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Siemens I-T-E Sensitrip MD Series Information And Instruction Manual

Molded case circuit breakers
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I-T-E
Molded Case
Circuit Breakers
Bulletin SIB2.7-8
Sensitrip®
MD & ND-Frame
Information and
Instruction Guide

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Summary of Contents for Siemens I-T-E Sensitrip MD Series

  • Page 1 Sensitrip® ® I-T-E Molded Case MD & ND-Frame Circuit Breakers Information and Instruction Guide Bulletin SIB2.7-8...

  • Page 3: Table Of Contents

    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 Accessories (Cont’d.): Important Notices Shunt Trip and Undervoltage Trip General Information Mechanical and Electrical Check Dimensional Reference Drawings Auxiliary Switch and Bell Alarm Switch Mechanical and Installation Instructions...
  • Page 4 Siemens Energy & Automation, Inc. reserves the right to make changes in specifications shown herein or add improvements at any time without notice or obligation.

  • Page 5: General Information

    For detailed information, consult applicable are available for internal mounting. The installation and/or NEMA publications or your local Siemens sales office. removal of these devices is to be accomplished by qualified personnel only. Information concerning special features can (1) National Electrical Code (240-11) A current limiting overcurrent protective device, which, be found on page 58.
  • Page 6 I-T-E Sensitrip Digital Circuit Breaker MD and ND-Frame Outline Drawings 3-Pole...

  • Page 7: Installation Instructions

    D. To mount the device perform the following steps: Figure 2 For individual enclosures, panelboards and switch- boards manufactured by Siemens Energy & Auto- mation, Inc., follow the instructions provided with Install mounting screws and washers. Tighten hard- this equipment.
  • Page 8 MD and ND-Frame Trip Adjustments...
  • Page 9 MD and ND-Frame Trip Adjustments Figure 1 = Maximum circuit breaker ampere rating. = Ground Fault Pickup—a function of adjustment setting expressed in % of I = Current Rating—a function of continuous ampere adjust- ment setting expressed in % of I Adjustable Long Time Delay Adjustable Continuous Amps Switch = %I...
  • Page 10 MD and ND-Frame Trip Adjustments Figure 1 = Maximum circuit breaker ampere rating. = Ground Fault Pickup—a function of adjustment setting expressed in % of I = Current Rating—a function of continuous ampere adjust- ment setting expressed in % of I Adjustable Short Time Delay Seconds Adjustable Short Time Pickup...
  • Page 11 MD and ND-Frame Trip Adjustments Figure 1 = Ground Fault Pickup—a function of adjustment setting = Maximum circuit breaker ampere rating. expressed in % of I = Current Rating—a function of continuous ampere adjust- ment setting expressed in % of I Adjustable Ground Fault Pickup Pickup I Adjustable Instantaneous Trip Switch...
  • Page 12 MD and ND-Frame Time Current Curve 600-1000A With Short Time Delay Set on Fixed Time...
  • Page 13 MD and ND-Frame Time Current Curve 1200A With Short Time Delay Set on Fixed Time...
  • Page 14 MD and ND-Frame Time Current Curve 600-100A With Short Time Delay Set on I...
  • Page 15 MD and ND-Frame Time Current Curve 1200A With Short Time Delay Set on I...
  • Page 16 MD and ND-Frame Time Current Curve 600-100A Without Short Time Settings...
  • Page 17 MD and ND-Frame Time Current Curve 1200A Without Short Time Settings...
  • Page 18 MD and ND-Frame Time Current Curve Ground Fault Trip Data...
  • Page 19 MD and ND-Frame Time Current Curve Example...

  • Page 20: Let-Thru Curves

    MD and ND-Frame Let-Thru Curves...
  • Page 21 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...

  • Page 22: Connecting Studs

    I-T-E Connecting Studs (RS5785, RS5786) Circuit Breaker Preparation Remove terminal shield (1) from line and load side of breaker frame. Two #8-32 screws (2) each (Figure 3). 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).
  • Page 23 I-T-E Connecting Studs (RS5785, RS5786) 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).
  • Page 24 I-T-E Pressure Wire Connectors 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. Mount removable terminal shield (6) (Figure 2) to end of circuit breaker.
  • Page 25 I-T-E Pressure Wire Connectors Table 1 - Connector Selection Chart AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA Connector(2) Catalog Circuit Breaker Ampere AAAA...
  • Page 26 I-T-E Compression Connectors (CCM800, CCN1200) 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.
  • Page 27 I-T-E Compression Connectors (CCM800, CCN1200) Figure 3 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).
  • Page 28 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.
  • Page 29 I-T-E Handle Padlocking Device (MN6HPL) General Figure 2 The padlocking device, MN6HPL, consists of the handle blocking device (3) and an additional component (4) that Installation of Handle Padlocking Device permits padlock securement of the circuit breaker handle in To install the padlocking device, first complete the applicable the OFF position (Figure 3).
  • Page 30 I-T-E Plug-In Adapters Mounting Preparation (Figures 1 and 2) 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.
  • Page 31 Installation Diagrams...
  • Page 32 I-T-E Mechanical Interlock (M15404) Circuit Breaker Preparation Turn off and lock out all power supplying circuit breaker or frame before removing cover(s) or device and while cover(s) are removed. Remove terminal shield (1 ) from line and load side of breaker frame.
  • Page 33 I-T-E Mechanical Interlock (M15404) Support Tie Bar Mounting 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.
  • Page 34 I-T-E Mechanical Interlock (M15404) Using tie bar wrench carefully positioned over tie bar connector, (so as not to damage support tie bar assem- bly), pull tie bar back in direction of arrow and remove wood block. With care remove tie bar wrench. Replace handle if removed.
  • Page 35 I-T-E Mechanical Interlock (M15404) Figure 7...
  • Page 36 I-T-E Internal Accessories Accessory Mounting Instructions 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. Feed accessory leads down and through .670 x .300 in.
  • Page 37 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 Add two labels to circuit breaker Attach internal acces- sory ID label (16) (Figure 4) to top of circuit breaker on right hand side.
  • Page 38 I-T-E Internal Accessories Mechanical and Electrical Check Undervoltage Trip With breaker in TRIPPED position, connect test circuit to Shunt Trip accessory leads. Energize undervoltage trip device at 85 percent of the marked rated voltage of the coil. Reset and Reset and turn circuit breaker ON. turn breaker handle ON Attach test circuit to accessory leads.
  • Page 39 I-T-E Internal Accessories Mechanical and Electrical Check Auxiliary Switch Identification (All With Three Leads) Bell Alarm Wire Identification (All With Three Leads) AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA...
  • Page 40 I-T-E Rotary Handle Operator Types 1, 3R, 4, 4X, 12 Standard Depth (RHONSD) head screws (8) and lock washers. Torque these screws Variable Depth (RHONVD) to 25 in. Ib. Attach the breaker operator at the bottom using the four #10-14 x .500 Phillips head thread forming screws (9).
  • Page 41 Installation Diagrams...
  • Page 42 I-T-E Max-Flex 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.
  • Page 43 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.
  • Page 44 I-T-E Max-Flex Flange-Mount Handle Operator Types 1, 3R, 4, 4X, 12 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 Attach the interlock level extension (9) to the interlock lever using two #8-32-3/s in.
  • Page 45 Assembly Instructions Remove the lower terminal shield (14) from the circuit breaker and punch and drill out the two .56 in. diameter knockouts . C. Cut slots in terminal shield as shown in Figure 5, to allow access to terminal lugs after installation of breaker opera- tor.
  • Page 46 I-T-E Max-Flex Flange-Mount Handle Operator Cable Adjustment 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.
  • Page 47 ® 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.
  • Page 48 OFF button to move the breaker handle to the reset position. Automatic Reset For automatic reset, an auxiliary switch (contact Siemens for appropriate catalog number) is used to return the breaker to the OFF/RESET position after it has been tripped. This auxil- iary switch is mounted inside the breaker and wired in parallel with the OFF button.
  • Page 49 Installation Diagrams...
  • Page 50 I-T-E Panelboard Connecting Straps...
  • Page 51 I-T-E Enclosures Type 1- MND61 Type 3R - MND63 General purpose indoor, sheet-steel enclosure for use in An outdoor, sheet-steel enclosure providing protection against normal atmosphere, listed as service-entrance equipment. driving rain, sleet or snow. Listed as service-entrance equip- ment. Type 12 - MND612 A special-industry, sheet-steel enclosure for indoor use in atmosphere containing particles of lint, dust, dirt, sawdust...
  • Page 52 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.
  • Page 53 Installation Diagrams...
  • Page 54 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 trip- ping or no trip due to ground fault which could result in property damage.
  • Page 55 MD and ND-Frame Neutral Sensing Transformer 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. Connect leads from terminal X, and X2 (5) on the neutral sensing transformer (2) using the #10-32 terminal screws (6) provided (Figure 3).
  • Page 56 You will be greeted by the identifying turn-on message: "C” - Current transformer continuity test, Siemens Energy & Automation, Inc. G. The TS-31 will report the type of test you selected and TS-31 Test Set. Press ENTER to continue give you a chance to abort the test.
  • Page 57 MD and ND-Frame Universal Test Kit (TS-31) Enter Test to perform CT Resistance Test. Phase X Failed Press ENTER to exit test and continue H. If you press ENTER, you will be prompted for the phase to test: The TS-31 will display: CT Resistance Test.
  • Page 58 Ordering Information Circuit Breaker Catalog Numbers SMD6 3-Pole, 600V AC AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA...
  • Page 59 Ordering Information Circuit Breaker Catalog Numbers SND6 3-Pole, 600V AC AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA...
  • Page 60 # Title Shunt Trip AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA Control Voltage 1 Shunt Trip 1Shunt Trip and AAAA AAAA AAAA AAAA AAAA AAAA AAAA...

  • Page 61: Pressure Wire Connectors

    Ordering Information Additional Accessories Item Catalog No. Item Catalog No. Extension Handle Handle Operators (continued) Rotary - Variable Depth Mounting Screw Kit MSMN Complete Mechanism RHONVD Handle Only RHOH Pressure Wire Connectors Breaker Operator RHONBO (1) (3) (4 pcs.) 250-500 MCM Cu/Al Kit TA4P8500 Variable Length Shaft RHONSVD...

  • Page 62: Ul Listings And File Numbers

    UL Listings and File Numbers Industry Specifications AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA National Fire Protection Assoc. (National Electrical Code). I-T-E Items UL-489File CSA Report AAAA AAAA AAAA AAAA AAAA AAAA Federal Specification C-375B/GEN. Number Number AAAA...
  • Page 63 Siemens Energy & Automation, Inc. 3333 State Bridge Rd. Alpharetta, GA 30201 Bulletin SIB2.7-8 (New) (c) 1990 Siemens Energy & Automation, Inc.

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