Load banks and crowbar resistors
Load Banks are used for testing equipment such as (emergency) generators and UPS systems or also dummy loads to maintain the generator at the minimum temperature. Load banks are offered from a few kW up to 10MW and from working voltages of a few hundred volts up to 36kV. Load banks are built from several steel-grid building-blocks making it easy to split up the load bank into (many) smaller loads. Load banks are made for both indoor and outdoor use in IP classes up to IP23. Higher IP ratings are problematic as it becomes more difficult to dissipate heat.
Crowbar resistors are used to suppress transient or short-duration voltage peaks in traction and industrial applications. Crowbar resistors are designed to handle high power loads for limited periods.