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 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 1510 and 1520 Series

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 Enclosed "CT" Version
Motorized "M" Open Construction		Type 1510
		Type 1520

 1500 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
1510B	M1510B	120	1 PH	50/60	0-120	15A	20A	Add 'CT' Suffix for Cased version
					0-140	15A
3PN1510B		120	1 PH	50/60	0-140	15A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle
3PN1510B-DVM		120	1 PH	50/60	0-140	15A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle, Digital Voltmeter

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
1520	M1520	240	1 PH	50/60	0-240	9.5A	12.0A	Add 'CT' Suffix for Cased version
					0-280	9.5A
3PN1520B		240	1 PH	50/60	0-280	9.5A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle
3PN1520B-DVM		240	1 PH	50/60	0-280	9.5A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle, Digital Voltmeter
1510-2	M1510-2	240	1 PH	50/60	0-240	15A	20A	Add 'CT' Suffix for Cased version
					0-280	15A

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
1520-2	M1520-2	480	1 PH	50/60	0-480	9.5A	12A	2-Ganged Unit; Add 'CT' Suffix for Cased version
					0-560	9.5A

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
1520	M1520	120	1 PH	50/60	0-280	9.5A	5.4A	4.1A	Add 'CT' Suffix for Cased version
3PN1520B-MOD		120	1 PH	50/60	0-280	9.5A	5.4A	4.1A	Case, Cord, Plug, Switch, Light, Fuse, Receptacle
3PN1520B-XDVM		120	1 PH	50/60	0-280	9.5A	5.4A	4.1A	Case, Cord, Plug, Switch, Light, Fuse, Receptacle, Digital Voltmeter

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
1520-2	M1520-2	240	1 PH	50/60	0-560	9.5A	5.4A	4.1A	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
1510-3	M1510-3	240	3 PH	50/60	0-240	15A	20A	3-Ganged Unit; Add 'CT' Suffix for Cased version
				60	0-280	15A

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
1520-3	M1520-3	480	3 PH	50/60	0-480	9.5A	12A	3-Ganged Unit; Add 'CT' Suffix for Cased version
				60	0-560	9.5A

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
1520-3	M1520-3	240	3 PH	60	0-560	9.5A	5.4A	4.1A	3-Ganged Unit, Add 'CT' Suffix for Cased version

1500 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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