Universal Remote Control MX-880Z - SPECS SHEET Informazioni Techniche Scaricare il pdf (Pagina 5)

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Masterpact™ NT and NW Universal Power Circuit Breakers

Masterpact™ Circuit Breakers

05/2014

UL File Numbers:

•

Masterpact NW: E161835 Vol. 2 Sec. 1

•

Masterpact NT: E161835 Vol. 2 Sec. 2

Features and Benefits

High Ampere Interrupting Rating (AIR): ANSI Certified Masterpact NW circuit breakers have an

interrupting rating of 200,000 A at 508 Vac without fuses.

High Short-Time Current Rating: Masterpact NW circuit breakers have exceptional short-time

ratings—up to 100,000 A.

100% Rated Circuit Breaker: Masterpact circuit breakers are designed for continuous operation at

100% of their current rating.

Reverse Fed Circuit Breaker: Masterpact circuit breakers can be fed either from the top of the circuit

breaker or from the bottom.

True Two-Step Stored Energy Mechanism: Masterpact circuit breakers are operated via a stored-

energy mechanism which can be manually or motor charged. The closing time is less than five cycles.

Closing and opening operations can be initiated by remote control or by push buttons on the circuit

breaker front cover. An O–C–O cycle is possible without recharging.

Drawout or Fixed Mount, 3-Pole (3P) or 4-Pole (4P) Construction: ANSI Rated, UL Listed and IEC

Rated Masterpact circuit breakers are available in drawout or fixed mounts, with either 3P or 4P

construction.

Field-Installable Trip Units, Sensor Plugs and Accessories: Trip units, sensor plugs and most

accessories are field installable with only the aid of a screwdriver and without adjusting the circuit

breaker. The uniform design of the circuit breaker line allows most accessories to be common for the

whole line.

Reinforced Insulation: Two insulation barriers separate the circuit breaker front from the current path.

Isolation Function by Positive Indication of Contact Status: The mechanical indicator is truly

representative of the status of all the main contacts.

Segregated Compartment: Once the accessory cover has been removed to provide access to the

accessory compartment, the main contacts remain fully isolated. Furthermore, interphase partitioning

allows full insulation between each pole even if the accessory cover has been removed.

Front Connection of Secondary Circuits: All accessory terminals (ring terminals are available as an

option) are located on a connecting block which is accessible from the front in the connected, test and

disconnected positions. This is particularly useful for field inspection and modification.

Anti-Pumping Feature: All Masterpact NT and NW circuit breakers are designed with an anti-pumping

feature that causes an opening order to always takes priority over a closing order. Specifically, if

opening and closing orders occur simultaneously, the charged mechanism discharges without any

movement of the main contacts keeping the circuit breaker in the open (OFF) position.

In the event that opening and closing orders are simultaneously maintained, the standard mechanism

provides an anti-pumping function which continues to keep the main contacts in the open position.

In addition, after fault tripping or opening the circuit breaker intentionally (using the manual or electrical

controls and with the closing coil continuously energized) the circuit breaker cannot be closed until the

power supply to the closing coil is discontinued and then reactivated.

NOTE: When the automatic reset after fault trip (RAR) option is installed, the automatic control system

must take into account the information supplied by the circuit breaker before issuing a new closing

order or before blocking the circuit breaker in the open position. Information on the type of fault, e.g.

overload, short-circuit or ground fault.

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Universal Remote Control MX-880Z - SPECS SHEET Informazioni Techniche Pagina 5

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