PLM34120CU44A PowerPacT P MCCB Unit

Module Feature

PLM34120CU44A is Square D PowerPacT P heavy-duty molded case circuit breaker.

It adopts 3-pole structure, rated current 1200A, 100kA ultimate short-circuit breaking capacity at 480V AC. It is pre-assembled with Micrologic 6.0A trip unit, which supports adjustable overload, short-time delay, instantaneous and earth fault protection. The line side adopts lug terminal connection, load side with nut terminal design. It supports electrical operating mechanism and communication expansion module for SCADA remote monitoring. This series follows UL489 North American specification, widely stocked as maintenance spare for oil & gas, factory and data center 480V low voltage distribution cabinet.

Working principle

Built-in current transformers collect three-phase current signals and send data to Micrologic 6.0A trip unit.

Electronic protection unit executes multi-section selective protection logic. When overload, short circuit or earth fault is detected, it triggers trip release rapidly to separate main contacts and isolate faulty circuit. It stores operation counter, fault waveform and timestamp event records, and uploads status and fault information to upper monitoring system via communication module.

Onboard components

Main contact group, arc extinguishing chamber, CT sensor set, Micrologic 6.0A protection trip unit, spring operating mechanism, auxiliary contact block, alarm contact, front operation handle, status indicator window and reinforced insulated housing.

LED indicators

Front indicators show breaker ON, breaker OFF, fault trip status. Protection parameters and fault codes are displayed on the Micrologic trip unit panel.

Hardware self‑diagnosis

Micrologic 6.0A trip unit continuously monitors trip coil continuity, CT signal loss, internal power loss and hardware anomaly. Parameter configuration and fault log reading are completed by EcoStruxure Power Commission software.

Programming software

EcoStruxure Power Commission, used for protection curve setting, earth fault threshold, communication address and firmware upgrade.

Electrical & Process Parameters

Model:PLM34120CU44A Brand:Square D (Schneider Electric) Device type:PowerPacT P 1200A molded case circuit breaker Function:Overload, short circuit and earth fault selective protection for 480V three-phase low voltage power distribution circuit

Mechanical & Structure

Mounting:Switchgear cabinet fixed installation Protection class:IP30 front panel, IP20 terminal compartment Housing:Heavy-duty reinforced insulated MCCB housing

Environmental

Operating temperature:-10℃ ~ +55℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:UL489, CE Status:Original North American specification distribution spare

Installation

Isolate upstream power supply before replacement.

Check primary lug wiring and secondary control wiring, confirm 3-pole phase sequence, set protection parameters according to distribution design, test manual/electric closing, tripping and earth fault protection function after commissioning.

Interface

Primary lug terminal for line side, nut terminal for load side, secondary screw terminal block for auxiliary contact, trip coil and communication signal.

Diagnostic

Cannot close: Spring not charged, interlock protection active or closing coil failure. Earth fault false trip: CT polarity reversed, stray leakage current or improper earth threshold. Communication offline: Communication module fault, cable damage or station address conflict.

Product Brief

PLM34120CU44A circuit breaker, Square D PowerPacT P 1200A 3P 100kA@480V spare for North American standard low voltage main incoming cabinet replacement.