Variac Selector

 Portable Variacs with Cord Plug Receptacle

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 Single Phase Variacs, 120VAC Input; 0-140VAC Output

 Single Phase Variacs, 120VAC Input; 0-280VAC Output

 Single Phase Variacs, 240VAC Input; 0-280VAC Output

 Single Phase Variacs, 240VAC Input; 0-560VAC Output

 Single Phase Variacs, 480VAC Input; 0-560VAC Output

 Three Phase Variacs, 240VAC Input; 0-280VAC Output

 Three Phase Variacs, 240VAC Input; 0-560VAC Output

 Three Phase Variacs, 480VAC Input; 0-560VAC Output

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Staco Variable Transformer 100/200 Series

See Important Notes at the end of the page.

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1 & 3 Ganged 100-200 Series Variac

100/200 Series Variac Drawings 

Portable Series Variac Drawings

* All 100/2000 Series Variable transformers can operate to 2000 Hz without derating the specifications shown below.

Single Phase 120V Input

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz *	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
171		120	1 PH	50/60	0-120	1.75A	2.2A
				60	0-132	1.75A
201		120	1 PH	50/60	0-120	2.00A	2.5A
				60	0-132	2.00A
221B		120	1 PH	50/60	0-120	2.50A	3.2A
				60	0-132	2.50A
3PN221B		120	1 PH	60	0-132	2.50A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle
291		120	1 PH	50/60	0-120	3.00A	3.5A
				60	0-132	3.00A

Single Phase 240V Input

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz *	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
252		240	1 PH	50/60	0-240	0.8A	1.0A
					0-264	0.8A
171-2		240	1 PH	50/60	0-240	1.75A	2.2A	2-Ganged Unit
				60	0-264	1.75A
201-2		240	1 PH	50/60	0-240	2.00A	2.5A	2-Ganged Unit
				60	0-264	2.00A
221B-2		240	1 PH	50/60	0-240	2.50A	3.2A	2-Ganged Unit
				60	0-264	2.5A
291-2		240	1 PH	50/60	0-240	3.00A	3.5A	2-Ganged Unit
				60	0-264	3.00A

Single Phase 480V Input

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
252-2		480	1 PH	50/60	0-480	0.8A	1.0A	2-Ganged Unit
					0-528	0.8A

Three Phase 240V Input

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz *	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
171-3		240	3 PH	60	0-240	1.75A	2.20A	3-Ganged Unit
201-3		240	3 PH	60	0-240	2.00A	2.5A	3-Ganged Unit
221B-3		240	3 PH	60	0-240	2.50A	3.2A	3-Ganged Unit
291-3		240	3 PH	50/60	0-240	3.00A	3.5A	3-Ganged Unit

Three Phase 480V Input

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
252-3		480	3 PH	50/60	0-480	0.8A	1.0A	3-Ganged Unit
				60	0-528	0.8A

100/200 Series Variac Drawings  
Portable Series Variac Drawings

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Important Notes:

CURRENT RATING TERMINOLOGY: To permit maximum utilization of STACO Variable Transformers, output ratings are given for both constant current and constant impedance loads. All current ratings are based on continuous use at ambient temperatures to 122 F (50 C).  Use derating curve for higher ambients.  Short duration overloads to 10 times transformer rating are possible.  See graph for acceptable limits.

CONSTANT CURRENT RATING: Output current that can be carried regardless of output voltage setting. (Reduce, for output above 125% of input voltage, on voltage doubler connection. See Graph)

CONSTANT IMPEDANCE RATING: Output current that can be carried with loads such as incandescent lamps or resistance heaters in which the current drawn is approximately proportional to the applied voltage, increasing to maximum current at line voltage. This rating applies only to applications where maximum output voltage is limited to line voltage.

THREE PHASE CONNECTED TRANSFORMERS: If ganged units are used in a system that ordinarily has a common neutral or ground between source and load, the neutral or ground must be connected to the common terminals of the variable transformer assembly. If the system has no neutral, the load must be balanced or the transformers will be damaged.

OPERATION AT HIGHER FREQUENCIES: All Staco variable transformers are designed for operation at 60 or 50/60 Hz.  Most models can also properly operate with input frequencies to 2000 Hz.  Some models output ratings must be derated at higher frequencies. See derating table for details.

* All 100/200 Series Variable transformers can operate to 2000 Hz without derating the specifications shown above.

Goto Selector for other sizes

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