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SPRECHER + SCHUH CONTROL COMPONENTS


SPRECHER + SCHUH: PRODUCT OVERVIEW

 


WELCOME

--------------------------------------------------------------------------------

 


ABOUT SPRECHER + SCHUH




Sprecher + Schuh Controls are industry leaders in providing IEC control
components for industrial applications. Their innovative product line includes a
wide array of industrial motor control products, including general and definite
purpose contactors, overload relays, motor circuit controllers, disconnect
switches and pilot devices.


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Sprecher + Schuh Control Parts




ABOUT US



We are a value-added distributor of industrial controls and enclosures, adhering
to the philosophy of providing our customers with high quality, new products
that are supported by factory warranties and knowledgeable customer service. Our
goal is to help meet your cost and lead time requirements and make you a long
term customer.


Call 800.739.9145 for Immediate Assistance with Sprecher + Schuh Parts

Please select the following category to view our product line


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GENERAL PURPOSE AND DEFINITE PURPOSE CONTACTORS






CEP7 CONTACTORS






CIRCUIT PROTECTION






PILOT DEVICES






TERMINALS





 

--------------------------------------------------------------------------------







NEMA VS IEC



How do NEMA- and IEC-style electromechanical motor control products differ?

In today's business environment, flexibility is an asset. If you're able to
apply either IEC- or NEMA-style products, you have the flexibility to adapt to
local traditions and product supply anywhere in the world. This allows you to
take the best advantage of local availability and expertise, which can be an
important competitive edge in a global economy. Before applying this
flexibility, however, you need to know the differences between NEMA and IEC
designs.




DIFFERING PHILOSOPHIES

The NEMA philosophy emphasizes more robust designs for broader applicability.
Ease of selection and breadth of application are two of the fundamental
mainstays within its design philosophy.


Governing the design of NEMA motor control products is the NEMA Industrial
Control Standard (ICS-2). This formal document contains all of the information
about the design of electromechanical NEMA-style motor control.


The IEC philosophy, on the other hand, is application and performance. In
selecting IEC devices, you need a more sophisticated level of knowledge about
the application than is necessary when selecting a NEMA general-purpose device.
For example, you need to know motor load, duty cycle, and full load current
(FLC) when selecting an IEC contactor.


This requirement, which may be a drawback in some segments, is a significant
advantage in Original Equipment Manufacturer (OEM) segments. For example, an
equivalent hp-rated IEC device tends to be substantially smaller than its NEMA
counterpart; this represents a significant advantage for most OEM designers.
Also, IEC products tend to be less expensive.


NEMA FEATURES AND BENEFITS

Ease of selection is the fundamental design advantage of a NEMA-style starter.
To effectively select a NEMA-style product, you only need to know the horsepower
and voltage.

Serviceability is another key in the NEMA market. Most NEMA products are
serviceable and provide front access to internal parts. Unless a total device
replacement is necessary, contacts and coils of all sizes can be repaired
usually without removing the device from the panel.

Reserve capacity is a consideration in the ease of selection of NEMA products.
They are designed to be very robust and broadly applicable. They are
"general-purpose," as opposed to being more specific and/or application
intensive.

NEMA-style devices have interchangeable heater elements. In fact, a range of
thermal units are available for the overload. This characteristic makes a NEMA
product attractive on many construction jobs, where the ultimate motor schedule
or the actual motor nameplate is not known until close to the start-up date.

The motor control center (MCC) or Enclosed Package Solution is a NEMA tradition.
Most NEMA products are sold as starters, in either open-style or various
enclosed versions.


IEC FEATURES AND BENEFITS

The large number of IEC contactor sizes allows you to more closely match the
contactor to the load or application. Unlike NEMA, where the available sizes are
standard across the industry, the number of different contactor size ratings
varies by manufacturer.

Generally, an IEC starter is about half the size of a comparable NEMA starter.
Above 100A (NEMA Size 3), however, the physical differences between NEMA and IEC
are negligible.

IEC products are more modular in nature; they can snap onto a 35-mm, or in
larger sizes, a 75-mm DIN rail. This eliminates the need to drill holes and
mount each component individually. Thus, putting them into a panel is relatively
easy.



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Unlike NEMA starters, which typically are sold fully assembled, IEC starters
typically are sold as components (a contactor, an auxiliary block, an overload
relay block) so that you can make your own assembly. You simply select the
accessories needed for the application and snap them together, without the use
of tools.

Also unlike NEMA starters, IEC-style thermal overload relays typically have
fixed thermal elements, with an adjustment range that may require replacing the
complete overload relay when significant motor FLC changes due to application
requirements.

A large number of IEC contactors are applied in group installations, and NEC
Sec. 430-53 deals with this application facet. However, this isn't unique to IEC
contactors, since you can install any starter this way.

IEC products, more often than not, are sold to OEMs, which typically install
them in applications where multiple devices are needed to control different
functions of a machine.

Type 2 coordination is an IEC standard that can be applied to a NEMA-style
product as well. Type 2 protection is afforded by the use of a properly rated
and class of fuse with a contactor or starter. This type of protection requires
that, after short-circuit condition testing, the con-tactor or starter must be
reusable without component or part replacement. Also, no significant change is
allowed in the operating time-current characteristics of the overload relay.
This is a coordinated protection standard for the short-circ uit protective
device, contactor, and overload relay. The rules are the same for both IEC- and
NEMA-style devices.

For Type 2 coordination, the typical higher withstand rating of a NEMA-style
starter provides a greater selection of short-circuit protective devices. Type 2
coordination with IEC-style products will offer the same coordination and degree
of protection; however, the selection of fuse classes may be more limited. For
short-circuit currents up to 5000A, Type 2 protection for IEC-rated motor
starters would require Class RK5, J, RK1, or CC fuses. For short-circuit
currents up to 100kA, Class RK1, J, and CC fuses are required.



Compared with NEMA-style products, IEC-style products are more disposable than
serviceable. In fact, IEC products below 100A typically are considered
disposable; they can be removed from a DIN rail, thrown away, and replaced with
a new product in a matter of minutes.

Self protected starters represent a new category of combination starters as
defined in UL 508-E. Typically, such a starter has a contactor, an overload
relay, and short-circuit protection. The device also undergoes a unique testing
procedure, one that goes beyond that for conventional combination motor
controllers. This procedure tests the starter at different fault levels,
verifying that coordinated protection similar to Type 2 is provided.


TRAINING

Training is one of the biggest differences between IEC- and NEMA-style products.
Because of their application-specific designs, IEC products require a more
precise application knowledge in the selection process. Many of the IEC
variables aren't necessary when selecting a NEMA-style product.

Does this mean you need a lot more training before you can select an IEC
product? Probably not; it just means that your training has to be very specific
in nature. Selecting IEC products simply requires more time and knowledge
upfront, to ensure the selection matches the application.

Once the proper selection is made, however, both IEC- and NEMA-style products
will deliver similar performance.



RELATED ARTICLE: TABLE 1. NEMA-STYLE DESIGN FEATURES AND BENEFITS








        

 * Easy to select and apply: can be specified early in the project. Detailed
   motor load data is not necessary to size device.



 * High withstand capability: suited to heavy-duty applications with little
   concern for derating.



 * Wide range of field installable accessories.



 * Easy to maintain: contacts are easily inspected; coils are quickly changed.



 * Wide range of enclosure types: NEMA Type 1, 3R, 4, 4X, 7, 9, and 12.



 * Table 2. IEC-style design features and benefits



 * Meet IEC standards: acceptable worldwide



 * Compact size: saves panel space. (30% to 80% smaller than NEMA).



 * 35 mm DIN rail mounting: saves installation time.



 * 45 mm width and 45 x 60 mm mounting hole spacing on small contactors:
   interchangeability among manufacturers without panel modification.



 * Fingersafe terminals: safety for operating and maintenance personnel.



 * Ambient-compensated bimetallic overload relay: compensates for varying
   temperatures at the controller.



 * Automatic reset, field-convertible: suitable for remote or inaccessible
   locations.



 * Test-to-trip feature: simulates trip condition by mechanically operating trip
   mechanism, reducing start uptime.



 * Broad range of factory-assembled starters: nonreversing and reversing;
   two-speed; combination; reduced voltage; duplex.

 

  Back to Top





 * Contactors
   Series CA5
 * Contactors
   Series CA6
 * Contactors
   Series CA7
 * Contactors
   Series CA8
 * Contactors
   Series CAL7 Lighting
 * Contactors
   Series CAN7 & CAN6 Nema
 * Contactors
   Series CDP Definite Purpose
 * Overload Relays
   CEP7 Solid State
 * Overload Relays
   CEP7 Motor Protection
 * Thermal Overload Relays
   Series  CT8
 * Contactors & Starters
   Series  CA8 &  CT8
 * Enclosed Starters
   KWIKstarters II
 * Suplementary Protectors
   Series  L8
 * Circuit Breakers
   Series  L9 UL-489
 * Monolithic Pilot Devices
   Series  D7D Pushbuttons
 * PCS Softstarters
   Intelligent Controller
 * Pilot Devices
   Series D7
 * Terminals
   Series V7-W





 

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Toll-free: (800) 739-9145 | Local: (918) 665-6888

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