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 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 1000 and 1200 Series

Staco 1210B variable transformer coil operates on 120 volts and is rated for constant current of 12 amperes. The 1220B variable transformer coil operates on  240 volts and has a constant current rating of up to 5 amperes. Both variable transformer types include coil tapping arrangements allow for 0 to input line voltage or 17% above line voltage.  

All these variable transformers may be operated from 50-1500 hertz with no reduction in output current.

Uncased models have the shaft extending from the base end. This shaft is fully adjustable and can be extended from either end for general utility mounting. Cased styles, which have a "CT" suffix, feature the protective cover over the coil assembly and a terminal box cover with knock-outs to accept conduit.

Motor driven variable transformer units are available in single, two and three ganged variable transformer assemblies; cased or uncased styles as identified by the prefix "M" in the type number. If a motor driven model is ordered, be sure to prefix the part number with the desired travel time from (0 to maximum output) 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 Selector for other sizes

Open Style	Cased "CT" Version		Motorized Version
1010 Wiring		1020/1220 Wiring

1000 Series Variac Drawings   1200 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
1010B	M1010B	120	1 PH	50/60	0-120	10A	13A	Add 'CT' Suffix for Cased version
					0-140	10A
3PN1010B		120	1 PH	50/60	0-140	10A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle
1210B	M1210B	120	1 PH	60	0-120	12A	15A	Add 'CT' Suffix for Cased version
3PN1210B		120	1 PH	50/60	0-120	12A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle

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
1020B	M1020B	240	1 PH	50/60	0-240	3.5A	5.0A	Add 'CT' Suffix for Cased version
					0-280	3.5A
3PN1020B		240	1 PH	50/60	0-280	3.5A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle
1220B	M1220B	240	1 PH	60	0-240	5.0A	7.0A	Add 'CT' Suffix for Cased version
3PN1220B		240	1 PH	60	0-240	5.0A		Case, Cord, Plug, Switch, Light, Fuse, Receptacle

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
1020B-2	M1020B-2	480	1 PH	50/60	0-480	3.5A	5.0A	2-Ganged Unit; Add 'CT' Suffix for Cased version
					0-560	3.5A
1220B-2	M1220B-2	480	1 PH	60	0-480	5.0A	7.0A	2-Ganged Unit; Add 'CT' Suffix for Cased version

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
1020B	M1020B	120	1 PH	50/60	0-280	3.5A	2.0A	1.5A	Add 'CT' Suffix for Cased version
3PN1020B-MOD		120	1 PH	50/60	0-280	3.5A	2.0A	1.5A	Case, Cord, Plug, Switch, Light, Fuse, Receptacle

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
1020B-2	M1020B-2	240	1 PH	50/60	0-560	3.5A	2.0A	1.5A	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
1010B-3	M1010B-3	240	3 PH	50/60	0-240	10A	13A	3-Ganged Unit; Add 'CT' Suffix for Cased version
				60	0-280	10A
1210B-3	M1210B-3	240	3 PH	60	0-240	12A	15A	3-Ganged Unit; Add 'CT' Suffix for Cased version

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
1020B-3	M1020B-3	480	3 PH	50/60	0-480	3.5A	5.0A	3-Ganged Unit; Add 'CT' Suffix for Cased version
				60	0-560	3.5A
1220B-3	M1220B-3	480	3 PH	60	0-480	5.0A	7.0A	3-Ganged Unit; Add 'CT' Suffix for Cased version

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
1020B-3	M1020B-3	240	3 PH	60	0-560	3.5A	2.0A	1.5A	3-Ganged Unit, Add 'CT' Suffix for Cased version

1000 Series Variac Drawings   1200 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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