GPSS 4 400 AMP AC/DC Portable VRD
The SafeTac External Portable GPSS4 (400 AMP) is designed for welders operating between 100 and 400 Amps AC/DC. Built from durable stainless steel and fully tested to N.A.T.A. standards, it delivers reliable performance, enhanced safety, and long-term durability without affecting welding machine duty cycle or weld characteristics.
Key Features
- Suits welders 100 to 400 AMP AC/DC
- Input volts 20 to 130 Volts AC/DC + reverse polarity DC
- Rated at 400 Amps at 100% duty cycle
- 1 metre 95mm² input and output cables
- Fitted with 500 Amp mech connectors
- Constructed from 304 stainless steel
- “O”-Ring LED seals
- “O”-Ring sealed chromed brass cable glands
- Turn off resistance 20 to 150 Ohms / Turn on greater than 200 Ohms
- VRD turn on time 0.3 seconds, programmable to 5 seconds
- Reduced output volts approximately 12 VDC
- Warranty 1 Year RTB
- N.A.T.A. tested
- Can be permanently mounted using 8mm tamperproof bolts
- No effect on welding machines duty cycle or weld characteristics
- Built-in fail alarm test (visual, audible upon request)



