Schneider PGA36120 MCCB Unit

Module Feature

PGA36120 belongs to Schneider PowerPacT P series molded case circuit breaker.

It adopts compact molded insulation housing and supports I-Line busbar mounting structure. It is equipped with ET1.0I fixed electronic trip unit for long-time overload protection. It can be expanded with shunt trip, auxiliary switch and alarm switch accessories, and shares a unified accessory platform with other P-frame breakers. It is commonly deployed in low voltage main incoming, sub-feeder and bus tie protection circuits.

Working principle

The built-in electronic trip unit continuously monitors load current.

When current exceeds the preset overload threshold, the trip unit triggers the mechanical operating mechanism to open the main contacts and isolate the fault circuit. The internal arc chute extinguishes electric arc rapidly during breaking to prevent arc damage inside the breaker.

Onboard components

Main contact assembly, arc quenching chamber, electronic trip board, current sensing transformer, stored-energy operating mechanism, manual operating handle, auxiliary contact mounting cavity.

LED indicators

Not applicable.

Hardware self‑diagnosis

Diagnosis depends on supporting power monitoring accessory. It detects overload alarm, trip event and circuit abnormal status. Trip records can be uploaded via optional communication module.

Programming software

Schneider EcoStruxure Power Commissioning Tool, used for breaker parameter checking and energy monitoring configuration with matched accessories.

Electrical & Process Parameters

Model:PGA36120 Brand:Schneider Electric Device type:Molded case circuit breaker Function:Overload and short-circuit protection for low voltage power distribution circuits

Mechanical & Structure

Mounting:I-Line busbar plug-in installation Protection class:IP20 Housing:Glass fiber reinforced thermoset molded insulation housing

Environmental

Operating temperature:-25℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, IEC60947, UL489

Status:Original Schneider power distribution spare

Installation

Align the breaker with I-Line busbar and push firmly to lock.

Check contact engagement, mechanical trip function and auxiliary signal feedback before energizing.

Interface

I-Line busbar connection terminals, secondary control and auxiliary signal terminal block.

Diagnostic

Unintended tripping: Overload exceeding setting value, internal contact degradation or transient short circuit.

Failure to close: Mechanism locked by trip latch, missing spring energy or interlock signal active.

External overheating: Poor busbar contact or insufficient tightening torque.

Product Brief

Schneider PGA36120 molded case circuit breaker, 3-pole 1200A PowerPacT P I-Line MCCB spare for low voltage distribution panel replacement.