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Terasaki XS100ns XS Series air circuit breakers marine power systems

Terasaki XS100ns XS Series air circuit breakers marine power systems

  • Product Item : XS100ns
  • Product Brand : Terasaki
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Here is a detailed breakdown of the Terasaki XS100ns and its role in marine electrical systems.

Overview: Terasaki XS100ns

The model name "XS100ns" decodes as follows:

XS: Series name.

100: The frame size, indicating a rated current of up to 1000 Amps.

ns: This suffix is key. In Terasaki's nomenclature, "n" typically denotes a Normal or standard breaking capacity, while the "s" can indicate a specific design or that it's part of the standard performance range. The "ns" model sits between the "ss" and "hs" in terms of its breaking capacity. It offers a high, but not ultra-high, breaking capacity, making it a versatile and common choice for many applications.

Key Specifications (Typical for XS100ns):

Rated Current (Iu): Up to 1000A.

Rated Operational Voltage (Ue): Typically 690V AC.

Breaking Capacity (Icu): High, but generally lower than the "hs" version. A typical value might be in the range of 65kA to 85kA at 415V. This is sufficient for a vast majority of feeder and distribution points.

Tripping Unit: Features a standard Electronic Trip Unit (ETU) with fully adjustable protection settings for overload (L), short-circuit (S), instantaneous (I), and ground fault (G).

Application in Marine Power Systems

The XS100ns is the workhorse for major feeder circuits. It is designed for points in the electrical distribution where the available fault current is significant, but not at the absolute maximum levels found right at the main generator outputs.

Its primary roles are:

Primary Feeder Protection:

It is the ideal breaker for supplying power from the Main Switchboard (MSB) to large, critical loads.

Key Examples:

Bow Thruster & Stern Thruster Supply: This is a classic application. The XS100ns provides the high-current feed and robust short-circuit protection required for these massive motors.

Large Pump Motors: For fire pumps, ballast pumps, and main cooling water pumps.

HVAC Plant Main Feed: Supplying the central chilling plant.

Main Switchboard to Power Panel Feeder: Acting as the incoming breaker for a large power distribution panel that serves an entire section of the ship.

Sub-Switchboard Incoming Breaker:

It is perfectly suited to be the main incoming breaker for a large sub-switchboard (e.g., an Engine Room Sub-Switchboard). Its breaking capacity is high enough to handle the fault current available at that point in the system.

Why the XS100ns is a Popular Choice

Optimal Balance of Performance and Cost:

The "ns" offers a high level of performance without the potential over-specification of the more expensive "hs" model. For many feeder applications, the breaking capacity of the "ns" is perfectly adequate and is the most cost-effective solution.

Full Selective Coordination:

Like all XS breakers, its ETU is fully adjustable. This allows system designers to set the Long-Time, Short-Time, and Instantaneous pickups and delays to ensure selective coordination with both upstream (e.g., a larger XS250ns) and downstream (MCCBs) breakers.

Marine-Grade Durability:

It is built to the same rugged standards as the rest of the series, with corrosion-resistant coatings and construction that meets the requirements of marine classification societies (Lloyd's, DNV, ABS, etc.), ensuring reliability in harsh environments.