and lightweight Standardized modular construction procedures can be devised for panel Breakers 30AF to 800AF machining and wiring. OLD standardized basic dimensions — panel design and cutouts are simplified for manufacturing cost savings. The number of mounting space sizes for the 30AF to 800AF S and E series 130mm models has been reduced to 5. New Breakers are available in two standard depths: 60 and 103mm, choose it from two front panel cutout height of 52mm or 92mm. 75mm The operating handle is at the center of the breaker and its panel cutout for Thin terminal block EA103B eased panel design, manufacture, and The terminal block for internal mounting are easy. Terminal height accessory is now thinner (1/2 the size 23% above the panel of models 30AF to of conventional type). Thus, the space reduced 225AF is standardized at 24mm to between breakers has been reduced to ease wiring. less than 1/3 that required by NEW Panel cutout conventional type. (EA100AF or smaller) 52, 92mm 100mm Terminal height 75mm 24mm (Up to 225AF) EA103C CP-898 Depth 60, 103mm The standardization of depths reduces the number of frame sizes from 6 to 5. Conventional series dimensions (30AF to 800AF) (mm) 257 275 130 165 96 155 60 60 103 103 60 60 75 75 90 105 140 210 EA30 SA30B EA50B SA100BA SA225BA EA225B SA400B EA400B SA600R EA600B EA50A SA50B EA60B SA100RA SA225RA SA400R SA800R EA800B EA100F SA50R EA100B SA60B SA60R -TWIN series 257 275 165 155 100 60 60 103 103 60 dimensions 90 105 140 210 75 SA30C EA30AC SA103C SA225C EA225C SA400C EA400C SA600RC EA600C SA50C EA50AC SA103RC SA225RC SA400RC SA800RC EA800C SA50RC EA50C SA60C EA60C SA60RC EA100AC EA100C Note : The figures show the dimensions of three-pole models Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog 06/4 Information subject to change without notice Molded Case Circuit Breakers Design features Terminal construction � Front mounting front connection Terminal covers Modular design — Up to 225AF 4 main types of terminals are as shown Since the live conductors are exposed E and S series ( series) Since molded cases generally have in the photos. Terminal screws are at the MCCB terminals there is the self-lifting, pan-head screw, hexagonal danger of accidental contact. comon dimensions and outlines they socket head screw and flat terminal A terminal cover can be provided can easily be installed on distribution which are tighten because bolts are where necessary. boards in uniform neat groupings, with used. For further information refer to page 06 /128. switches lined up in a row. E and S Terminals vary according to the current series up to 225AF are built on the capacity of each type of housing. All modular system. For instance the breaker terminals should be connected depth is 60mm while the panel cutout to copper crimp height of 52mm. The standardization connectors or copper bus bars. Never of the MCCBs and panel board allows connect to aluminium conductors, the speed up of assembling and wiring since overheating can be expected. of the panel and permits panel surface processing to be carried out in a shorter period of time. Short type Self-lifting terminal NA-007 Long type 06 Screw terminal (Pan-head bolt) NA-008 SA225C SA225RC SA30C SA50C EA225C Panel cutout SA50RC height 52mm SA60C SA60RC SA100C EA30AC SA100RC Screw terminal (Hexagonal socket head bolt) EA50AC EA50C EA60C Depth EA100C 60mm EA100AC F50B F100B Flat terminal SDO-0190M Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog Information subject to change without notice 06/5 Molded Case Circuit Breakers Design features Accessories � Internal and external accessories Two ways to connect — lead wires or • Terminal block types A wider range of customer-mountable terminal blocks Terminal blocks are mounted on the side • Lead wire types accessories of the breaker case. Blocks are only The range of cassette-type internal Leads are marked with to indicate the 12.5 or 19mm thick, minimizing panel accessories has been greatly expanded correct terminal number of the accessory mounting space. Installed lead wires are for MCCBs. This speeds up — incorrect wiring is minimized. parallel to the side of the case. To make wiring easy and prevent to and simplifies customer response to incorrect connection, the lead wires are specification changes. provided with color coated tube and All accessories shown here can be marking on it. mounted by the customer except for motor operating mechanism and plate type padlocking device. Wide variety of internal accessory combinations Up to two auxiliary switches, two alarm switches, and one shunt trip device or undervoltage trip device quickly snap on or in. Quick and easy mounting No need to open breaker cover to mount accessories. Internal accessories easily snap into a pocket at the left of the AF93-82 AF93-81 breaker window frame. No adjustments Accessory mounting is quick and easy — accessories adjust automatically at the correct position when mounted. Shunt trip device Alarm switch Auxiliary switch Undervoltage trip device Terminal block Motor operating Mechanical interlocking Terminal covers Insulation barriers mechanism device Long type Interphase barrier Short type Earth barrier Steel enclosure Handle padlocking device Operating handles Modification kits For front mounting, For plug-in For flush mounting, Handle locking cover V type N type rear connection mounting rear connection Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog 06/6 Information subject to change without notice