Schneider Electric Masterpact NT16 H2 Circuit Breaker 338857 Drawout

Schneider Electric Masterpact NT16 H2 Circuit Breaker 338857 Drawout NS-NT06-16

The Schneider Electric Masterpact NT16 H2 (MPN: 338857) is a space-saving, high performance Air Circuit Breaker (ACB) for the complete protection and isolation of low-voltage electrical networks. The compact NS-NT06-16 frame style drawout type system provides reliable power distribution protection in extreme ambient circumstances and is an excellent solution for main switchboards of commercial boats, offshore platforms and large industrial facilities.

This setup shows a very accurate Micrologic 2.0 A trip unit with electronic overload and short-circuit protection, an MCH motorized spring-charging mechanism (200-240 VAC), an XF closure release (200-250 VAC/VDC) and an MN undervoltage release (200-250 VAC/VDC). The drawout execution enables for fast and safe removal of the chassis for maintenance without the need to separate major busbars, which considerably reduces the mean time to repair (MTTR) in essential marine main bus systems.

Model Details:

• Manufacturer: Schneider Electric / Merlin Gerin
• Model Name / Range: Masterpact NT16 H2
• Manufacturer Part Number (MPN): 338857
• Alternative Frame Reference: 47241
• Chassis Architecture / Frame Size: NS-NT06-16 / Masterpact NT Frame

Technical Specifications: Schneider Electric Masterpact NT16 H2

Features

1. Superior Motorized Accessories: Factory installed with an MCH spring-charging motor (200-240 VAC) with XF/MN remote trip and closure coils for completely automated switchboard power management and black-start synchronization.
2. Micrologic 2.0 A Control Unit True RMS protection against overloads and short-circuits Adjustable thresholds with precision ammeter capabilities (A)
3. Ruggedized Drawout Operation: Allows quick unit withdrawal to isolated or test positions while preserving complete internal IP30 environmental enclosure safety compliance.
4. Eco-Efficient Design: Designed in the Schneider Electric Green Premium range, ensuring full conformity with EU RoHS and REACh requirements, and offering 12,500 mechanical cycles of operation.

Industrial & Marine Applications

• Marine Main Switchboards: Main generator incoming circuit breakers and bus-tie isolation couplers on cargo vessels, container ships, tankers, and luxury cruise liners.
• Offshore Platforms: Power distribution protection in drilling rigs and Floating Production Storage and Offloading (FPSO) vessels.
• Industrial Processing Plants: Critical low-voltage motor control centers (MCC), manufacturing sub-stations, and high-fault current industrial power networks.
• Data Centers & Infrastructure: Backup generator emergency transfer systems and main building incoming breaker integration.

Frequently Asked Questions

What is the primary difference between a Masterpact NT16 H1 and H2 performance rating?

The H2 performance rating on the Masterpact NT16 designates a higher breaking capacity variant. While the H1 standard version typically interrupts up to 42 kA at 440V, the H2 model achieves a robust 50 kA ultimate breaking capacity at 440V AC, matching it perfectly with modern high-fault marine generator outputs.

Can this drawout breaker be retrofitted into an existing fixed-chassis mount?

No. A drawout circuit breaker requires a matching Masterpact NT drawout cradle/chassis guide frame. If you are replacing a fixed-mount breaker, you must either acquire the appropriate drawout cradle assembly or convert the plant configuration to accept the drawout assembly.

Are the internal MCH motor and XF/MN coils field-replaceable?

Yes. One of the main benefits of the Masterpact NT line is its modular internal auxiliary compartment. The front cover can be safely removed via four standard screws, enabling immediate field maintenance or voltage replacement of the MCH spring motor, XF closing coil, or MN undervoltage release coils without dismantling the primary frame.