Indirect Water Cooled


Darrah offers the resistance welding industry our line of Indirect Water Cooled contactors.

Indirect water cooled contactors isolate the high voltage A.C. from the cooling water. Indirect contactors can be mounted directly to the side of the control cabinet therefore eliminating the need for lengthy hoses in your enclosures.

Darrah provides the open SCR and the encapsulated module designs in indirect water cooled.

The open SCR type, DEC 12, DEC 14, and DEC17 provide easy SCR removal without disconnecting water lines. Three bus bar configurations are provided.

Open SCR Designs

Open SCR Designs

Darrah Part Number Welding Rating Amps RMS at 50% Duty Cycle Welding Rating Amps RMS at 100% Duty Cycle SGL. Cycle Surge Current (ITSM) SCR Voltage Rating (PIV) (VRRM) Bus Tang Type
DEC12ISM18-J 1100 600 10000 1800 STRAIGHT
DEC14ISM-18J 1100 600 10000 1800 1 Straight,
1 90° bend
DEC17ISM-18J 1100 600 10000 1800 both 90° bend

Darrah module designs are smaller with increased current capacity. Three current ratings are available.

Encapsulated Module Designs

Encapsulated Module Designs
Darrah Part Number Welding Rating Amps RMS at 10% Duty Cycle Welding Rating Amps RMS at 50% Duty Cycle Welding Rating Amps RMS at 100% Duty Cycle SCR Voltage Rating (PIV) (VRRM) Water Connection Location
Q20001 1592 1278 717 1800V Side
1-1/2' Centers
Q20002 1592 1278 717 1800V Bottom
1-1/2' Centers
Q20003 1592 1278 717 1800V Side
2" Centers
Q20005 1592 1278 717 1800V Side
1-1/2' Centers
Q20008 1068 755 450 1800V Side
2" Centers
Q20011 2797 1522 1097 1800V Side
1-1/2' Centers
Q20012 2797 1522 1097 1800V Bottom
1-1/2' Centers
Q20013 2797 1522 1097 1800V Side
2" Centers

Water Requirements Amps RMS is achieved with a cooling flow rate of 1.2 gallons (4.5 liters) per minute at 40ºC water temperature.
Water Connection ¼-18NPT tapped holes.
Thermostat All modules are supplied with an accelerated thermostat sensor, 50°C open on rise and isolated to base 2000 Volts. Thermostat leads are 24 inches long.
Options include R/C Snubber, MOV's and bus bars.
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