Reference No. 278AS
Bulletin No 30072-013-10
Raleigh, NC, U.S.A., April, 1992
Supersedes 8502/36-278 dated 6/88
2- and 3-Pole AC Magnetic Contactors and Starters
Type SC, Series A or B
Classes 8502 and 8536 - Size 1 and 1P
This instruction bulletin illustrates and describes Class 8502 and 8536 two- and
three-pole magnetic contactors and starters. It also contains assembly,
modification and parts ordering instructions. To identify parts, refer to Figure 1.
Figure 1 Contactor and Starter Assembly Drawing
Disconnect all power before working on equipment.
Electrical shock will cause severe injury or death.
Series B only applies to the Type S Starter Form B (ambient compensated
overload relay block). All parts of Form B Series A and B starters are
interchangeable, only the overload relay block differs. If the overload relay block
of a Form B Series A starter is replaced with the Series B block, the overload
relay thermal units must be selected from the Series B thermal unit selection
tables for proper motor protection.
All contactors are supplied with a normally-open holding circuit contact as
standard. Additional normally-open or normally-closed auxiliary contacts can be
installed in the field. Refer to Table 5 for class and type. For application
information, refer to Instruction Bulletin 9999-287 or the Square D Digest.
NEMA 1 general purpose enclosures with slip-on or hinged covers are supplied
with knockouts for field addition of the kits listed in Table 1
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