Schneider Masterpact NW25H1 2500A 4P Drawout Breaker Frame (48306)

The Schneider Electric Masterpact NW25H1, catalogue reference 48306, is a 2500 A, 4-pole, drawout air circuit breaker frame with a 65 kA breaking capacity (performance level H1), supplied without a trip unit. It is a low-voltage power circuit breaker to IEC 60947-2, suitable for isolation, and is used as a main incomer, bus-tie or sub-main device in large LV switchboards. The matching Micrologic control unit, chassis and rear connections are ordered separately to complete the ACB.

Quick specs

Parts needed for a complete ACB

Reference 48306 is the breaker frame only. The following genuine Schneider parts complete a working 2500 A 4-pole drawout ACB, and we can supply them together as a matched set:

Applications and configuration

The Masterpact NW25H1 is designed for the main and sub-main protection of large low-voltage distribution switchboards, typically as an incomer or bus-coupler at 2500 A. As a drawout device it racks into a fixed NW chassis, allowing safe isolation and removal for maintenance without disturbing the switchboard wiring.

• Main incomer, bus-tie or large sub-main in commercial, industrial and infrastructure LV switchboards.
• Four-pole switching for full isolation of three phases plus neutral, including TN-S and generator changeover schemes.
• Supplied as a frame without a trip unit; add the Micrologic 2.0 E (48498) or another Micrologic control unit to set the protection functions.

Because this reference is drawout and without a control unit, confirm the chassis (48406), Micrologic unit (48498) and rear connections (48169 and 48174) before ordering. Our engineer can verify the full configuration against your existing switchboard.

Why buy from Electrical Junction

• Genuine Schneider Electric stock, supplied from our Dubai counter with a real walk-in location for buyers who want to verify high-value switchgear in person.
• We supply the complete matched set (frame, Micrologic, chassis and connections) so the ACB arrives ready to commission, checked by our engineer before dispatch.
• The Masterpact NW remains a current, genuine range for extending and maintaining existing NW installations, kept in stock at Dubai for fast supply.
• For Saudi Arabia and wider GCC projects, we prepare SASO/SABER conformity documents and help importers obtain the certificates needed to clear high-value switchgear through customs.

Frequently asked questions

Does the Masterpact NW25H1 (48306) include a trip unit?

No. Reference 48306 is supplied as a 4-pole drawout frame without a control (trip) unit. A Micrologic control unit must be ordered separately and matched to the protection functions your installation needs.

What do I need to build a complete Masterpact NW25H1 ACB?

The 48306 is the bare breaker frame. To assemble a complete, working drawout ACB you also need the Micrologic 2.0 E trip unit (48498), the 4-pole 2500 A drawout chassis (48406), and the top and bottom horizontal rear connections (48169 and 48174). We can supply all of these genuine Schneider parts together so the breaker arrives ready to commission.

What is the breaking capacity of the Masterpact NW25H1?

The NW25H1 has a rated ultimate breaking capacity (Icu) of 65 kA at 440 V AC, which corresponds to performance level H1, and a short-time withstand current (Icw) of 65 kA for 1 second, conforming to IEC 60947-2.

Is the Masterpact NW being replaced by the Masterpact MTZ?

No. The Masterpact NW is a current Schneider Electric range and reference 48306 has not been replaced. The Masterpact MTZ is a separate newer generation and is not a drop-in replacement in an existing NW cradle, so NW switchboards continue to be extended and maintained with genuine NW breakers.

What is the difference between drawout and fixed Masterpact NW?

A drawout (withdrawable) breaker racks in and out of a fixed chassis, so it can be isolated and removed for maintenance without disturbing the busbar and cable connections. A fixed breaker is permanently connected. Reference 48306 is the drawout version and needs a matching NW chassis such as 48406.

Which Micrologic trip unit do I need for the NW25H1?

It depends on the protection required: Micrologic 2.0 E (48498) provides overload and short-circuit (LI) protection with energy metering, 5.0 adds adjustable short-time (LSI), 6.0 adds earth-fault protection and 7.0 adds earth-leakage. Our engineer will match the correct Micrologic unit to your application.