Overview
The Staco Energy Products 501C is a versatile variable auto transformer designed for applications requiring precise AC voltage control from zero to line voltage or above. With a 5A current rating, this panel-mount unit combines versatility, compactness, and durability. Rated at 0.7KVA for constant-current loads, the 501C is widely used in industrial control, equipment testing, laboratory voltage supplies, and general-purpose AC regulation applications.
Key Features
- Operates from 120V input with 5A constant current rating and 7A capability for constant impedance loads
- Coil tapping arrangement permits output voltage from 0 to line voltage or 17% above line voltage under constant current conditions
- Faston® terminals easily converted to screw connections with supplied terminal adapter kits
- Can be operated from 50 to 2000Hz without derating
- Offers clockwise and counter-clockwise shaft rotation for voltage increase
- Supports both single-point and four-point mounting configurations
Technical Specifications
- Input Voltage: 120VAC, 50–60Hz
- Output Voltage: 0–120V or 0–140V (17% boost capability)
- Constant Current Rating: 5A @ 0.7KVA
- Constant Impedance Rating: 7A
- Frequency Range: 50–2000Hz (without derating)
- Mounting: Panel mount
- Terminal Type: Faston® (adaptable to screw terminals)
- Shaft Rotation: Clockwise / Counter-clockwise
- Dimensions: 4.160″ L × 3.940″ W × 2.380″ H (105.66mm × 100.08mm × 60.45mm)
- Phase: Single phase
- RoHS Compliant: Yes
Typical Applications
- Industrial voltage regulation and equipment startup testing
- Laboratory bench-top AC voltage control and power supply simulation
- Electronic equipment troubleshooting and burn-in testing
- AC motor soft-start and speed control
- Lighting dimming and heating load control
- OEM integration in control panels
Compatibility & Replacements
Compatible With
- Standard 120VAC single-phase power distribution panels
- Industrial test benches and laboratory equipment
- Equipment requiring variable AC voltage 0–140V
- Panel-mounted control systems supporting Faston® or screw terminal connections
Replaces / Drop-In Replacement For
- Earlier Staco Energy Products 501 (non-C) models in panel-mount configurations
- Compatible as a replacement in existing 120V, 5A variable transformer applications
- Verify voltage, mounting, and terminal type compatibility with your system before ordering
Works With
- Manual hand-crank operation or retrofit with optional motor drive (designated by “M” prefix, e.g., M501C)
- Staco Energy microprocessor MP-series interfaces for automated voltage control
- Standard industrial three-phase configurations via ganged multi-unit shaft coupling
- Equipment supporting standard Faston® quick-disconnect and screw-terminal wiring
