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| PartNumber | M5021E-4PS | M5021E-3P | M5021E-3Y |
| Description | Industrial Control Transformers 0-480/560V out 56A 480/240Vin Single | Industrial Control Transformers 0-240/280V out 84A 240/120Vin Single | Industrial Control Transformers 0-480/560V out 28A 480/240Vin 3-Phase |
| Manufacturer | Staco | Staco | Staco |
| Product Category | Industrial Equipment | Industrial Equipment | Industrial Equipment |
| Series | 5000 | 5000 | 5000 |
| Product | Industrial Control Transformers | Industrial Control Transformers | Industrial Control Transformers |
| Type | Variable Transformers | Variable Transformers | Variable Transformers |
| Unit Weight | 368 lbs | 263 lbs | 263 lbs |
| Mounting Style | Chassis | Chassis | Chassis |
| Height | 552.4 mm | 552.5 mm | 552.4 mm |
| Length | 1333.5 mm | 850.9 mm | 850.9 mm |
| Width | 565.8 mm | 565.8 mm | 565.8 mm |
| Power Rating | 13.5 kV 26.9 kV 31.4 kV | 10.2 kV 20.2 kV 23.5 kV | 11.8 kV 23.3 kV 23.3 kV |
| Primary Voltage Rating | 240 V 480 V | 120 V 240 V | 240 V 480 V |
| Secondary Voltage Rating | 0 V to 480 V/560 V 0 V to 560 V | 0 V to 240 V/280 V 0 V to 280 V | 0 V to 480 V/560 V 0 V to 560 V |
| Secondary Current Rating | 56 A | 84 A | 28 A |
| Operating Frequency | 50 Hz/60 Hz | 50 Hz/60 Hz | 50 Hz/60 Hz |