Operating ranges are either narrow or wide angle. Mass. Compact heat exchangers and oil coolers are available in stainless steel, copper, or aluminum. The smallest heat exchanger measures 5.5 by 5.5 by 1.25 in. Ontario AL600 has been designed to test high-current motor controllers. It can source and sink 600 A with up to a 40-V dc supply while only requiring 100 A from the supply.
Current regeneration is fed back into the load under test rather than being dissipated as heat.
An RTS232 connection allows a PC computer interface for setup or control.