Staco 2520CT-3 Panel mount, single phase, adjustable shaft Energy Products Group VT-3

The 2510/2520 Series Variable Transformers represent a compact

high current variable transformer design. The 2510, 120

volt unit is rated at 25 amperes for constant current loads; while

the 2520, 240 volt unit 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.

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 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 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.

Example: 5M2510CT. The synchronous motor is designed for

operation on 120 volts, 50/60 Hertz, single phase lines and

draws approximately 0.3 amperes.

• Jumper provided in the standard common position and should be moved or removed as

required.

++ Line to line voltage

‡ Unit is fused for the constant current rating at the factory.

+ Motor driven units use terminal connections for CCW increasing voltage, as viewed from

the base end. See Figure 23 on page 9 for motor wiring.

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.

# Maximum output current in output voltage range from 0 to 25% above line voltage. At higher

output voltages, the output current must be reduced according to the derating curve,

Figure B, page 6.

§ Maximum KVA at maximum output voltage and corresponding derated output current.

Maximum KVA for lower voltages may be calculated from derating curve Figure B, page 6