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Staco Variable Transformer 100/200 Series

These manually operated panel mounted Variacs are available in single and three phase models from 0.8 to 3.0 amperes. The 171, 201, 221-B and 291 units operate from 120 volt input, while the 252 unit operates from a 240 volt input. STACO’s coil tapping arrangement permits an output voltage from 0 to line voltage in either the clockwise or counterclockwise direction and from 0 to 10% above line voltage in the clockwise direction. Two and three ganged, manually operated units are available for increased single phase voltage ratings and for three phase applications.

See Important Notes at the end of the page.

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100-200 Series Variable Transformer3 Ganged variable Transformer

1 & 3 Ganged 100-200 Series Variac

Staco 100, 200 Series Wiring - Click to Enlarge

Click Drawings to Enlarge

 

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

request.jpg (10520 bytes)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.

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

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