Hobart OM-303 manual Specifications, Duty Cycle Chart, Volt-Ampere Curves, Hertz Models

3-2.		Specifications
A.	60 Hertz Models
	Rated Output at 20%		Welding Amperage Range				Max.				Net
							Open-Circuit
		Duty Cycle	AC High	AC Low		DC	Voltage	Rated Output	KVA	Dimensions	Weight
TIG:		150 A at 15 VDC	TIG Welding A Range				78	200 V–60 A (3.6)*	12.0	H: 18 in (457 mm)	140 lb
(GTAW) 150 A at 15 VAC			50–165	20–50	30–160			230V–52 A (3.0)*	(0.64)*	W: 13 in (330 mm)	(64 kg)
Stick:		130 A at 25 VDC	Stick Welding A Range				78	460 V–33 A (1.5)*		D: 251/2 in (648 mm)
(SMAW) 150 A at 25 VAC			35–165	20–50	25–130
* () While idling.
B.	50 Hertz Models
	Rated Output at 20%		Welding Amperage Range				Max.				Net
							Open-Circuit
		Duty Cycle	AC High	AC Low		DC	Voltage	Rated Output	KVA	Dimensions	Weight
TIG:		150 A at 15 VDC	TIG Welding A Range				78	380 V–39 A (2.0)*	14.8	H: 18 in (457 mm)	140 lb
(GTAW) 150 A at 15 VAC			50–165	20–50	30–160			415V–36 A (1.5)*	(0.64)*	W: 13 in (330 mm)	(64 kg)
Stick:		130 A at 25 VDC	Stick Welding A Range				78			D: 251/2 in (648 mm)
(SMAW) 150 A at 25 VAC			35–165	20–50	25–130

* () While idling.

3-3. Duty Cycle Chart

Duty cycle is percentage of 10 minutes that unit can weld at rated load without overheating.

Y Exceeding duty cycle can damage unit and void warranty.

GTAW: 20% Duty Cycle at 150 A AC/DC

SMAW: 20% Duty Cycle at 130 A DC, or 150 A AC

2 Minutes	8 Minutes
Welding	Resting

ST-157 648-A

3-4. Volt-Ampere Curves

Volt-ampere curves show minimum and maximum voltage and amper- age output capabilities of welding power source. Curves of other set- tings fall between curves shown.

ssb1.1 10/91 – ST-157 625-B / ST-157 626-B

OM-303 Page 11