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Solid State Ignitron Tube Replacements

Darrah provides a complete line of Solid State SCR Ignitron Tube Replacements. Replacements are available in both water cooled and air cooled designs, and easily mount on existing Ignitron Tube brackets.

Darrah's replacements are engineered so that no modifications are required to existing controls or timer. All wiring and assembly is complete and Darrah Ignitron Tube Replacements are supplied with MOV and normally closed thermostat.

Installation instructions are provided upon request.

Water cooled - DHE Series

Ignitron Size	Darrah Part #	Welding Transformer Size	Welding Rating Amps RMS at 5% duty cycle	SGL Cycle Surge Current (ITSM)	SCR Voltage Rating (PIV) (VRRM)
A/B	DHE800-22M DHE1200-22M	100KVA 200KVA	1300 1700	7500 9000	2200 2200
J/C D	DHE1500-22M DHE1700-22M	300KVA 550KVA	1800 2300	11200 11200	2200 2200
D/E E	DHE2500-22M DHE3300-22M	650KVA 750KVA	2600 3200	16400 21000	2200 2200
Super E	DHE7847-22M	1500KVA	6526	40000	2200

Air Cooled -DAHE Series

Ignitron Size	Darrah Part #	Welding Transformer Size	Welding Rating Amps RMS at 5% duty cycle	SGL Cycle Surge Current (ITSM)	SCR Voltage Rating (PIV) (VRRM)
A/B	DAHE180-22M	125KVA	1540	7500	2200
C	DAHE195-22M	250KVA	1810	9000	2200
D/E	DAHE055-22M	500KVA	2630	16400	2200

Darrah now offers a complete line of Air Cooled Solid State Mechanical Contactor Replacements for welding controls thru 60 KVA. These compact replacements feature encapsulated modules mounted on air cooled heat sink extrusions. Each heat sink is cut 4- 1/2 inches long, machined, and have a gold irridite finish. These replacements are completely assembled and tested prior to shipping.

Darrah's mechanical contactor replacements easily wire into existing circuits and are operated by external contact closure.


Extrusion #5731 / 4.5" long

Darrah Part Number	Welding Rating Amps RMS at various duty cycles				SCR Voltage	Suggested Maximum Transformer KVA (2)
	10%	20%	50%	100%		230 Line Volts	460 Line Volts
CMB175-12 CMB175-16	310 310	205 205	115 115	60 60	1200 1600	20 -	- 40
CMB275-12 CMB275-18	450 450	275 275	140 140	70 70	1200 1800	25 -	- 50
CMB300-12 CMB300-12	500 500	330 330	160 160	75 75	1200 1600	30 -	- 60