The Miller Dialarc 250 HF is a professional-grade, constant-current AC/DC arc and TIG (GTAW) welding power source. It is recognized for its heavy-duty magnetic amplifier technology and integrated high-frequency (HF) capabilities for TIG welding applications.
Miller Welding
Miller Welding
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Key Performance Specifications
Rated Output: 250 Amperes, 30 Volts at a 40% Duty Cycle.
Secondary Amperage Range: 10–310 Amps for both AC and DC.
Maximum Open-Circuit Voltage (OCV): Approximately 75–76 Volts.
Welding Processes: Primary focus on Gas Tungsten Arc Welding (TIG/GTAW) and Shielded Metal Arc Welding (Stick/SMAW).
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Miller Welding
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Input Power Requirements
Phase: Single-phase only.
Voltage Options: Typically 200/230/460 Volts or 230/460/575 Volts (model dependent).
Input Amperage at Rated Output:
230V: 90 Amps.
460V: 45 Amps.
575V: 36 Amps.
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Miller Welding
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Physical Dimensions and Weight
Net Weight: Approximately 560 lbs (254 kg).
Standard Dimensions: Roughly 26" Height x 19" Width x 33" Depth. Larger shipping footprints of 60" L x 48" W x 56" H may be cited for freight.
The Equipment Hub
The Equipment Hub
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Specialized Features
High Frequency Control: Features a dedicated HF switch for start-only or continuous modes, essential for TIG welding aluminum on AC.
Thermal Protection: Includes built-in overload and thermal protection to prevent damage during high-output operation.
Cooling: Equipped with a forced-draft cooling fan to maintain internal temperatures.
Controls: Includes single-dial current control with high and low range selectors.
Miller Welding
Miller Welding
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For detailed wiring and maintenance, you can reference the Miller Dialarc HF Owner's Manual provided by Miller Welding.