NOTE: This Instruction Book is provided solely for the convenience of the
purchaser, and does not purport to cover all details or variations in equipment nor
to provide for every possible contingency to be met in connection with installation,
operation, or maintenance. Should further information be desired or should
particular problems arise which are not covered sufficiently for the purchaser’s
purposes, the matter should be referred to the nearest Sales Representative.
INTRODUCTION ....................................................... 3
RECEIVING AND STORAGE .................................... 3
BASIC HANDLING .................................................... 3
CIRCUIT BREAKER RATING ................................... 3
ESCUTCHEON OPERATING FEATURES ............... 3
Circuit Breaker Nameplate .................................... 4
Manual Charging Handle ....................................... 4
Manual Trip Button ................................................ 4
Circuit Breaker "OPEN" or "CLOSED" Indicator .... 4
Automatic Trip Indicator ......................................... 4
Automatic Trip Alarm Contacts .............................. 4
Automatic Trip Lockout Device .............................. 4
Padlocking Device ................................................. 4
Closing Spring Charge Indicator ............................ 4
Motor Disconnect Switch ....................................... 4
Electrical Close & Trip Push Buttons ..................... 4
Manual Close Lever ............................................... 8
Racking Mechanism .............................................. 8
CIRCUIT BREAKER INTERNAL COMPONENTS .... 8
Solid State Control Device (SSCD) ....................... 8
Shunt Trip .............................................................. 8
Close Coil .............................................................. 8
Closing Spring Charging Motor ............................. 8
Closing Spring Check Switch (CSCS) ................... 8
Auxiliary Switches .................................................. 8
Undervoltage Trip Device ...................................... 9
MPSC-2000 SOLID STATE TRIP SYSTEM .............. 9
Selecting Trip Settings ......................................... 10
OPERATING SEQUENCE FOR EO BREAKERS ... 10
CLOSING SPRING OPERATION ........................... 11
INSTALLATION, INITIAL TESTING & REMOVAL .. 11
Installation ........................................................... 11
Checking Breaker Operation in “TEST” ............... 11
Checking Breaker Operation in “CONNECTED” . 11
Manual Closing Operation ................................... 12
Circuit Breaker Removal ...................................... 12
MAINTENANCE AND ADJUSTMENTS .................. 12
Periodic Maintenance Inspection ......................... 12
Arc Chutes ........................................................... 12
Insulation Structure ..............................................13
MPSC-2000 Trip Device Removal & Installation ..13
Electrical Components (EO only) .........................13
Contact .................................................................13
Contact Pitting ......................................................13
Contact Pressure Check and Adjustment ............13
Manual Slow Close to Check Contact Pressure ..14
Operating Mechanism ..........................................14
Primary Trip Latch ............................................15
Tripper Bar Adjustment ....................................15
Primary Close Latch .........................................15
Shunt Trip Device .............................................15
FIELD TESTING THE MPSC-2000 TRIP SYSTEM 16
Instantaneous or Short Time Threshold Test .......16
Long Time Threshold Test ...................................16
Long Time Delay Test ..........................................17
Short Time Delay Tests ........................................17
Ground Trip Delay Tests ......................................17
LUBRICATION .........................................................17
DIELECTRIC TESTS ...............................................18
RENEWAL PARTS ..................................................19
Table of Contents
FIGURES
Figure 1 - Typical Electrically Operated Breaker .......5
Figure 2 - Typical Composite Schematic (EO) ...........6
Figure 3 - Contact Pressure and Adjustment ...........13
Figure 4 - Shutter Detail ...........................................14
Figure 5 - Primary Trip Latch Adjustment ................14
Figure 6 - Tripper Bar Adjustment ............................14
Figure 7 - Primary Close Latch Adjustment .............15
Figure 8 - Shunt Trip Device Adjustment .................15
TABLES
Table 1 - Secondary Disconnect Assignments ..........7
Table 2 - Electrical Characteristics of Devices ...........8
Table 3 - Undervoltage Trip Device Operating Data ..9
Table 4 - MPSC-2000 Typical Delay Bands ............16
