Product Overview

Industrial Control Power Transformers
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Siemens ICP · 2011
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Features
▪
Class MTG Industrial Control Transformers are 100%
certified for all domestic and International Applications.
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The MTG line has full compliance with IEC Safety
standards EN 61 558.
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CE Mark in accordance with requirements for EN 61 558.
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Meets IP-20 specifications per IEC 529 for finger-safe
protection when used with Siemens Touch Safe snap
on terminal cover kits. Meets IP-00 specifications when
covers are not used.
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UL Listed (File # E46323)
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CSA Certified (File #LR27533)
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Exceeds applicable requirements for control transformers as
determined by NEMA and ANSI.
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Insulation requirements is twice that of UL506.
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Proven Epoxy-encapsulated coils operate cooler and
completely seal the transformer coils against moisture,
dust, dirt and industrial contaminants for maximum
protection in hostile and industrial environments.
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Available in 50 to 750 VA sizes, in all standard voltage
combinations.
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Class 105°C (221°F) insulation system. 55°C (131°F)
temperature rise. (50–750VA typical)
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Class 180°C (356°F) insulation system. 120°C (248°F)
temperature rise. (1000–5000VA typical)
▪
Primary and secondary fusing capability available as field
installed kits for domestic or international fusing.
▪
Integrally-molded terminals and barriers between terminals
make breakage virtually impossible during wiring. The MTG
transformer construction is the same as our High Quality
Class MT transformers.
Optional Field Installed Fuse Clip Kits For Panel Mounting
▪
2-Pole primary Class CC fuse block
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1-Pole secondary midget fuse block for
13
⁄ 32 ҂ 1
1
⁄ 2 fuses
▪
2-Pole primary international type fuse blocks
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1-Pole secondary international type fuse blocks
Optional Touch-Safe Snap-On Terminal Cover Kits
The Touch-Safe terminal covers are designed to comply
with IEC 742 and IP 20 requirements. When installed,
the covers prevent contact with current carrying parts on
the transformer and are available for 4 terminal configurations.
The international fuse block kits have inherent touch
safe terminals and fuse clips.
Siemens Meets International Standards
CSA (Canadian Standards Association) was utilized as a
Competent Body in reviewing, interpreting and properly
complying with the requirements of IEC-742 to place a CE
mark on its MTG Series product. As a National Certification
Body, CSA also has the proper documentation and reports
on file for MTG Series to utilize the CB Scheme ensuring
acceptance throughout the world.
The standard Siemens MTG product is available with terminal
covers which meets the requirements of IEC-529, IP20
degree of protection and meets the applicable requirements
for covers per IEC-742.
IEC-742
The requirements for industrial control circuit transformers
to be used in the European Common Market are identified
by the International Electrotechnical Commission (IEC) and
specified under IEC-742, Non-Short Circuit Proof Isolating
Transformers, under the Low Voltage Directive 73/23/EEC.
Manufacturers of control transformers indicate compliance
with these requirements by placing a CE mark on the
product.
▪
Winding to winding insulation requirements may be twice
that for IEC-742 compared to UL506.
▪
The electrical clearances between current carrying parts
are one-third greater to comply with IEC-742 requirements
for units up to 250VA with voltages up to 440 volts ac.
▪
Transformers manufactured to IEC-742 requirements
will have a minimum of 10% higher overload capacity
than those manufactured only to UL506 requirements.
While no requirement exists in IEC-742 for the electrical
connections to be either finger safe or touch proof, the
specification does state that IF a transformer is supplied
with a cover to prevent incidental contact with current
carrying parts, that cover must utilize two separate methods
or places of securing it to the component, with neither being
dependent upon the other. Additionally, one of these methods
MUST require a tool to remove it.
IEC-529
The requirements for finger-safe or touch-proof electrical
connections are identified by the International Electrotechnical
Commission (IEC) under specification 529, Classification of
Degrees of Protection Provided by Enclosures. These various
degrees of protection are identified and differentiated by IP
ratings.
The IP specification which most closely approximates
protection to a human finger is IP20. This IP rating would
be the most common degree of touch-proof connection
for electrical components such as transformers.
EN 61 558
The requirements for industrial control transformers to be
used in the European Common Market are identified
by the IEC and specified in EN 61 558, Safety of Power
Control Transformers, under Low Voltage Directive 73/23/EEC.
CE mark on the product indicates compliance.
Class MTG
General
ICP_2010_10_2_012810Edit_ab.fm Page 2 Tuesday, September 20, 2011 8:44 AM