Autotransformers Specifications

Help with Autotransformers specifications:

General Specifications


	Winding Turns
	Your choices are...
	Step-Up Transformer		In step-up transformers, the secondary voltage is larger than the primary voltage.
	Step-Down Transformer		In step-down transformers, the secondary voltage is smaller than the primary voltage.
	Variable		The transformer has a setting to change the turn ratio as needed.
	One to One		The transformer ratio is 1:1, or near 1:1.
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	Cooling Method
	Your choices are...
	Dry-type / Air Cooled		Air-cooled or dry-type transformers do not have a core. The two windings are facing each other and are surrounded by air. In large transformers, the enclosure or case is ventilated to allow air to flow and cool the windings. Because they are environmentally safe, they can be used indoors of houses or buildings.
	Oil Filled		In oil-filled power transformers, the winding and core are immersed in oil to keep the transformer cool. Oil is also used as an insulator.
	Water		The transformer is cooled with water.
	Other		Other, unlisted, or proprietary cooling method.
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	Core Type
	Your choices are...
	Laminated Core		Laminated transformers, or E-I transformers, contain laminated steel cores insulated with a nonconducting material such as varnish. They are formed into a core to reduce electrical losses.
	Split Core		Split core current transformers are designed to provide a low cost method to monitoring electrical current. A unique hinge and locking snap allows attachment without interrupting the current-carrying wire.
	Toroidal Core		Toroidal transformers typically consist of copper wire wrapped around a cylindrical core. This design prevents the magnetic flux that occurs within the coil from leaking.
	Other		Other unlisted or proprietary core types.
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	Output Voltage
	Your choices are...
	AC		Alternating current (AC) waveform output voltage values are typically expressed as RMS values. Consult the manufacturer for waveform options.
	DC		With direct current (DC) secondary voltage output, consult the manufacturer for the type of rectification.
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	Mounting / Form Factor
	Your choices are...
	Chassis Mount		A chassis-mounted transformer has tabs to facilitate screwing it down.
	Chip Transformer		Chip transformers have a form factor of an integrated circuit (IC) chip. They are typically manufactured using thin-film technology.
	Dish / Disk Mount		A simple rubber washer and metal disk or dish secures the transformer to the chassis or board. There is usually a through-hole in the middle of the disk that allows for a screw to hold the transformer down.
	H-Frame		H-frame mounting is used in applications where high vibration or shock is present. It is an "H" shaped frame that the transformer sits on. The frame is secured to the chassis or board.
	Modular Jack		Magnetics incorporated into the RJ-45 form factor ensure high common mode noise immunity, while maintaining signal integrity.
	Pad-Mounted		Pad-mounted transformers are mounted on the ground, sitting on a concrete (or other material) pad. They are normally step-down transformers used in power distribution systems to step down the voltage from the high voltage terminals of an underground distribution system to the low voltage of the end user’s needs.
	PC / PCB Mount		Any of a variety of signal transformers mounted on PCBs. They can either be surface-mounted or through-hole configurations, using the soldering method to hold the transformers. PC-mount transformers offer a small footprint for the design engineer looking to measure sensor current or voltage on a computer board. Some applications for PC or PCB transformers include sensing current overload, ground fault detection, metering, isolated current feed-back signal in switch mode power supplies, motor current load / overload, lighting, switch controls, ultra-sound current, high resolution sonar current, and isolated bi-directional current sensor with full wave bridge.
	Pole-Mounted		Pole-mounted transformers are installed on top of poles and are normally used as distribution step-down transformers servicing houses located close by.
	Other		Other unlisted, specialized, or proprietary transformer mounting techniques.
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	Type
	Your choices are...
	Three Phase / Polyphase Transformer		In polyphase (3-phase) transformers, the three primary windings are connected together and the three secondary windings are connected as well.
	Single Phase Transformer		These are transformers that operate with single phase voltage.
	Variac / Variable Autotransformer		A variac is an autotransformer with sliding tap. They are also known as variable autotransformers.
	Encapsulated Transformers		Encapsulated transformers have a protective coating of cured plastic or other encapsulant which encloses the unit and provides weatherproofing.
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Performance Specifications


	Operating Frequency Range		The frequency range for which the transformer will meet all guaranteed specifications.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Maximum Primary Voltage Rating		The maximum primary voltage rating is the input voltage range of the transformer. Transformers for use with several nominal voltages need more than one primary winding. Enter the maximum voltage required for the application. Matching products will list all primary voltages available in addition to the maximum specified.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Maximum Secondary Voltage Rating		The maximum secondary voltage rating is the output voltage range of the transformer. A transformer may provide more than one secondary voltage. Enter the maximum voltage required for the application. The matching products will list all secondary voltages available in addition to the maximum specified.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Maximum Secondary Current Rating		This is the rated output current.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Power Rating (VA)		The rated power of the transformer is the sum of the VA (volts x amps) for all of the secondary windings.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Operating Temperature:		Full required range of ambient operating temperature.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

Standards / Features


	Standards / Compliance
	Your choices are...
	RoHS Compliant		Restriction of Hazardous Substances (RoHS) is a European Union (EU) directive that requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of the following hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl and polybrominated diphenyl ether. RoHS became effective on July 1, 2006.
	ANSI		American National Standards Institute (ANSI) does not itself develop American National Standards, but it facilitates standards development by establishing consensus among qualified groups.
	CSA		Canadian Standards Association (CSA) establishes standards of safety for products and helps preserve the environment. CSA tests and certifies products for national in international companies.
	IEC		International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes international standards for all electrical, electronic, and related technologies.
	MIL-STD		The transformer satisfies U.S. military standards or specifications (MIL-SPEC). There are many testing standards associated with MIL standards.
	UL		Underwriters Laboratories Inc. (UL) is an independent, not-for-profit product safety testing and certification organization.
	TUV		TÜV Rhineland Berlin-Brandenburg appraises tests and certifies technical equipment and products according to international quality standards, and then registers those in compliance.
	VDE		The Germany-based VDE Testing & Certification Institute is accredited on a national and international level in the area of testing electrotechnical products. Testing is conducted for safety, electromagnetic compatibility, and other characteristics.
	WEEE Compliant		Waste Electrical and Electronics Equipment (WEE) is a European Union (EU) Directive that aims to encourage the reuse, recycling, and recovery of electrical and electronic equipment, and to improve the environmental impact and performance of this equipment. WEEE establishes the requirements and criteria for the collection, treatment, recycling, and recovery of this equipment. It makes producers responsible for financing these activities, and retailers and distributors must provide means for consumers to return used or obsolete equipment without charge.
	Other		Any other agency that that tests or certifies electrical, electronic, or electrotechnical products.
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	Features
	Your choices are...
	Waterproof		The transformer has a waterproof case.
	NEMA Enclosure		The transformer's enclosure satisfies NEMA standards.
	Outdoor Use		The transformer can be used outdoors.
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