PDUs with thermal magnetic circuit breakers are advantageous in handling surges of current for both large and small over-currents i.e. short circuits. The electromagnet responds instantaneously to large surges in current to prevent severe damage to expensive and crucial IT infrastructure. Whereas the bimetallic strip are designed to respond to smaller, longer-term over-currents. This clever combination of over-current protection by Thermal Magnetic Circuit Breakers is ideal in server cabinets.