TM 5-3895-374-24-1 Bulletin No  30072-013-10 Reference No  278AS April, 1992 Table 1   Field Modification Kits, Class 9999 Slip-on Hinged Door Factory Modifications Kit Enclosure Enclosure (Form) Push button, Start-Stop SA2 SA3 A Push button, On-Off SA10 SA3 A3 Selector switch, Hand-Off-Auto SC2 SC8 C Selector switch, On-Off SC22     C6 Red pilot light   SP15R SP28R è P1 ?   For 120 V only, for other voltages refer to Class 9001 Type KP units. OVERLOAD DELAYS TERMINALS INSPECTING AND REPLACING CONTACTS MANUAL OPERATION COIL RE- PLACEMENT A melting alloy overload relay is supplied as standard with provisions for three thermal units.  The contact unit (item 6 in Figure 1) of the melting alloy overload relay is available with a normally-open or normally-closed isolated alarm contact in addition to the standard normally-closed contact.  The contact unit with alarm circuit contacts can be installed in the field (refer to Table 5). Non-temperature compensated bimetallic overload relays are available as an optional feature: Form B 1 has provisions for two thermal units, Form B2 has provisions for three thermal units.  Ambient- temperature compensated bimetallic overload relays are also available as an optional feature (Form B has provisions for three thermal units). A SPDT contact is supplied as standard on all Type S bimetallic overload relays.  The N. O. contact can  be  used  in  an  alarm  circuit  and  must  be  wired  on  the  same  polarity  as  the  N.  C.  Contact. Contacts are not replaceable.  In order to directly replace a bimetallic overload relay, the appropriate part number listed on the parts list should be used. These overload relays are not designed for field repair and should not be disassembled. Use  copper  wire  only  on  device  power  and  control  terminals.    Pressure  wire  power  terminals  are suitable for wire sizes #14-8, solid or stranded.  Pressure wire control terminals are suitable for wire sizes #16-12, solid or stranded. Contacts  are  not  harmed  by  discoloration  and  slight  pitting.    Do  not  file  contacts,  as  it  wastes contact  material.    Replacement  is  necessary  only  when  the  contact  has  worn  thin.    Replacement contacts for starters or contactors are available as kits.  Older from Table 5. Replacement contacts and springs for the poster pole kits only are contained in a Class 9998 Type SL22 kit.  One kit is required for each N. O. or N. C. Contact. It  is  unnecessary  to  remove  any  wiring  to  inspect  or  replace  the  contacts.    To  inspect  or  replace contacts,  loosen  the  two  captive  screws  (item  C  in  Figure  1)  holding  the  contact  actuator  to  the contact block.  Lift the contact actuator to expose the contacts. WARNING HAZARDOUS VOLTAGE. Disconnect all power before manually operating equipment. Manual operation with power on car, cause contact arcing and unexpected energization of load, resulting in personal injury or equipment damage. Manual  operation  of  contactors  and  starters  may  be  accomplished  by  pushing  the  contact  carrier down with a screwdriver.  There is a slot provided on the coil cover that is suitable for this use. To remove the coil, loosen the two captive cover screws (item A in Figure 1).  Disconnect wires from the coil terminals and remove the cover.  Remove and disassemble the magnet, coil and armature unit. © 1992 Square D All Rights Reserved (page 3-109)