The 100-D420EG11 contactor is a 420 Amps rated IEC contactor. It is designed by Allen-Bradley and it belongs to the Bulletin 100-D series of large industrial contactors. Two auxiliary contacts with IP 20 protection rating are available on the contactor. One of the auxiliary contacts is a normally closed contact and the other is a normally open contact. The control coil in the contactor works at 200 Volts AC voltage and 50/60 Hertz frequency. The control coil has a built-in electronic interface. Allen-Bradley recommends that the installation and maintenance of the 100-D420EG11 contactor only be carried out by qualified technicians. The operating instructions and safety instructions must be read, understood, and implemented properly by the technicians. Failure to follow all of the recommended safety instructions can have catastrophic consequences such as equipment damage and user injury.

The presence of dangerous electric voltage requires that the Allen-Bradley 100-D420EG11 Bulletin 100-D contactor be shut off before any work on it is commenced. The main contacts and the arc chute on the 100-D420EG11 contactor must be examined after every short circuit. If the arch chute is removed, the contactor becomes mechanically locked. When the coil on the contactor is energized, the arc chute becomes mechanically locked. If a short circuit leads to contact welding, the arc chute can be removed by exerting more force. Slight contact welds can be removed carefully with a screwdriver. Care must be taken not to bend the contacts. The main contacts on the 100-D420EG11 contactor, the magnet coil, and the arc chute can be replaced if required. Only original Allen-Bradley brand spare parts should be used to ensure device reliability.