Variac Variable Transformers
 

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Staco VARIAC Variable Transformer 2510 and 2520 Series

The 2510/2520 Series Variable Transformers represent a compact high current variable transformer design. The 2510, 120 volt variable transformer coil is rated at 25 amperes for constant current loads; while the 2520, 240 volt variable transformer coil is rated at 10 amperes for constant current loads. Constant impedance ratings are listed in the specifications. They can be operated at frequencies between 50 and 2000 Hertz with derating at higher than rated frequency (See Table for frequency derating).

Uncased variable transformer 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 are available in either "C" style (featuring protective screening over the coil assembly only) or the "CT" style (which also includes a terminal box cover with knock-outs to accept conduit).

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

 

st2500_3gang_img.jpg (7892 bytes) st2500_open_single_img.jpg (5906 bytes)Single Open Construcion
st2500_m_open_single_img.jpg (5119 bytes)Single Motorized (Open Construction) Version
Staco 2510 and 2520 VARIAC
Staco 2510CT and 2520CT
Staco 2510-2, 2520-2, 2510-3 and 2520-3 VARIAC Staco 2510CT-2, 2520CT-2, 2510CT-3 and 2520CT-3
Staco M2510CT, M2520CT, M2510CT-2, M2520CT-2, M2510CT-3 and M2520CT-3 VARIAC Staco M2510, M2520, M2510-2, M2520-2, M2510-3 and M2520-3 VARIAC
Staco 2500 Series Coil Wiring

2500 Series Variac Drawings     

IMPORTANT NOTES About VARIAC Current Ratings

120V Single Phase Input with up to 140V Outputs

Part Number Input Volts PH HZ Output Volts

Constant Current/ Constant Impedance* Rating

Features  
2510 120 1 50 / 60 0-120 25A/ 30A* Add 'CT' Suffix for Cased version
M2510 (Motorized) 0-140 25A
2510-2 120 1 50 / 60 0-120 50A/ 60A* 2-Ganged Unit, 1 52LAC Chokes Required; Add 'CT' Suffix for Cased version
M2510-2 (Motorized) 0-140 50A
2510-3 120 1 50 / 60 0-120 75A/ 90A* 3-Ganged Unit, 3 52LAC Chokes Required; Add 'CT' Suffix for Cased version
M2510-3 (Motorized) 0-140 75A

 

240V Single Phase Input with up to 280V Outputs

Part Number Input Volts PH HZ Output Volts

Constant Current/ Constant Impedance* Rating

Features  
2520 240 1 50 / 60 0-240 10A/ 13A* Add 'CT' Suffix for Cased version
M2520 (Motorized) 0-280 10A
3PN2520B 240 1 50 / 60 0-280 10A Case, Cord, Plug, Switch, Light, Fuse, Receptacle
2520-2 240 1 50 / 60 0-240 20A/ 26A* 2-Ganged Unit, 1 52LAC Chokes Required; Add 'CT' Suffix for Cased version
M2520-2 (Motorized) 0-280 20A
2510-2 240 1 50 / 60 0-240 25A/ 30A* 2-Ganged Unit, Add 'CT' Suffix for Cased version
M2510-2 (Motorized) 0-280 25A
2520-3 240 1 50 / 60 0-240 30A/ 39A* 3-Ganged Unit, 3 52LAC Chokes Required; Add 'CT' Suffix for Cased version
M2520-3 (Motorized) 0-280 30A

 

480V Single Phase Input with up to 560V Outputs

Part Number Input Volts PH HZ Output Volts

Constant Current/ Constant Impedance* Rating

Features  
2520-2 480 1 50 / 60 0-480 10A/ 13A* 2-Ganged Unit; Add 'CT' Suffix for Cased version
M2520-2 (Motorized) 0-560 10A

 

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

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

 

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

Part Number Input Volts PH HZ Output Volts Current Rating to 300V Current Rating at 430V Current Rating at 560V Features  
2520-2 240 1 50 / 60 0-560 10A 5.7A 4.4A 2-Ganged Unit, Add 'CT' Suffix for Cased version
M2520-2 (Motorized)

 

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

Part Number Input Volts PH HZ Output Volts

Constant Current/ Constant Impedance* Rating

Features  
2510-3 240 3 50 / 60 0-240 25A/ 30A* 3-Ganged Unit, Add 'CT' Suffix for Cased version
M2510-3 (Motorized) 60 0-280 25A

 

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

Part Number Input Volts PH HZ Output Volts

Constant Current/ Constant Impedance* Rating

Features  
2520-3 480 3 50 / 60 0-480 10A/ 13A* 3-Ganged Unit; Add 'CT' Suffix for Cased version
M2520-3 (Motorized) 60 0-560 10A

 

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

Part Number Input Volts PH HZ Output Volts Current Rating to 300V Current Rating at 430V Current Rating at 560V Features  
2520-3 240 3 60 0-560 10A 5.7A 4.4A 3-Ganged Unit, Add 'CT' Suffix for Cased version
M2520-3 (Motorized)

2500 Series Variac Drawings     

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Cleveland, OH  44133 USA
Tel: 440-237-3200 - Fax 440-237-1744
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