Control Components
Control components are the essential elements of a motor
control center unit. Starters are the most common compo-
nent, but units may also include a wide variety of other
devices.
Starters
Furnas Brand NEMA Starters
The motor starter is the heart of the unit. The ESP100 starter
from Siemens is the first major technical advancement in
NEMA rated motor starters in more than 20 years. It com-
bines the rugged characteristics of a NEMA rated contactor
with a no nonsense solid state overload relay.
If offers the industrial user greater protection and added life
for motors in heavy duty applications. The ESP100 is ideal for
applications requiring dependability and durability.
Innova/Plus Overload Features
Front Removable Parts for Easier Accessibility
Parts may be removed from the starter without dismantling,
disconnecting line or load wires, and without taking the con-
trol from the enclosure. Front-accessible, pressure-type elec-
trical connectors are used throughout. All Innova/Plus arc box
covers are removable by loosening two front accessible cap-
tive screws.
Fewer Moving Parts
Contacts in the Innova/Plus models are opened by a stainless
steel spring-assisted gravity dropout that does not depend
upon bell cranks or other mechanical linkages. The spring
assures quick, precise opening of the contacts.
Pressure-Clamp Terminals
Starter terminals are designed for ease of wiring without
bending or looping wires. All mounting screws and pressure
terminals face clearly forward, making them easily accessible
with a screwdriver.
Single Voltage Coil
Magnetic coils are carefully wound and then encapsulated in
epoxy. Encapsulation waterproofs; promotes heat transfer;
and resists electrical, mechanical, and thermal stresses.
Silver-Cadmium Oxide Double Break Contacts
Siemens silver-cadmium oxide contacts have high conductivi-
ty and superior resistance to welding and arc erosion. Double
break contacts with large surface areas reduce resistance and
heat. Each contact terminal assembly is completely isolated
to prevent arcing when the contacts open. They are self-
cleaning and require no maintenance.
Snap-out coil and magnet
Pilot Circuit Flexibility
Extra auxiliary contacts may be added to all starters. The con-
tacts are front mounted. Starters accept up to four auxiliary
contacts, two on each side.
Permanent Air Gap
A permanent air gap magnet significantly reduces the possi-
bility of residual magnetism. It prevents the magnet and
armature from hanging up, even after millions of operations.
E1
Siemens Energy & Automation, Inc. 1000 McKee Street Batavia, Illinois 60510
SFIM-7002A-0901
Section E, September, 2001
Figure 1
- ESP100 Starter with Solid State Overload
Summary of Contents for TIASTAR SFIM-70020
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