The coil is fully potted with resin to prevent dust, oil, grease, liquids, vapour and mud ingress. In an energised state, electro-holding magnets hold ferromagnetic workpieces. When de-energised, the workpiece disengages. The holding system works with a low operating current and is maintenance-free. There are nine bar lengths, the largest achieves up to 10400N of holding force. Holding forces depend on the associated parts, such as mating material, minimum material thickness and diameter and zero air gap with a smooth surface. The standard voltage/duty cycle is 24V DC / 100% ED with a screw connection gland orientated to the bottom or side of the electro-holding magnet.