Overview
The Darrah DEC17ISM-18J is an indirect water-cooled SCR contactor specifically designed for resistance welding operations. Rated for 1100 amps and 1800 volts, this contactor provides reliable switching and current control in high-power welding systems. Built to industrial standards, it delivers the performance and durability required in metalworking, automotive assembly, and other demanding manufacturing applications.
Key Features
- Welding rating of 1100 amps RMS at 50% duty cycle and 600 amps RMS at 100% duty cycle
- 10,000 single-cycle surge current (ITSM) rating
- Water-cooled design requires 1.2 gallons (4.5 liters) per minute cooling flow at 40°C water temperature
- Bus tang type available in both 90° bend configurations
- Integrated thermostat sensor with 70°C open on rise, recloses at 58°C, isolated to 2000 volts
- Fully functional used unit suitable for replacement or backup systems
Technical Specifications
- Continuous Rating: 1100 amps RMS (50% duty cycle)
- 100% Duty Cycle Rating: 600 amps RMS
- Voltage Rating (PIV/VRRM): 1800 volts
- Surge Current (ITSM): 10,000 single cycle
- Water connection: 1/4-18 NPT tapped holes
- Bus Tang Type: Both 90° bend
- Thermostat Range: 70°C open, 58°C reclose
- Thermostat Isolation: 2000 volts
Typical Applications
The DEC17ISM-18J is ideal for:
- Spot welding and seam welding equipment
- Resistance welding power supplies
- Automotive assembly welding systems
- Heavy-duty metalworking and fabrication
- CNC welding and manufacturing operations
- Industrial equipment requiring high-amperage switching control
Compatibility & Replacements
Compatible With
- Darrah Electric resistance welding control systems
- Industrial AC/DC welding power supplies
- Custom resistance welding assemblies
- Water-cooled contactor mounting plates and busses
Replaces / Drop-In Replacement For
- Verify compatibility with your system integrator or Darrah Electric technical support (216-631-0912) before ordering, as direct replacements depend on specific voltage and amperage requirements of your equipment.
Works With
- Indirect water-cooling systems (requires 1.2 gallons/minute flow)
- Standard SCR welding control circuits
- Thermostat-based thermal monitoring
- Bus tang power distribution systems
