Brochure
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2
General,
characteristics
0
Combination Starters 0
Type S, NEMA-style starters with
Disconnect switch or circuit breaker
General
Class 8538 and 8539 Type S combination starters combine the requirements of
motor overload and short-circuit protection into one package. These starters are
manufactured in accordance with NEMA standards and are UL listed. They are
designed to operate up to a 600 V maximum, 50 to 60 Hz, and are available with
solid-state overload relays.
Square D is one of the leaders in North America and Europe in providing starters that
are verified by UL to comply with IEC 947-4-1 and Type 2 coordination. This means
that the components of a motor branch circuit protective device (fuses and circuit-
breaker), contactor and overload relay will be suitable for further use following a
short-circuit fault allowing for replacement of components during normal scheduled
maintenance. Class 8538 Type S combination starters, Sizes 0–5, with fusible
disconnect switches, meet Type 2 performance criteria.
Disconnect-switch starters
Features:
b Interchangeable fuse clips, straight through wiring, solid earth/ground bar, space
for a fused control transformer, provisions for adding disconnect switch electrical
interlock, handle mechanism/door closing mechanism.
Switch-type combination starters are available with fusible or non-fusible disconnect
switches in NEMA Sizes 0–6. The switch itself is constructed of a moulded, insulated
material that delivers arc-quenching performance similar to that of high voltage
switch-gear. The visible blade construction allows you to confirm the blade position
at a glance. Many industries have standardized on this feature.
Sizes 0–2, non-fusible assemblies can be field converted to fusible designs easily
and quickly. Factory-built fusible units accept the industry-standard Class H or R
fuses. The various units have specific UL-listed short-circuit withstand ratings that
range from 5000 to 100 000 A. Specific ratings are influenced by many components
including the size of the disconnect switch and the type of fuses used with the switch.
Circuit-breaker starters
Features:
b Handle mechanism, door closing mechanism.
Options:
b Factory-installed auxiliary switch (provides remote indication of an open or tripped
breaker), factory-supplied alarm switch (actuates bell alarms or warning light when
breaker is tripped).
Square D provides both a thermal-magnetic circuit-breaker and a motor circuit
protector in NEMA Sizes 0–7 for applications requiring a breaker-type combination
starter. The most widely used over-current protection devices are thermal-magnetic
circuit-breakers. Mag-Gard
®
motor circuit protectors are similar in construction, but
provide only short-circuit protection. When Mag-Gard devices are used with motor
starters, the adjustable instantaneous trip provides maximum motor protection based
on specific amperage and application.
Type S combination starters using thermal-magnetic breakers carry a UL-listed
short-circuit withstand rating from 5000 to 30 000 A. If a Mag-Gard Type GJL breaker
is used, withstand ratings increase to 100 000 A. Specific ratings and listings may
vary depending on the specific combination of components used in the assembly.
Characteristics
Environment
Class 8538 8539
Size 0 1 2 3 4 5 6 0 1 2 3 4 5 6 7
Rated insulation voltage
Conforming to UL, CSA V 600 600
Rated impulse withstand voltage
Class H or Class K fuses kV 5 10 18 –
Class R fuses
kV 100 –
ITE circuit-breaker (FAL, KAL, LAL, MAL)
kV – 10
ITE circuit-breaker (GJL)
kV – 65 –
INST circuit-breaker (FAL, KAL, LAL, MAL)
kV – 22 (1) 22 30 (3)
INST circuit-breaker (GJL)
kV – 100 (2) –
Product certifications
UL, CSA
(1) 22 kV rating for 0–480 V. 10 kV rating for 600 V.
(2) 100 kV rating for 0–480 V. 10 kV rating for 600 V.
(3) 30 kV rating for 0–480 V. 22 kV rating for 600 V.
Fusible disconnect-switch combination starter
531043
Circuit-breaker combination starter
531042
References:
pages 2/6 to 2/21
Dimensions:
pages 2/22 and 2/23