The present invention disclosure provides a switchboard having a rotating shutter structure. The switchboard having a rotating shutter structure comprises: a switchboard body that is provided with a circuit breaker chamber into which a circuit breaker is inserted, and an open hole formed in the rear surface to expose a conductor part of a bushing assembly to the circuit breaker chamber; a shutter part that is rotatably installed in the switchboard body and opens/closes the open hole by rotating; and an operation unit that is installed in the switchboard body and rotates the shutter part when the circuit breaker is inserted into the circuit breaker chamber.

A system and method are provided for coordinating the installation and removal a motor control center subunit with the power connection and interruption thereof. A system of interlocks and indicators causes an operator to install a motor control center subunit into a motor control center, and connect supply and control power thereto, in a particular order. Embodiments of the invention may prevent actuation of line contacts of the bucket, and shield the line contacts, until the bucket is fully installed in the motor control center. Other embodiments also prevent circuit breaker closure until the line contacts are engaged with a bus of the motor control center.

A distribution board shield. The distribution board shield includes a drape formed of an elongated non-conductive material having a top end, a bottom end, a rear surface and a front surface. A connector is used to attach the drape within a distribution panel box so that the drape covers exposed bar buses, breaker busses and wires within the working area.

A distribution board shield. The distribution board shield includes a drape formed of an elongated non-conductive material having a top end, a bottom end, a rear surface and a front surface. A connector is used to attach the drape within a distribution panel box so that the drape covers exposed bar buses, breaker busses and wires within the working area.

A safety shutter of the present disclosure comprises: a base unit; a shutter unit; and a cam unit. The base unit is coupled to a cradle of an air circuit breaker, and a terminal connected to a main circuit passes through the base unit. The shutter unit is coupled to the base unit so as to be spaced apart at a predetermined interval, and accommodates the terminal in the space between the shutter unit and the base unit. The cam unit extends from the base unit and penetrates the shutter unit. The shutter unit deactivates insulation by exposing the terminal in the direction of the air circuit breaker when the air circuit breaker is inserted in the direction of the base unit.

Motor control centers have units or buckets with an extendable/retractable power connection (stab) assembly and one or more operating lever interlocks that include a unit latch to latch to a cabinet and a power connection position interlock that blocks the handle of the units or buckets based on position of the power connection assembly, optionally also including a shutter cam that slides a shutter right and left.

Motor control centers have units or buckets with an extendable/retractable power connection (stab) assembly and one or more operating lever interlocks that include a unit latch to latch to a cabinet and a power connection position interlock that blocks the handle of the units or buckets based on position of the power connection assembly, optionally also including a shutter cam that slides a shutter right and left.

A shutter interlock device for an electrical enclosure includes a shutter link defining a lock slot, an actuating member rotatably coupled to the electrical enclosure, and a sliding link. The sliding link includes a first end coupled to the actuating member, a second end opposite the first end, and a pin coupled to the second end, where a rotation of the actuating member causes the pin to selectively disengage the lock slot.

A shutter interlock device for an electrical enclosure includes a shutter link defining a lock slot, an actuating member rotatably coupled to the electrical enclosure, and a sliding link. The sliding link includes a first end coupled to the actuating member, a second end opposite the first end, and a pin coupled to the second end, where a rotation of the actuating member causes the pin to selectively disengage the lock slot.

A passive arc control system for a motor control center 60 includes an arc attenuating box having sides separating adjacent vertical bus bar phases 54, providing a physical barrier to arc flash energy. The box is open at its top and bottom forming a chimney 55. A shutter assembly for each box includes an insulator cap 62 on a free end of the bus bar and an independently moveable, box-shaped shutter 64 that slides along the bus bar away from the insulator cap, when a device is connected to the bus bar. The shutter has an opening 65 through which the bus bar passes when the device is connected to the bus bar and an opening 55′ aligned with the box's chimney. The arc control system provides a high degree of arc protection for personnel working around open motor control centers and is highly modular and easy to construct.