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Direct Water Cooled
Undoubtedly the most popular resistance welding contactors for the past thirty years are Darrah's Direct Water Cooled SCR Contactors. The selections shown are available in welding current ratings to 6526 Amps RMS at 50% duty cycle, 5144 Amps continuous. Choose between single or double sided cooled, and in SCR voltages to 4200 Volts. This product line is the workhorse in medium to heavy KVA welding controllers. Mounting bases and bus bar connections are similar throughout the series, therefore offering flexibility and conformity from 15 KVA through 1500 KVA designs.
| Darrah Part Number |
Welding Rating Amps RMS at 50% Duty Cycle |
Welding Rating Amps RMS at 100% Duty Cycle |
SCR voltage rating (PIV) (VRRM) |
Water Cooled SGL DBL |
D09ST15J
D09ST18J |
900
900 |
400
400 |
1500
1800 |
X
X |
-
- |
D13DT15J
D13DT18J |
1300
1300 |
695
695 |
1500
1800 |
-
- |
X
X |
D13SE18J
D13SE20J |
1300
1300 |
695
695 |
1800
2000 |
X
X |
-
- |
D18DE18J
D18DE20J |
1800
1800 |
970
970 |
1800
2000 |
-
- |
X
X |
D21DM18J
D21DM20J
D21DM26J |
2100
2100
2100 |
1225
1225
1225 |
1800
2000
2600 |
-
-
- |
X
X
X |
D26DN18J
D26DN20 |
2600
2600 |
1710
1710 |
1800
2000 |
-
- |
X
X |
D32DN18J
D32DN20J
D32DN26J |
3200
3200
3200 |
2075
2075
2075 |
1800
2000
2100 |
-
-
- |
X
X
X |
D40DD18J
D40DD26J |
3996
2230 |
2188
1946 |
1800
2600 |
-
- |
X
X |
| DPH7847-470J |
6526 |
5144 |
2200 |
- |
X |
| Water Requirements |
Amps RMS is achieved with a cooling flow rate of 1.2 gallons (4.5 liters) per minute at 40°C water temperature. The DPH7847-470J requires 1.8 gallons per minute. |
| Water Connections |
All models accept 3/8 inch water connections. The DPH7847-470J accepts ½ inch water connection. |
| Thermostat |
Normally Closed, Opens at 50º C, Supplied as Standard, S15027. |
| MOV |
For MOV add suffix M to part number. |
| Example |
13DT15JM, 1300 Amps RMS, 1500 Volt, with thermostat and MOV. |
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