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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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Technical Data & Calculators

Staco Variable Transformer 2510 and 2520 Series

Motor-driven variable transformer models are available in single, two, or three ganged assemblies in cased or uncased styles as identified by the prefix "M" in the part number. If a motor driven model is ordered, be sure to prefix the part number with the desired travel time from 0 to maximum of 5, 15, 30 or 60 seconds.   The synchronous motor is designed for operation on 120 volts, 50/60 Hertz, single phase lines and draws approximately 0.3 amperes.

Portable models with case, cord, receptacle, switch, light and fuse are available.  Goto Portable Variable Transformer Page for details.

Goto Variable Transformer Selector for other sizes

	Single Open Construcion
	Single Motorized (Open Construction) Version

2500 Series Variac Drawings     

120V Single Phase Input with up to 140V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
2510	M2510	120	1 PH	50/60	0-120	25A	30A	Add 'CT' Suffix for Cased version
					0-140	25A
2510-2	M2510-2	120	1 PH	50/60	0-120	50A	60A	2-Ganged Unit, 1 52LAC Chokes Required; Add 'CT' Suffix for Cased version
					0-140	50A
2510-3	M2510-3	120	1 PH	50/60	0-120	75A	90A	3-Ganged Unit, 3 52LAC Chokes Required; Add 'CT' Suffix for Cased version
					0-140	75A

240V Single Phase Input with up to 280V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
2520	M2520	240	1 PH	50/60	0-240	10A	13	Add 'CT' Suffix for Cased version
					0-280	10A
3PN2520B		240	1 PH	50/60	0-280	10A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle
2520-2	M2520-2	240	1 PH	50/60	0-240	20A	26A	2-Ganged Unit, 1 52LAC Chokes Required; Add 'CT' Suffix for Cased version
					0-280	20A
2510-2	M2510-2	240	1 PH	50/60	0-240	25A	30A	2-Ganged Unit, Add 'CT' Suffix for Cased version
					0-280	25A
2520-3	M2520-3	240	1 PH	50/60	0-240	30A	39A	3-Ganged Unit, 3 52LAC Chokes Required; Add 'CT' Suffix for Cased version
					0-280	30A

480V Single Phase Input with up to 560V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
2520-2	M2520-2	480	1 PH	50/60	0-480	10A	13A	2-Ganged Unit; Add 'CT' Suffix for Cased version
					0-560	10A

Single Phase Voltage Doublers 120V Input 0-280V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Current Rating to 150V	Current Rating at 215V	Current Rating at 280V	Features
2520	M2520	120	1 PH	50/60	0-280	10A	5.7A	4.4A	Add 'CT' Suffix for Cased version
3PN2520B-MOD		120	1 PH	50/60	0-280	10A	5.7A	4.4A	Case, Cord, Plug, Switch, Light, Fuse, Receptacle
2520-2	M2520-2	120	1 PH	50/60	0-280	20A	11.4A	8.8A	2-Ganged Unit, 1 52LAC Chokes Required; Add 'CT' Suffix for Cased version
2520-3	M2520-3	120	1 PH	50/60	0-280	30A	17.1A	13.2A	3-Ganged Unit, 3 52LAC Chokes Required; Add 'CT' Suffix for Cased version

Single Phase Voltage Doublers 240V Input 0-560V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Current Rating to 300V	Current Rating at 430V	Current Rating at 560V	Features
2520-2	M2520-2	240	1 PH	50/60	0-560	10A	5.7A	4.4A	2-Ganged Unit, Add 'CT' Suffix for Cased version

240V Three Phase Wye Input with up to 280V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
2510-3	M2510-3	240	3 PH	50/60	0-240	25A	30A	3-Ganged Unit, Add 'CT' Suffix for Cased version
				60	0-280	25A

480V Three Phase Input 0-480/560V Output

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
2520-3	M2520-3	480	3 PH	50/60	0-480	10A	13A	3-Ganged Unit; Add 'CT' Suffix for Cased version
				60	0-560	10A

Three Phase Wye Phase Voltage Doublers 240V Input 0-560V Outputs

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz	Output Volts	Current Rating to 300V	Current Rating at 430V	Current Rating at 560V	Features
2520-3	M2520-3	240	3 PH	60	0-560	10A	5.7A	4.4A	3-Ganged Unit, Add 'CT' Suffix for Cased version

2500 Series Variac Drawings     

Click on this link to request further variable transformer information

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.

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