I-T-E® Molded Case Circuit Breakers Bulletin SIB2.
I-T-E MD and ND-Frame Circuit Breakers 3-Pole, 600-1200 Amperes Types SMD6, SND6, SHMD6, SHND6, SCMD6, SCND6 Digital Solid State Circuit Breakers Table of Contents Important Notices 2 General Information 3 Dimensional Reference Drawings 4 Installation Instructions 5 Operational Characteristics: Trip Unit Adjustments Time Current Curves Let-Thru Curves 6-9 10-17 18 Accessories (Cont’d.
IMPORTANT The information contained herein is general in nature and is not intended for specific application purposes nor is it intended as a training manual for unqualified personnel. Refer to Note for definition of a qualified person. It does not relieve the user of responsibility to use sound practices in application, installation, operation and maintenance of the equipment purchased or in personnel safety precautions.
Information and Instructions General Information General MD and ND-Frame Solid State Sensitrip style breakers of the Sentron family, as shown on page 5, are for use in individual enclosures, switchboards, and power distribution panel boards. They are available both as 80% and 100% rated devices and in three interruption ranges as shown in the table below.
I-T-E Sensitrip Digital Circuit Breaker MD and ND-Frame Outline Drawings(1) 3-Pole 4
I-T-E MD and ND-Frame Installation Instructions General NOTE: This instruction page outlines the recommended installation procedure. The MD and ND Frame circuit breaker line includes types SMD6, SHMD6, SCMD6, SND6, SHND6 and SCND6 circuit breaker types. These devices are rated for operating voltages up to 600 V AC, 50/60Hz. Installation of Breaker SMD and SND Circuit Breaker devices are for use in individual enclosures, panelboards, switchboards or other approved equipment.
MD and ND-Frame Trip Adjustments 6
MD and ND-Frame Trip Adjustments Figure 1 In = Maximum circuit breaker ampere rating. Ir = Current Rating—a function of continuous ampere adjustment setting expressed in % of In Ig = Ground Fault Pickup—a function of adjustment setting expressed in % of In. Adjustable Continuous Amps Switch Adjustable Long Time Delay Ir = %In Seconds @ 6 x Ir All SMD-SND solid state molded case circuit breakers have an adjustable continuous amps rating switch.
MD and ND-Frame Trip Adjustments Figure 1 In = Maximum circuit breaker ampere rating. Ir = Current Rating—a function of continuous ampere adjustment setting expressed in % of In Ig = Ground Fault Pickup—a function of adjustment setting expressed in % of In. Adjustable Short Time Delay Adjustable Short Time Pickup Seconds x Ir SMD/SND models with an adjustable short time delay switch allow for selection from two modes of short time delays.
MD and ND-Frame Trip Adjustments Figure 1 In = Maximum circuit breaker ampere rating. Ig = Ground Fault Pickup—a function of adjustment setting expressed in % of In. Ir = Current Rating—a function of continuous ampere adjustment setting expressed in % of In Adjustable Ground Fault Pickup Adjustable Instantaneous Trip Switch Pickup Ig=%In Delay 12t @ 51n x Ir Instantaneous settings are multiples of the continuous current setting.
MD and ND-Frame Time Current Curve 600-1000A With Short Time Delay Set on Fixed Time 10
MD and ND-Frame Time Current Curve 1200A With Short Time Delay Set on Fixed Time 11
MD and ND-Frame Time Current Curve 600-100A With Short Time Delay Set on I2t 12
MD and ND-Frame Time Current Curve 1200A With Short Time Delay Set on I2t 13
MD and ND-Frame Time Current Curve 600-100A Without Short Time Settings 14
MD and ND-Frame Time Current Curve 1200A Without Short Time Settings 15
MD and ND-Frame Time Current Curve Ground Fault Trip Data 16
MD and ND-Frame Time Current Curve Example 17
MD and ND-Frame Let-Thru Curves 18
I-T-E Connecting Studs (RS5785, RS5786) General These connecting studs can be used on 3-pole circuit breakers and on line and load terminals. Both the long stud RS5785 and the short stud RS5786, can be used on adjacent poles or alternated, as required by the installation. Figure 1 Connecting Studs Attached To Breaker Mounting Preparation A. Turn off and lock out all power supplying circuit breaker before installing. B. Drill mounting panel as shown in drilling plan, Figure 1.
I-T-E Connecting Studs (RS5785, RS5786) Circuit Breaker Preparation A. Remove terminal shield (1) from line and load side of breaker frame. Two #8-32 screws (2) each (Figure 3). B. Attach the connecting studs (3) as shown in Figure 4, to each pole of the circuit breaker with two 5/8-18 hex head cap screws, flatwashers and lockwashers (4). Torque the screws to 72 lb. in.
I-T-E Connecting Studs (RS5785, RS5786) F Remove the positioning template. G. Mount the circuit breaker by positioning it over the rear busbar mounting pads. Attach each pole (Line and Load) of the circuit breaker to the connecting busbars with the two 5/16-18 hex head cap screws, flatwashers and lockwashers (4) (Figure 4). Torque each screw to 72 in. lb. H. Insert the end shields (7) into the slots provided at the line and load ends of the breaker (Figure 4). I.
I-T-E Pressure Wire Connectors E. Attach power cables to connectors and tighten set screws (5) (Figure 1) to specifications per Table 1. NOTE: Cables must extend straight for at least 4 inches from face of connector to clear shield. F Mount removable terminal shield (6) (Figure 2) to end of circuit breaker. Shield should be flush with end of circuit breaker. G. Re-assemble terminal shield. NOTE: When terminal cover is properly installed, wire connector shield should be held securely.
I-T-E Pressure Wire Connectors Table 1 - Connector Selection Chart AAAA AAAA AAAA AAAAA AAAA AAAA AAAA AAAAA AAAA AAAA AAAAAAAA AA AAAAAAAA AAAAA AAAA AAAAAAAA A Connector(2) Catalog CircuitAAAA Breaker Ampere AAAA AAAA AAAA A AAAA A AAAA AAAA A Connector WireAAAA Range AAAA SetAAAA Screw Torque For AAAA Use With AAAA Type(s) A Numbers Rating (In) AAAA AAAAA AAAA AAAAA AAAA AAAAA AAAA AAAAA AAAA AAAAAAAA AAAAAAAA AAAAAAAA A AAAAAAAA AAAAAAAA A AAAAAAAA AAAAAAAA A AAAAAAAA AAAAAAAA A AAAAAAAA AAAAAA 500-60
I-T-E Compression Connectors (CCM800, CCN1200) F Remove cap from compression connector and insert cable fully into barrel (1) (Figure 1 ) of connector. G. Insure that connector tang(s) (2) (Figure 1) are in their proper orientation prior to crimping. This helps avoid twisting of cables during installation. General NOTE: This instruction sheet outlines the recommended installation procedure. Use of lugs may result in reduced wire bending space.
I-T-E Compression Connectors (CCM800, CCN1200) Figure 3 K. Position connector tang on top of the circuit breaker terminal pad and secure with 3/8-16 X 11/2 in. socket head cap screw and conical spring washer Conical spring washer is to be installed with convex side of washer toward underside of screw head (Figure 4). Torque screw to 228 in. lb.
I-T-E Handle Blocking Device (MN6BL) D. With a screwdriver, turn the screws so they enter the blind holes molded in each side of the toggle handle. Tighten the two screws evenly so that when they engage the bottom of the blind holes, they project an equal distance of .094 in. (Figure 2) above the tapped surface. Do not over torque. Maximum torque 2 in. Ib. General The handle blocking device, MN6BL, is provided to permit blocking the toggle handle of an MD and ND-Frame circuit breaker in the OFF position.
I-T-E Handle Padlocking Device (MN6HPL) General The padlocking device, MN6HPL, consists of the handle blocking device (3) and an additional component (4) that permits padlock securement of the circuit breaker handle in the OFF position (Figure 3). Field modification of the handle blocking device will also permit padlock securement of the circuit breaker handle in the ON position.
I-T-E Plug-In Adapters Mounting Preparation (Figures 1 and 2) A. If the switchboard mounting plate (1 ) is to be used, provide required drilling as shown in Figure 1. B. If other mounting means are to be used, provide the cutouts and drilling required to mount the adapter blocks as shown in Figure 2. Switchboard Mounting Plate (If used Figure 3) A. NOTE: Plug-in adapters are for use only with MD-Frame. Mounting Block (Figure 3) A.
Installation Diagrams 29
I-T-E Mechanical Interlock (M15404) Circuit Breaker Preparation Figure 1 30 A. Turn off and lock out all power supplying circuit breaker or frame before removing cover(s) or device and while cover(s) are removed. B. Remove terminal shield (1 ) from line and load side of breaker frame. Two #8-32 screws each (Figure 1). C. Remove load cover (2) from breaker frame. Six #10-32 x 3/4 screws and two #10-32 x 13/8 in. screws (Figure 1). D.
I-T-E Mechanical Interlock (M15404) Support Tie Bar Mounting A. With 9-in. long tie bar wrench (8) supplied (Figures 2 and 3) positioned around left pole tie bar connector (9), pull tie bar connector back in direction of arrow (away from trip unit) and drop safety wood block (10) with 1-in. dimension into gap between tie bar connector and trip unit on right pole. Wood block should come to rest snugly on the two socket head cap screws as shown in Figure 4. Remove wrench.
I-T-E Mechanical Interlock (M15404) D. Using tie bar wrench carefully positioned over tie bar connector, (so as not to damage support tie bar assembly), pull tie bar back in direction of arrow and remove wood block. With care remove tie bar wrench. E. Replace handle if removed. NOTE: Tab on front of handle must be aligned toward line end. F Replace load cover The six #10-32 x 3/4 in. screws must be installed toward the line side of the circuit breaker. The two 10-32 x 13/8 in.
I-T-E Mechanical Interlock (M15404) Figure 7 33
I-T-E Internal Accessories Accessory Mounting Instructions A. Circuit Breaker Preparation A. Turn power off supplying device before installing kit. B. Make sure device is in tripped position. For circuit breakers, depress the red TRIPPED button (1 ) (Figure 1). On molded case switches, removing the cover will trip the mechanism . Feed leads through opening at bottom of accessory case for right hand or left hand mounting in breaker Leads should always exit accessory toward outer edge of breaker.
I-T-E Internal Accessories Figure 3 C. Check handle for proper fit on handle arm. Replace load end cover and cover screws. (quantity 8) Replace All Covers and Shields A. Add two labels to circuit breaker Attach internal accessory ID label (16) (Figure 4) to top of circuit breaker on right hand side. Make sure it is located in the proper space on existing label.
I-T-E Internal Accessories Mechanical and Electrical Check Undervoltage Trip A. With breaker in TRIPPED position, connect test circuit to accessory leads. Energize undervoltage trip device at 85 percent of the marked rated voltage of the coil. Reset and turn breaker handle ON B. Reduce voltage to 35 percent of rated coil voltage. Circuit breaker must trip. Shunt Trip A. Reset and turn circuit breaker ON. B. Attach test circuit to accessory leads.
I-T-E Internal Accessories Mechanical and Electrical Check Auxiliary Switch Identification (All With Three Leads) AAAA AAAA AAAAA AAAA AAAA AAA WireAAA Wire AAAA Switch Terminals orAAAA Contacts AAAA AAA AAAA A AAAA AAAA AAAA AAA Markings Color AAAA AAA AAAA A AAAA AAAA AAAA AAAA AAA AAAA AAA AAAA A AAAA AAAA AAAA AAAA AAA C1 or C2 White C.
I-T-E Rotary Handle Operator Types 1, 3R, 4, 4X, 12 Standard Depth (RHONSD) Variable Depth (RHONVD) head screws (8) and lock washers. Torque these screws to 25 in. Ib. Attach the breaker operator at the bottom using the four #10-14 x .500 Phillips head thread forming screws (9). Torque to 20 in. Ib. maximum (Figure 4). NOTE: The mounting holes are under the labels.
Installation Diagrams 39
I-T-E Max-FlexTM Flange-Mount Handle Operator Types 1, 3R, 4, 4X, 12 the switch handle operator on the flange section of the enclosure. Application The Max-Flex Operator is designed to work with l-T-E circuit breakers having current ratings through 1200 amperes. The Max-Flex unit meets all the industrial criteria such as UL and Automotive Industry Standards. Design The new Max-Flex Handle Operator provides maximum flexibility in design and assembly of electrical equipment.
Assembly Instructions MD and ND-Frame Application A complete kit consists of handle, cable and breaker operator The handle can be mounted on either right hand or left hand flange type enclosures. It can be locked in the OFF position with up to three padlocks. A two piece door catch is provided for applications where no interlocking door latch mechanism is provided. The breaker operator mounts to the circuit breaker and can be padlocked in the OFF position.
I-T-E Max-FlexTM Flange-Mount Handle Operator Types 1, 3R, 4, 4X, 12 D. Place the plastic washer and connecting link onto the bellcrank pin (7). Secure the connection with the E-ring retainer supplied (8) (Figure 3). Secure E-Ring Connection E. Attach the interlock level extension (9) to the interlock lever using two #8-32-3/s in. screws and #8 lockwashers. Screws mount through the threaded lever extension into the lever Tighten to 25 in.-lb. (Figure 3).
Assembly Instructions B. C. Remove the lower terminal shield (14) from the circuit breaker and punch and drill out the two .56 in. diameter knockouts . Cut slots in terminal shield as shown in Figure 5, to allow access to terminal lugs after installation of breaker operator. Caution: Replace the terminal shield. D. Mount circuit breaker to the enclosed panel using the four breaker mounting screws as shown in Figure 5. E. Attach the breaker operator using two 1/4-20 x 1/2 in.
I-T-E Max-FlexTM Flange-Mount Handle Operator Cable Adjustment A. Check that the circuit breaker turns OFF and ON by moving the operating handle up for ON and down for OFF If the breaker does not switch ON, loosen the cable mounting nuts at the fixed plate tab. Hold the operating handle in the maximum ON position and move the cable toward the top of the breaker. Retighten the mounting nuts to secure. B. Trip the circuit breaker by pushing the PUSH TO TRIP button C.
I-T-E TELEMAND® Electric Motor Operator General The motor operated mechanism is designed to open, close and reset a circuit breaker or switch by remote control. The customer must supply the circuit breaker or switch normally ON and OFF push buttons, external wiring, a control power source, and all control logic. Consult the wiring diagram (Figure 3, page 47) for a typical control connection. The motor operator is hinged for opening to the left or right dependent on catalog number designation.
I-T-E TELEMAND® Electric Motor Operator F. With the circuit breaker handle in the OFF position, align the motor operator mechanism rollers (indicator to be in OFF position) and the circuit breaker handle by rotating the lead screw (6) with a screwdriver. The lead screw access hole is at the bottom of the motor operator (Figure 2). G. Close and latch the mechanism cover H.
Installation Diagrams 47
I-T-E Panelboard Connecting Straps(1) 48
I-T-E Enclosures Type 1- MND61 Type 3R - MND63 General purpose indoor, sheet-steel enclosure for use in normal atmosphere, listed as service-entrance equipment. An outdoor, sheet-steel enclosure providing protection against driving rain, sleet or snow. Listed as service-entrance equipment.
I-T-E Door Latch Mechanism (DKR2, DKR3, DKL2, DKL3) H. Turn the handle 1/4 turn clockwise (looking from inside the enclosure door) and attach the latch plate roller to the handle shaft, while inserting the bent leg of the spring into the hole in the latch plate. Fasten with a locking-type flange nut. Tighten the ,nut, then loosen l/8 turn to allow movement of the roller assemblies (Figure 1). NOTE: Straight leg of spring must rest against pin (12) on handle plate. See inset on Figure 1. I.
Installation Diagrams 51
MD and ND-Frame Neutral Sensing Transformer Caution: The ampere rating of the transformer must be the same as the circuit breaker Max. Rating (In) for proper operation. Failure to match neutral sensor ampere rating with breaker ampere rating may result in nuisance tripping or no trip due to ground fault which could result in property damage. Bus Bar System Mounting. A. Turn OFF power feeding this device before starting the installation. B.
MD and ND-Frame Neutral Sensing Transformer D. Slide the transformer (2) over the cables and mount (1) to panel (7) with 1/4-20 screws, lockwashers, and nuts (3). NOTE Mount screws (3) in direction shown (Figure 3) to maintain electrical spacing. E. Connect leads from terminal X, and X2 (5) on the neutral sensing transformer (2) using the #10-32 terminal screws (6) provided (Figure 3).
MD and ND-Frame Universal Test Kit (TS-31) Catalog Number xxxxxx Not Found. Press Enter to Continue and you will be asked to enter another catalog number. E. If valid catalog number has been entered, the TS-31 will prompt for the Breaker switch settings. The TS-31 will respond with: Enter continuous current setting in %. Enter instantaneous pickup setting. Enter long time delay in seconds. For breakers with short time functions you may be asked one of the following: Enter short time Pickup.
MD and ND-Frame Universal Test Kit (TS-31) Enter Test to perform H. If you press ENTER, you will be prompted for the phase to test: The TS-31 will display: Enter phase to test. I. CT Resistance Test. Phase X Short Press ENTER to exit test and continue “A” - Phase A or left pole. “B” - Phase B or center pole. “C” - Phase C or right pole. The “Phase X Failed” message indicates that the CT resistance is neither open nor shorted, but is not within design tolerance. Press Enter again to start the test.
Ordering Information Circuit Breaker Catalog Numbers SMD6 3-Pole, 600V AC AAAA AAA AAAA AAAA AAAAA AAAA AAAA AA AAAA AAAAA AAAA AAAA AAAAA AAAA AAAAA AAAA AAAA AAAA AAAA AAAA AAAA AA AAAA AAA AAAA AAAA A AAAA AA AAAA A AAAA A A AAAA AAAA AAAA AAAA AAAA AA AAAA AAA AAAA AAAA A AAAA AAAA AA AAAA A AAAA AAAA A AAAA A AAAA AAAA AAAA AAAA AAAA A AAAA AA AAAA AAA AAAA AAAA A AAAA AAAA AA AAAA A AAAA AAAA A AAAA A AAAA AAAA AAAA AAAA AAAA A AAAA AA AAAA AAA AAAA AAAA A AAAA AAAA AA AAAA A AAAA AAAA A AAAA A AAAA
Ordering Information Circuit Breaker Catalog Numbers SND6 3-Pole, 600V AC AAAA AAA AAAA AAAA AAAAA AAAA AAAA AA AAAA AAAAA AAAA AAAA AAAAA AAAA AAAAA AAAA AAAA AAAA AAAA AAAA AAAA AA AAAA AAA AAAA AAAA A AAAA AA AAAA A AAAA A A AAAA AAAA AAAA AAAA AAAA AA AAAA AAA AAAA AAAA A AAAA AAAA AA AAAA A AAAA AAAA A AAAA A AAAA AAAA AAAA AAAA AAAA A AAAA AA AAAA AAA AAAA AAAA A AAAA AAAA AA AAAA A AAAA AAAA A AAAA A AAAA AAAA AAAA AAAA AAAA A AAAA AA AAAA AAA AAAA AAAA A AAAA AAAA AA AAAA A AAAA AAAA A AAAA A AAAA
# Title Shunt Trip AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAA Control Voltage 1 Shunt Trip AAAAAAA 1Shunt Trip and AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAA AAAA AAAA AAAA AAAA AAA 1 Auxiliary Switch AAAA AAAA AAAA AAAA AAAA AAAA A AAAA AAAA AAAA AAAA AAA AAAA AAAA AAAA AAAA AAA AC DC Catalog Number Catalog Number AAAA AAAA AAAA AAAA A AAAA AAAA AAAA AAAA AAA AAAA AAAA AAAA AAAA AAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA 120 208 240 277 480 600 12 24 48 125 250 S01MN6
Ordering Information Additional Accessories Item Catalog No. Extension Handle EX9 Mounting Screw Kit MSMN Pressure Wire Connectors (4 pcs.) 250-500 MCM Cu/Al Kit (1) (3) TA4P8500 (2 pcs.) 600-750 MCM Cu/Al Kit (1) (3)TA2K8750 (3 pcs.) 250-700 MCM Cu/Al Kit (1) (3)TA3P8750 (2 pcs.) #1 AWG-500 MCM Cu/Al TA2K500 (3 pcs.) #I/0-500 MCM Cu/Al TA3K500 (2 pcs.) #1 AWG-500 MCM Cu TC2K500 (3 pcs.
UL Listings and File Numbers Industry Specifications AAAA AAAA AAAA AAAA AAAAA AAAA AAAA I-T-E Items AAA UL-489File CSA ReportAAA AAAA AAAA AAA AAAA AAAA A AAAA AAA Number Number AAAA AAAA AAA AAAA AAAA A AAAA AAAA AAA AAAA AAAA AAA AAAA AAAA A AAAA AAAA AAA Breakers E10848 LR57039 Terminal Connectors Plug-ln Connectors Rear Studs Accessories Shunt Trip Undervoltage Trip Aux. Switch Bell Alarm Switch Enclosures E23615 (sp.
Siemens Energy & Automation, Inc. 3333 State Bridge Rd. Alpharetta, GA 30201 Bulletin SIB2.7-8 (New) (c) 1990 Siemens Energy & Automation, Inc.
