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Staco Variable Transformer 500 Series (Ganged & Motorized)

Motor driven variable transformers are available and identified by the prefix "M" in the type number. The synchronous motor is designed for operation on 120 volt, 50/60 Hertz single phase lines and draws approximately 0.3 amperes. If a motor driven variable transformer 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.

500 Series Variac Drawings  

* All 500 Series Variable transformers can operate to 2000 Hz without derating the specifications shown below.

Manually Operated P/N	Motor Driven P/N	Input Volts	Phase	Hertz *	Output Volts	Constant Current Rating	Constant Impedance Rating	Features
501C	M501C	120	1 PH	50/60	0-120	5.0A	7.0A
					0-140	5.0A
501C-2	M501C-2	240	1 PH	50/60	0-240	5A	7.0A	2-Ganged Unit
					0-280	5A
501C-3	M501C-3	240	3 PH	50/60	0-240	5A	7.0A	3-Ganged Unit
				60	0-280	5A

500 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.

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